AP Bio Practice Exam 1 QUESTIONS AND ANSWERS
(VERIFIED 100% CORRECT)
A particular gene has two alleles, a dominant
allele A and a recessive allele a. The frequency
of allele A is 0.55. If the population is in
Hardy-Weinberg equilibrium with respect to the
gene, then what is the expected frequency of
genotype Aa ? - ANSWER 0.495
Based on the codon chart above, which of the
following amino acid changes is most likely
found in the mutated protein? - ANSWER Glu → Val
Figure 1 shows the inheritance of a particular
genetic condition in three generations of one
family. Which of the following best explains the
observed pattern of inheritance? - ANSWER The condition is passed from mothers to
offspring via a mitochondrial gene
Oncogenes are genes that can cause tumor
formation as a result of a particular mutation.
Which of the following potential therapies would
be most effective at preventing the
expression of an oncogene? - ANSWER Introducing a chemical that binds to
transcription factors associated with the
oncogene's promoter
Ultraviolet (UV) radiation can damage DNA by
breaking weak bonds. Which of the following
best explains how this occurs? - ANSWER UV radiation disrupts the double helix
structure by breaking the hydrogen bonds
between the nitrogenous base pairs
Based on the data in the table, which of the following lizard species are most closely
related? - ANSWER Species E and species D
Figure 1 shows a model of the endocrine
signaling pathway that regulates ovulation.
, Which of the following observations would
provide evidence of a positive feedback
mechanism in this system? - ANSWER Estrogen from the ovaries stimulates the
hypothalamus and anterior pituitary to
secrete more GnRH, LH, and FSH
In which of the following tubes did the greatest
reduction of DCPIP occur after 60 minutes? - ANSWER Tube 2
Which of the following claims is best supported
by the experimental results? - ANSWER Light is required for the electron transport
chain to transfer electrons
Which of the following best explains how
DCMU affected the reaction? - ANSWER DCMU acts as an inhibitor to the
movement of electrons within the light
reaction of photosynthesis
Which of the following best justifies the use of
tube 2 as a control treatment? - ANSWER It was a positive control for measuring the
effect of DCMU on the reaction
A scientist designed an experiment to test an
artificial membrane that mimics the phospholipid
bilayer of a cell.
The scientist built a tube that was divided by an
artificial membrane and filled with distilled water.
The scientist put a known amount of a protein
into the water on one side of the membrane.
After some time, the scientist measured the
concentration of the protein on either side of the
membrane but found that there had been no
change.
Which of the following experimental changes
would allow the scientist to observe transport of
a solute across the artificial membrane? - ANSWER Use a small, nonpolar solute
instead of a
protein
(VERIFIED 100% CORRECT)
A particular gene has two alleles, a dominant
allele A and a recessive allele a. The frequency
of allele A is 0.55. If the population is in
Hardy-Weinberg equilibrium with respect to the
gene, then what is the expected frequency of
genotype Aa ? - ANSWER 0.495
Based on the codon chart above, which of the
following amino acid changes is most likely
found in the mutated protein? - ANSWER Glu → Val
Figure 1 shows the inheritance of a particular
genetic condition in three generations of one
family. Which of the following best explains the
observed pattern of inheritance? - ANSWER The condition is passed from mothers to
offspring via a mitochondrial gene
Oncogenes are genes that can cause tumor
formation as a result of a particular mutation.
Which of the following potential therapies would
be most effective at preventing the
expression of an oncogene? - ANSWER Introducing a chemical that binds to
transcription factors associated with the
oncogene's promoter
Ultraviolet (UV) radiation can damage DNA by
breaking weak bonds. Which of the following
best explains how this occurs? - ANSWER UV radiation disrupts the double helix
structure by breaking the hydrogen bonds
between the nitrogenous base pairs
Based on the data in the table, which of the following lizard species are most closely
related? - ANSWER Species E and species D
Figure 1 shows a model of the endocrine
signaling pathway that regulates ovulation.
, Which of the following observations would
provide evidence of a positive feedback
mechanism in this system? - ANSWER Estrogen from the ovaries stimulates the
hypothalamus and anterior pituitary to
secrete more GnRH, LH, and FSH
In which of the following tubes did the greatest
reduction of DCPIP occur after 60 minutes? - ANSWER Tube 2
Which of the following claims is best supported
by the experimental results? - ANSWER Light is required for the electron transport
chain to transfer electrons
Which of the following best explains how
DCMU affected the reaction? - ANSWER DCMU acts as an inhibitor to the
movement of electrons within the light
reaction of photosynthesis
Which of the following best justifies the use of
tube 2 as a control treatment? - ANSWER It was a positive control for measuring the
effect of DCMU on the reaction
A scientist designed an experiment to test an
artificial membrane that mimics the phospholipid
bilayer of a cell.
The scientist built a tube that was divided by an
artificial membrane and filled with distilled water.
The scientist put a known amount of a protein
into the water on one side of the membrane.
After some time, the scientist measured the
concentration of the protein on either side of the
membrane but found that there had been no
change.
Which of the following experimental changes
would allow the scientist to observe transport of
a solute across the artificial membrane? - ANSWER Use a small, nonpolar solute
instead of a
protein
