Ap biology multiple choice questions - www.njctl.org PSI AP Biology Cell Cycle Multiple Choice Review – Cell Cycle Use the following options to answer questions #1-3: I. G 0 II. G 1 III. G 2 IV. S V. Mitosis VI. Cytokinesis 1. The cell cycle is divided into several distinct sub phases. Which sub phases occur during interphase? a. I, II, and III b. II, III, and IV c. I, II, III ...

 
AP BIO multiple choices resources. In short, I'm self-studying AP bio since our school is not offering this course. I've got some textbooks and studying guide/review sheets, the problem is since we do not offer this course at school, I have nowhere to get the multiple choices questions for practice (college board only release the free response .... Ey103 flight status

A. Both systems act very quickly to relay information to various parts of the body. B. Both systems send impulses directly to a specific part of the body as an impulse that targets specific cells. C. In both systems information can be received by various cells in different organs and in different parts of the body.Constructing a dam and irrigation system to control flooding. Building ponds in the areas of dry land to promote interbreeding between the separated populations. 20 of 20. Quiz yourself with questions and answers for AP Biology Multiple Choice Exam, so you can be ready for test day.Stucco is a popular choice for exterior wall finishes due to its durability, versatility, and attractive appearance. If you’re considering stucco for your home or building, one que...In today’s competitive real estate market, sellers have several options when it comes to listing their properties. One popular choice is using MLS listings, also known as Multiple ...Multiple Choice Review - Heredity Questions #1-3 refer to the following situation: In humans, detached earlobes (D) is dominant to attached earlobes (d). Alison and her father have ... www.njctl.org AP Biology Heredity Questions #13-14 refer to the following scenario: In the primula plant, flower color is the result of epistasis. The pigment ...Most multiple choice questions on the AP Biology exam look pretty similar. While there are a few stand-alone questions, most, if not all, of the questions will come in sets with some type of information such as a paragraph, science experiment, chart, or graph. If you want to know what multiple choice questions on the AP Biology exam …AP® Biology Multiple-Choice Review: 6 Tips 1. Know what the multiple-choice questions look like. The multiple-choice questions on the AP® Bio exam are probably different from those on other AP® exams you’ve taken. They involve a lot of reading and analyzing diagrams, data, and images.Free 2024 AP Biology multiple choice practice tests scored instantly online. Questions, answers and solutions to pass the ap biology test. The results of this experiment are summarized in the information below: Species 1: Average weight (grams)= 15 and Total Cubic Centimeters of Oxygen Consumed in 1 hour= 0.75. Species 2: Average weight (grams)= 11 and Total Cubic Centimeters of Oxygen Consumed in 1 hour= 0.55. Species 3: Average weight (grams)= 21 and Total Cubic Centimeters of ... AP Biology Ecology. Competitive exclusion is most likely to occur between two. (A) closely related species occupying different niches. (B) closely related species occupying the same niche. (C) related species occupying different habitats. (D) unrelated species occupying different niches. (E) populations of the same species.AP® Biology Multiple-Choice Review: 6 Tips 1. Know what the multiple-choice questions look like. The multiple-choice questions on the AP® Bio exam are probably different from those on other AP® exams you’ve taken. They involve a lot of reading and analyzing diagrams, data, and images.Directions: Questions 1 and 2 are long free-response questions that require about 25 minutes each to answer. Questions 3 through 6 are short free-response questions that require about 10 minutes each to answer. Read each question carefully and completely. Answers must be written out in paragraph form.The format of the AP® Biology exam is detailed in the table below: Section. Section I: Multiple Choice Questions. Section II: Free Response Questions. Number of Questions. 60 questions of both discrete questions and question sets. Part A: 2 long answer questions. Part B: 4 short answer questions. Exam Weighting.AP Biology Course and Exam Description. This is the core document for this course. It clearly lays out the course content and describes the exam and the AP Program in general. The CED was updated in the summer of 2020 to include scoring guidelines for the example questions. PDF.May 7, 2022 ... Join us for a live review of AP Biology with Tiffany Jones from AP Bio Penguins TEST DAY CHECKLIST: ...ASVAB Test: If you are interested in a military career, then you will need to take the ASVAB test. ASVAB Practice Tests has hundreds of free practice questions. AP Practice Exams is a free online directory of practice tests, notes, study guides, videos, and multiple choice questions. A long list of resources for each AP test.Each question is accompanied by an answer and explanation to enhance your understanding. 1. What is Biotechnology? a) Use of living systems to make products. b) Study of biodiversity. c) Study of geological processes. d) Application of physics in biology.AP® BIOLOGY 2013 SCORING GUIDELINES. Question 1 (continued) (e) Briefly propose a model that describes how environmental cues affect the behavior of the flies in the choice chamber. (1 point maximum) Stimulus Response. Input (possible integration) Output. 2013 The College Board.You’ve likely heard of savings bonds, but what exactly are they and how do they work? Join us as we answer these questions and more. We’ll give you the scoop on different types of ...When it comes to land ownership, the question of “who owns the land?” is not always a straightforward one. In many cases, there are multiple key players and stakeholders involved i...AP Bio Chapter 2 Multiple choice. 5.0 (2 reviews) Flashcards; Learn; Test; Match; Q-Chat; ... ap biology: chapter 3 test questions. 20 terms. katiebwhitham. Preview. AP Bio Chapter 2 Test. 61 terms. sims138. Preview. Identity Quiz Vocab. 18 terms. gwatson022. Preview. Terms in this set (30) About 25 of the 92 natural elements are known to be ...d. They are not inherited by any of the parents - mutations can not be passed down. e. None of the above. They are inherited through one parent - the mother. AP Biology Unit 5: Heredity Topics - Meiosis, Meiosis and Genetic Diversity, Mendelian Genetics, Non-Mendelian Genetics, Environmental Effects on Phenotype….AP Biology: Multiple Choice Questions June 4, 2021 / in AP Biology / by admin. The multiple-choice questions are numbered, but that does not mean you must answer the questions in the given order. In fact, it’s highly unlikely that the questions will be presented to you in a confidence-inspiring, point-building, time-saving order. There is ...The multiple choice questions are each worth one point. Although this scoring seems straightforward, it gets much more complicated: To find your final score, you multiply your multiple choice score by 1.03, your long-answer score by 1.5, and your short-answer score by 1.43. Sum these products to find your raw score for the AP Biology question ...16 of 16. Quiz yourself with questions and answers for AP Biology CH 8 - Photosynthesis - Test Questions, so you can be ready for test day. Explore quizzes and practice tests created by teachers and students or create one from your course material.A. May aid in the transport of materials from one side of the membrane to the other. B. Membrane proteins of adjacent cells may hook together in various kinds of junctions. C. May be an enzyme or series of enzymes involved in metabolic pathways. D. May be a membrane carbohydrate used for cell-to-cell recognition.AP Biology Unit 4: Cell Communication & Cell Cycle Practice Test (Multiple Choice) 30 terms. gracekang718. Preview. AP Biology - Meiosis. 32 terms. Sophie_Lan07. Preview. Bio. 11 terms. k_baho27. Preview. Ap Bio Unit 5: MCQ progress check. 24 terms. TheJovian67. Preview. AP Biology | Unit 4 MCQ Practice Questions. 24 terms. …Cyclic-AMP binds to the CAP protein. The protein changes shape. Space is increased by the binding of tryptophan. Helix-turn-helix motifs are enabled to bind to the DNA. The assembly of transcription factors on a promoter begins some 25 nucleotides upstream where it binds to a start _______________ sequence.Question 7. Although animal cells lack cell walls, they have a complex network of glycoproteins that provide structure and strength to the cell, referred to as: A. Desmosomes. B. Extracellular matrix. C. Intermediate filaments. D.29. In humans pointed eyebrows are dominant to smooth eyebrows and widow's peak (downward pointed frontal hairline) is dominant to continuous hairline. What phenotypic ratio would you expect in the offspring from a cross between an individual heterozygous for both genes and an individual homozygous recessive for both genes? A)500+ Exam-Like Questions. Realistic questions mimic the style and difficulty of the AP Biology exam. Organized in the same way as the AP Biology course, so you learn as you go, all year long. Prepares you to excel on quizzes, unit tests, and the AP exam.AP Biology Scoring Materials for Digital Exam Practice . Please note: the digital exam practice resource was developed for students to complete technology checks, experience the digital platform, and practice answering exam questions, including each type of multiple-choice and free-response question they will encounter on exam day.Multiple choice: Circle the answer(s) that best completes the sentences 1. Which of the following is Not true about the cell membranes? a. Cell membranes allow ALL substances to pass through easily b. It is selectively permeable so only certain molecules can pass through it. c. Cell membranes surround all animal, plant, and bacterial cells. d.Question 4. How do enzymes change the speed of chemical reactions in cells? A. They increase the heat in the cell, and therefore speed up the reaction by allowing reactants to attain the transition state more often. B. Enzymes speed up reactions by changing the amount of free energy available in the cell for reactions.AP Biology Multiple Choice. The 60 multiple-choice questions test your grasp of the fundamentals of biology and your ability to apply biological concepts to help solve problems. AP Biology Free Response Questions . The free response section consists of two long-form free-response questions, both of which require data analysis, and four short ...When it comes to deep cleaning carpets, upholstery, and other surfaces, steam machines have become a popular choice for many homeowners and businesses. However, one question that o...Question 7. Although animal cells lack cell walls, they have a complex network of glycoproteins that provide structure and strength to the cell, referred to as: A. Desmosomes. B. Extracellular matrix. C. Intermediate filaments. D.Apr 30, 2023 ... ... test in one day https://www.youtube.com/watch?v=14KJErOuKUY Last ... AP® Bio Exam Free Response Section ... AP® Biology Q&A 2024: Exam Questions.Donating your body to science is a generous decision that can contribute to medical research and education. However, it’s natural to have questions about what happens after you mak...The AP Biology Exam assesses student understanding of the science practices and learning objectives outlined in the course framework. The exam is 3 hours long and includes 60 multiple-choice questions and 6 free-response questions. A four-function, scientific, or graphing calculator is allowed on both sections of the exam.Directions: Questions 1 and 2 are long free-response questions that require about 25 minutes each to answer. Questions 3 through 6 are short free-response questions that require about 10 minutes each to answer. Read each question carefully and completely. Answers must be written out in paragraph form.Multiple choice: Circle the answer(s) that best completes the sentences 1. Which of the following is Not true about the cell membranes? a. Cell membranes allow ALL substances to pass through easily b. It is selectively permeable so only certain molecules can pass through it. c. Cell membranes surround all animal, plant, and bacterial cells. d.The format of the AP® Biology exam is detailed in the table below: Section. Section I: Multiple Choice Questions. Section II: Free Response Questions. Number of Questions. 60 questions of both discrete questions and question sets. Part A: 2 long answer questions. Part B: 4 short answer questions. Exam Weighting.additional ATP is created from glucose. excess NADPH is reused in the light reaction. Score =. Correct answers: Quiz over photosynthesis that focuses on how oxygen is split, providing and electron that eventually results in the formation of ATP. This is an advanced quiz intended for students in AP Biology.AP BIology PRACTICE EXAM section I: multiple-choice questions worth 60 percent of the total score. Each of the questions or incomplete statements below is followed by five …A) The binding of the substrate depends on the shape of the active site. B) Some enzymes change their structure when activators bind to the enzyme. C) A competitive inhibitor can outcompete the substrate for the active site. D) The binding of the substrate changes the shape of the enzymeʹs active site.Chapter 13 Multiple Choice Review. 70 terms. Shahbaz_Gul. Preview. PCC Human and Cell Biology Chapter 5-6-7 Test. 77 terms ... Teacher 25 terms. mrcoby. Preview. Unit 4: Cell Communication & Cell Cycle Ap Biology Quiz. 35 terms. Jimena_0503. Preview. Biology Chapter 6 Vocabulary . 36 terms. samiyah_heags. Preview. Terms for Mitosis, …AP® BIOLOGY 2013 SCORING GUIDELINES. Question 1 (continued) (e) Briefly propose a model that describes how environmental cues affect the behavior of the flies in the choice chamber. (1 point maximum) Stimulus Response. Input (possible integration) Output. 2013 The College Board.Multiple Choice: Answers to Review Questions: Feedback Help Center: Biology, 6/e. ... , Washington University. The Science of Biology. Multiple Choice Quiz. Please answer all questions. 1. In the study of science: A) deductive reasoning may be used, but inductive reasoning is preferred: B)AP Biology Unit 4: Cell Communication & Cell Cycle Practice Test (Multiple Choice) 30 terms. gracekang718. Preview. AP Biology - Meiosis. 32 terms. Sophie_Lan07. Preview. Bio. 11 terms. k_baho27. Preview. Ap Bio Unit 5: MCQ progress check. 24 terms. TheJovian67. Preview. AP Biology | Unit 4 MCQ Practice Questions. 24 terms. …Study with Quizlet and memorize flashcards containing terms like Both Darwin's and Lamarck's ideas regarding evolution suggest which of the following? a. all species were fixed at the time of creation b. acquired physical characteristics can be inherited c. the giraffe's long neck is the result of artificial selection d. the main mechanism of evolution is natural …Every AP subject has standardized sections on the exam. They usually include multiple choice and free response questions. Each section is worth some number of points based on 1) the number of questions and 2) sometimes a scoring rubric. Each section also has a different weight on your final score.AP Biology Ecology. Competitive exclusion is most likely to occur between two. (A) closely related species occupying different niches. (B) closely related species occupying the same niche. (C) related species occupying different habitats. (D) unrelated species occupying different niches. (E) populations of the same species. Question 4. How do enzymes change the speed of chemical reactions in cells? A. They increase the heat in the cell, and therefore speed up the reaction by allowing reactants to attain the transition state more often. B. Enzymes speed up reactions by changing the amount of free energy available in the cell for reactions. Apr 17, 2023 ... In this video, we'll unpack sample multiple-choice questions. Download questions here: https://tinyurl.com/tv42as3d Stay motivated and keep ...Like other AP tests, AP Biology has two parts: a multiple-choice section and a free-response section, each of which is worth 50% of your overall score. These sections are then divided further into different types of questions. ... It consists of 60 multiple-choice questions and is one hour and 30 minutes long. Each question contains four answer ...www.njctl.org PSI AP Biology Cell Cycle Multiple Choice Review – Cell Cycle Use the following options to answer questions #1-3: I. G 0 II. G 1 III. G 2 IV. S V. Mitosis VI. Cytokinesis 1. The cell cycle is divided into several distinct sub phases. Which sub phases occur during interphase? a. I, II, and III b. II, III, and IV c. I, II, III ...Name_____ Date_____ Period_____ Biology I, Ms. Desfossé MACROMOLECULES PRACTICE TEST MULTIPLE CHOICE 1. The molecule below is a a. carbohydrate b. lipid c. steroid d. A and C e. B and C 2. The molecule below is a polymer of glucose monomers. The molecule below is a. Cellulose b. Starch c. Maltose d. Glycogen e. Chitin 3.www.njctl.org PSI AP Biology Midterm Review MULTIPLE CHOICE MIDTERM REVIEW Units 1-5 1. One of the largest steps in the evolution of life is the development of eukaryotic cells from ... www.njctl.org PSI AP Biology Midterm Review Questions #11-12 refer to the following information: Vegetables, such as carrots and potatoes, store energy in the ...Section I of the AP Biology Exam consists of 60 multiple choice questions that have an exam weighting of 50%. You will have 90 minutes to answer the 60 questions. Additionally, a four-function, scientific, or graphing calculator is allowed on both sections of the exam. All the multiple choice questions will appear either as individual questions ...Terms in this set (32) Allele. Any of the alternative versions of a gene that produce distinguishable phenotypic effects. Average Heterozygosity. The percent, on average, of a population's loci that are heterozygous in members of the population. Balancing Selection. Natural selection that maintains two or more phenotypic forms in a population.Question 1. Which property of water allows it to move upward from the roots of a tree to its leaves? Question 2. There are several emergent properties of water that contribute its … AP® BIOLOGY 2013 SCORING GUIDELINES. Question 1 (continued) (e) Briefly propose a model that describes how environmental cues affect the behavior of the flies in the choice chamber. (1 point maximum) Stimulus Response. Input (possible integration) Output. 2013 The College Board. gracekang718. AP Biology Unit 5: Heredity Topics - Meiosis, Meiosis and Genetic Diversity, Mendelian Genetics, Non-Mendelian Genetics, Environmental Effects on Phenotype, Chromosomal Inheritance Directions - For each question, choose the best answer (unless otherwise stated) Test Period - You have 22 minutes 30 seconds to answer 30 questions.Section I of the AP Biology Exam consists of 60 multiple choice questions that have an exam weighting of 50%. You will have 90 minutes to answer the 60 questions. Additionally, a four-function, scientific, or graphing calculator is allowed on both sections of the exam. All the multiple choice questions will appear either as individual questions ...AP®︎/College Biology. 10 units · 54 skills. Unit 1. Chemistry of life. Unit 2. Cell structure and function. ... Unit 5. Heredity. Unit 6. Gene expression and regulation. Unit 7. Natural selection. Unit 8. Ecology. Unit 9. Worked examples of AP®︎ Biology free response questions. Unit 10. AP®︎ Biology standards mappings. Course ...Which biomolecule is a main source of quick energy? 3. Multiple Choice. Which biomolecule is found in fats, oils, and waxes and is a source of long-term energy? Already have an account? Macromolecules Quiz- AP Biology quiz for 9th grade students. In this video, we’ll unpack sample multiple-choice individual questions.Download questions here: https://tinyurl.com/mny4jx49Stay motivated and keep preparin... May 16, 2023 ... You're Doing It WRONG: Strategies for AP Exam Multiple Choice ... AP® Biology Q&A 2024: Exam Questions ... How to answer the short FRQs on the AP® ...There’s three steps to preparing for the AP Exam : study, practice and review. Study : Start by studying the general concepts from every unit of the AP exam. Look over any material and tests from class this year, and go through these AP Biology study guides. AP Practice : Acing the exam is all about being able to recall the information ...www.njctl.org AP Biology Ecology Multiple Choice Review – Ecology 1. Which level of biological organization includes all others? a. Population b. Organism c. Community d. Ecosystem Questions #2-5 refer to the following information: Nitrogen is the most limiting mineral for plant growth. Although the atmosphere is 79% nitrogen, plantsTo allow students to show their mastery of laboratory science skills and knowledge, some questions in the multiple-choice section and one of the four essay questions may reflect the laboratory work and the objective associated with the AP biology laboratory exercises. The multiple-choice section of the examination counts for 60% and the free ...This AP Biology Review Guide is a BEAST, but it walks through the entire Course & Exam Description (CED) with I can statements, questions, and practice multiple choice/free response for each unit. Plus, new this year - explanations for all of the multiple choice questions. CLICK THE IMAGE ----->AP Bio Chapter 2 Multiple choice. 5.0 (2 reviews) Flashcards; Learn; Test; Match; Q-Chat; ... ap biology: chapter 3 test questions. 20 terms. katiebwhitham. Preview. AP Bio Chapter 2 Test. 61 terms. sims138. Preview. Identity Quiz Vocab. 18 terms. gwatson022. Preview. Terms in this set (30) About 25 of the 92 natural elements are known to be ...ec02230. AP Biology Unit 1: Chemistry of Life Topics - Structure of Water and Hydrogen Bonding, Elements of Life, Introduction to Biological Macromolecules, Properties of Biological Macromolecules, Structure and Function of Biological Macromolecules, Nucleic Acids Directions - For each question, choose the best answer (unless otherwise stated ...The AP Biology Exam is 3 hours long and is divided into two sections: Section I (multiple-choice questions) and Section II (free-response questions). The AP biology exam assesses content from each of four big ideas for the course:Q-Chat. AP Biology Unit 3: Cellular Energetics Topics - Enzyme Structure, Enzyme Catalysis, Environmental Impacts on Enzyme Function, Cellular Energy, Photosynthesis, Cellular Respiration, Fitness Directions - For each question, choose the best answer (unless otherwise stated) Test Period - You have 30 minutes to answer 40 questions.The multiple-choice section includes individual, single questions as well as sets of questions that refer to the same diagram or data presentation. Questions will test your ability to: Explain biological concepts, processes, and models; Analyze diagrams, flow charts, and other visual representations; Use the scientific method AP Biology - Evolution Unit Practice Exam. Multiple Choice. Identify the choice that best completes the statement or answers the question. ____ 1) Catastrophism, meaning the regular occurrence of geological or meteorological disturbances (catastrophes), was Cuvier's attempt to explain the existence of . A) evolution. B) the fossil record. AP® Biology. Looking for an AP® Biology score calculator? Click here for this and more tips for your test! Review the processes and principles behind living organisms and their ecosystems through exam prep practice questions on scientific inquiry and models in Albert's AP Biology prep course. Download free-response questions from past AP Biology exams, along with scoring guidelines, sample responses from exam takers, and scoring distributions.Following is a list of all multiple choice question types you will encounter on the Section I of AP Biology exam: Text-based questions. Short-form text. Long-form text. Diagram …The multiple choice questions are each worth one point. Although this scoring seems straightforward, it gets much more complicated: To find your final score, you multiply your multiple choice score by 1.03, your long-answer score by 1.5, and your short-answer score by 1.43. Sum these products to find your raw score for the AP Biology question ...

AP Biology Date _____ 1 of 8 Developed by Kim B. Foglia • www.ExploreBiology.com • ©2010 REVIEW UNIT 10: ECOLOGY — SAMPLE QUESTIONS A. Sample Multiple Choice Questions Complete the multiple choice questions to review this unit. 1. All of the following are density-dependent factors that limit animal populations EXCEPT (90:08). Em nails east brunswick

ap biology multiple choice questions

Google has removed yet another batch of awful Android apps from the Google Play Store for breaking the company’s terms of service. The roundup includes 101 apps belonging to a sing...A. Both systems act very quickly to relay information to various parts of the body. B. Both systems send impulses directly to a specific part of the body as an impulse that targets specific cells. C. In both systems information can be received by various cells in different organs and in different parts of the body.Daughter, parental. During the replication of a dna molecule replication can only take place along a template strand from. 3 prime to 5 prime. Study with Quizlet and memorize flashcards containing terms like The two types of purines In a DNA molecule are, Two types of pyrimidines in a DNA molecule are, In a DNA or RNA molecule a p______ S ...Find thousands of challenging AP Biology practice questions organized by topic and with answers and explanations. Choose from various resources, including official College Board tests, textbook quizzes, flashcards, and more.AP Biology explores the fundamental scientific principles, theories, and mechanisms that control the functions of living organisms and biological systems. Click through our free AP Biology Study Guides and AP Biology flashcards below: AP Biology Multiple Choice Practice Problems. AP Biology AP Free Response Practice Problems. Days. 05. Hours. …May 16, 2023 ... You're Doing It WRONG: Strategies for AP Exam Multiple Choice ... AP® Biology Q&A 2024: Exam Questions ... How to answer the short FRQs on the AP® ...The format of the AP® Biology exam is detailed in the table below: Section. Section I: Multiple Choice Questions. Section II: Free Response Questions. Number of Questions. 60 questions of both discrete questions and question sets. Part A: 2 long answer questions. Part B: 4 short answer questions. Exam Weighting.Donating your body to science is a generous decision that can contribute to medical research and education. However, it’s natural to have questions about what happens after you mak...A scientist, who is studying photosynthesis, places a plant in an environment where the oxygen atoms in carbon dioxide are labeled with radioactive 18O but the oxygen atoms in water have nonradioactive 18O. Based on this scenario, predict which product of photosynthesis will contain radioactive 18O. glucose.The exam for child development associates includes multiple-choice questions covering six competency areas established by the child development associate national accrediting progr...» Do AP Biology Practice Tests » Download AP Biology Practice Tests » Best AP Biology Books; More AP Tests. AP Biology Test 1; AP Biology Test 2; AP Biology Test 3; AP …AP Bio Unit 4 Multiple Choice. The centromere is a region in which. a) chromatids remain attached to one another until anaphase. b) metaphase chromosomes become aligned at the metaphase plate. c) chromosomes are grouped during telophase. d) the nucleus is located prior to mitosis. e) new spindle microtubules form at either end.A. none of the traits obeyed the law of segregation. B. the diploid number of chromosomes in the pea plants was 7. C. all of the genes controlling the traits were located on the same chromosome. D. all of the genes controlling the traits behaved as …Question 8. When an adult vervet monkey sees an eagle, it gives a specific alarm call (a short-double-syllabled cough). They are able to distinguish among eagle species and only sound the alarm for the two species that eat vervets. Infant vervet monkeys, however, give very undiscriminating alarm calls.AP Biology Chapter 7 Multiple Choice: Photosynthesis - All Questions. If photosynthesizing green algae are provided with CO₂ synthesized with heavy oxygen (¹⁸O), later analysis will show that all but one of the following compounds produced by the algae contain the ¹⁸O label. That one is. A) 3-phosphoglycerate. B) glyceraldehyde 3 ....

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