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AP Biology Exam FRQ's (Unit 1)

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AP Biology Exam FRQ's (Unit 1) Describe the role of carbon in biological systems. Carbon is used to build biological macromolecules such as carbohydrates, proteins, nucleic acids, and lipids. (Unit 1) Explain how, when the membranes are fused, the polar parts of the phospholipids from one ce...

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  • May 7, 2024
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  • 2023/2024
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AP Biology Exam FRQ's
(Unit 1) Describe the role of carbon in biological systems.
Carbon is used to build biological macromolecules such as carbohydrates, proteins, nucleic acids, and
lipids.


(Unit 1) Explain how, when the membranes are fused, the polar parts of the phospholipids from one
cell will interact with the phospholipids from the other cell and how the nonpolar parts of the
phospholipids from one cell will interact with the phospholipids from the other cell.
When the membranes are fused, the polar parts of the phospholipids (hydrophilic head) from one cell
to the other dissolves in water and forming hydrogen bonds with the water. The non polar parts of
the phospholipids (hydrophobic tail) from one cell to the other avoids water. They create a lipid
bilayer where the hydrophobic tails are between the hydrophilic heads. When this layer is formed the
heads are exposed to water while the tails only interact with other tails not the water.


(Unit 1) Make a claim about the most immediate effect on the fused B-cancer cells if the fused cells
are transferred to a growth medium that lacks a source of nitrogen.
The denature of the B-cancer cells would be the most immediate effect if the fused cells are
transferred to a growth medium that lacks a source of nitrogen. The cells will either die OR be unable
to synthesize DNA and RNA/nucleic acids/nucleotides and amino.



(Unit 1) Provide reasoning with evidence based on the composition of biological macromolecules to
support your claim.
Nitrogen is a part of the base component in the biological macromolecules (nucleic acids (DNA, RNA,
or nucleotides) and amino acids (polypeptides, or proteins)) meaning that if there is a lack of it the B-
cancer cells would not be able to properly function or exist due to it missing and important
component to its structure.


Identify the process used to form the covalent peptide bonds that join amino acids into a polypeptide.
2 amino acids were joined together into a polypeptide by hydrolysis, which is in its most basic
description, the loss of a hydrogen molecule.


We have an expert-written solution to this problem!
The change in the amino acid sequence illustrated in Figure 1 caused a change in the shape of
Receptor X. Based on the R groups of the original and substituted amino acids, explain why Receptor
X changed shape.
Based on the R groups of the original and substituted amino acids, two amino acids with charged or
ionic or hydrophilic R-groups were replaced by two amino acids with uncharged or nonpolar or
hydrophobic R-groups.


Using the template below that represents the four levels of protein structure, place an X on each level
that is expected to be altered as a result of the amino acid substitutions shown in Figure 1.
The response indicates primary and quaternary structure. Since at the lowest level it is the sequence
of amino acids that determines the protein and at the highest level its the shape that determines the
function.


Explain how the amino acid substitution shown in Figure 1 is most likely to affect the function of
Receptor X.

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