AP BIO MIDTERM (UNITS 1-4 TEST & PROGRESS
CHECK [PC] ) UPDATED ACTUAL QUESTIONS AND
CORRECT ANSWERS
Question:
1. [1PC] Which feature of model 1 best illustrates how
biological information is coded in a DNA molecule?
A
The 3' and 5' labels at the ends of each strand
B
The labeling of the hydrogen bonds between base pairs
C
The lines connecting sugars and phosphate groups that
represent covalent bonds
D
The linear sequence of the base pairs
Answer:
D
The linear sequence of the base pairs
Question:
2. [1PC] Figure 1 represents a segment of DNA . Radiation
can damage the nucleotides in a DNA molecule. To repair
some types of damage, a single nucleotide can be
removed from a molecule and replaced with an
undamaged nucleotide. Which of the four labeled bonds
in Figure 1 could be broken to remove and replace the
cytosine nucleotide without affecting the biological
information coded in the DNA molecule?
A
Bond X only
B
Bond W only
C
Bonds Y and Z at the same time
D
Bonds W and Z at the same time
Answer:
C
Bonds Y and Z at the same time
,Question:
3. [1PC] A student wants to modify model 1 so that it
represents an RNA double helix instead of a DNA double
helix. Of the following possible changes, which would be
most effective in making model 1 look more like RNA than
DNA?
Responses
A
Changing the sequence of the base pairs
B
Changing the deoxyriboses to riboses by adding −OH
groups
C
Changing the shapes of the nitrogenous bases to match
those shown in model 2
D
Changing the sugar-phosphate backbone to a ribbon, as
shown in model 3
Answer:
B
Changing the deoxyriboses to riboses by adding −OH groups
,Question:
4. [1PC] Different polysaccharides are used by plants for
energy storage and structural support. The molecular
structures for two common polysaccharides are shown in
Figure 1. Starch is used by plants for energy storage, and
cellulose provides structural support for cell walls. The
monomer used to construct both molecules is glucose.
Based on Figure 1, which of the following best compares
the atomic structures of starch and cellulose?
Responses
A
Starch is composed of carbon, hydrogen, and oxygen,
while cellulose also contains nitrogen.
B
Starch and cellulose are composed of repeating glucose
monomers; however, in cellulose every other glucose
monomer is rotated 180 degrees.
C
Starch is composed of monomers that each have a
CH2OH group, while cellulose only has a CH2OH group
on every other monomer.
D
Starch and cellulose are composed of identical
monomers and therefore have identical structures.
Answer:
B
Starch and cellulose are composed of repeating glucose monomers; however, in
cellulose every other glucose monomer is rotated 180 degrees.
, Question:
5. [1PC] Which of the following statements best describes
the different functions of starch and cellulose in plants?
Responses
A
The differences in the assembly and organization of the
monomers of these two polymers result in different
chemical properties.
B
Since starch and cellulose are composed of identical
monomers, the cellular environment where they are
located controls their function.
C
The monomers of cellulose are connected by covalent
bonds, making it idea for structural support.
D
The monomers of starch are connected by ionic bonds,
making it ideal for energy storage for plants.
Answer:
A
The differences in the assembly and organization of the monomers of these two
polymers result in different chemical properties.
CHECK [PC] ) UPDATED ACTUAL QUESTIONS AND
CORRECT ANSWERS
Question:
1. [1PC] Which feature of model 1 best illustrates how
biological information is coded in a DNA molecule?
A
The 3' and 5' labels at the ends of each strand
B
The labeling of the hydrogen bonds between base pairs
C
The lines connecting sugars and phosphate groups that
represent covalent bonds
D
The linear sequence of the base pairs
Answer:
D
The linear sequence of the base pairs
Question:
2. [1PC] Figure 1 represents a segment of DNA . Radiation
can damage the nucleotides in a DNA molecule. To repair
some types of damage, a single nucleotide can be
removed from a molecule and replaced with an
undamaged nucleotide. Which of the four labeled bonds
in Figure 1 could be broken to remove and replace the
cytosine nucleotide without affecting the biological
information coded in the DNA molecule?
A
Bond X only
B
Bond W only
C
Bonds Y and Z at the same time
D
Bonds W and Z at the same time
Answer:
C
Bonds Y and Z at the same time
,Question:
3. [1PC] A student wants to modify model 1 so that it
represents an RNA double helix instead of a DNA double
helix. Of the following possible changes, which would be
most effective in making model 1 look more like RNA than
DNA?
Responses
A
Changing the sequence of the base pairs
B
Changing the deoxyriboses to riboses by adding −OH
groups
C
Changing the shapes of the nitrogenous bases to match
those shown in model 2
D
Changing the sugar-phosphate backbone to a ribbon, as
shown in model 3
Answer:
B
Changing the deoxyriboses to riboses by adding −OH groups
,Question:
4. [1PC] Different polysaccharides are used by plants for
energy storage and structural support. The molecular
structures for two common polysaccharides are shown in
Figure 1. Starch is used by plants for energy storage, and
cellulose provides structural support for cell walls. The
monomer used to construct both molecules is glucose.
Based on Figure 1, which of the following best compares
the atomic structures of starch and cellulose?
Responses
A
Starch is composed of carbon, hydrogen, and oxygen,
while cellulose also contains nitrogen.
B
Starch and cellulose are composed of repeating glucose
monomers; however, in cellulose every other glucose
monomer is rotated 180 degrees.
C
Starch is composed of monomers that each have a
CH2OH group, while cellulose only has a CH2OH group
on every other monomer.
D
Starch and cellulose are composed of identical
monomers and therefore have identical structures.
Answer:
B
Starch and cellulose are composed of repeating glucose monomers; however, in
cellulose every other glucose monomer is rotated 180 degrees.
, Question:
5. [1PC] Which of the following statements best describes
the different functions of starch and cellulose in plants?
Responses
A
The differences in the assembly and organization of the
monomers of these two polymers result in different
chemical properties.
B
Since starch and cellulose are composed of identical
monomers, the cellular environment where they are
located controls their function.
C
The monomers of cellulose are connected by covalent
bonds, making it idea for structural support.
D
The monomers of starch are connected by ionic bonds,
making it ideal for energy storage for plants.
Answer:
A
The differences in the assembly and organization of the monomers of these two
polymers result in different chemical properties.
