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AP Bio Exam with correct answers
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AP Bio Exam with correct answersA certain protein molecule consists of 4 subunits: each is a folded polypeptide chain with an alpha
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helix. Considering this info, which structureal levels of organization must the molecule have? -
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ANSWER: ➡ Primary, secondary, tertiary, & quaternary
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In living organisms, lipids function mainly as - ANSWER: ➡ Sources of stored energy & components
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of cellular membranes
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Which of the following statements concerning unsaturated fats is correct? - ANSWER: ➡ They have
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double bonds in the carbon chains of their fatty acids
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When water evaporated, breaks occur in what bonds - ANSWER: ➡ Hydrogen bonds (the doted line
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on the picture)
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How many water molecules are used up (or produced) when a polypeptide chain is converted by
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hydrolysis reactions into 13 amino acids? - ANSWER: ➡ 12 are used up
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The typical energy storage form of carbohydrates in animals is - ANSWER: ➡ Glycogen
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Although the water is colder to swim in on the West Coast than on the East Coast of the US, the temp
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of water is relatively constant in both locations, why? - ANSWER: ➡ It takes a large amount of heat
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energy to raise the temp of water
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DNA & RNA are nucleic acids that can store biological info based on the sequence of their nucleotide
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monomers. Figure 1 shows a short segment of each of the two types of nucleic acids. Which of the
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following best describes a structural difference between DNA & RNA? - ANSWER: ➡ The backbone
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of DNA contains deoxyribos whereas the backbone of RNA contains ribose
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In the following diagram of water molecules, the bond labeled x from O to H is a(n) - ANSWER: ➡
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Polar covalent bond
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, How are dietary fats & human sex hormones similar - ANSWER: ➡ Both are insoluble lipids
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Synthesized from a cholesterol precursor - ANSWER: ➡ Steroids w w w w w w ww w
Includes glycogen, chitin, cellulose, & glucose - ANSWER: ➡ Carbohydrates
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Used for insulation & buoyancy in marine Arctic mammals - ANSWER: ➡ Triglycerides
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Includes hemoglobin, collagen, & insulin - ANSWER: ➡ Proteins
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The following table shows the relative percentages of elements in a certain biological molecule.
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Which best describes the biological molecules (chart includes C=38%, N=17%, P=10%, O=31%,
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H=4%) - ANSWER: ➡ This molecules is a nucleic acid
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Which of the following processes is the reverse of dehydration synthesis? - ANSWER: ➡ Hydrolysis
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Which of the following best depicts the tertiary structures of the two proteins in water? - ANSWER:
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➡ Both original & mutated protein are in a ball (folded)
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A chemical has the formula C18H32O16. It is what? - ANSWER: ➡ A carbohydrate
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In the early 1950s, a team of researchers led by Erwin Chargaff, conducted a series of experiments
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related to deciphering the chemical composition of DNA. In one experiment, Chargaff's team
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examined samples of DNA from different species of sea urchins. The results of this experiment are
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summarized in the table below.Which of the following results from the experiment is most consistent
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with the base-pairing rules of DNA? - ANSWER: ➡ The percentage of adenine is roughly equal to the
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percentage of thymine nucleotides across all species in the experiment (in the row, all numbers are
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1.02)
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The isotopes of carbon, which are an important tool in biological research, differ from each other in -
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ANSWER: ➡ Number of neutrons
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