Biology Praxis
1. Which of the following characteristics of a material found on the bark
of a tree will most likely prove that the material is a living thing?
The material is green.
The material appears to reproduce on its own.
The material is composed primarily of carbon and hydrogen atoms.
The material absorbs heat in the presence of sunlight.: The material appears to
reproduce
on its own
2. Given the DNA sequence 5' ATGCCCTCA 3', which of the following is the
correct complementary sequence of messenger RNA?
3' U A C G A G U 5'
3' A C T C G T A 5'
5' A U G C U C A 3'
5' T A C G A G T 3': 3' U A C G A G U 5'
3. According to evolutionary theory, which of the following individuals
has the greatest Darwinian fitness?
A man who lives to be 70 years old, has no children, and remains very
, healthy until just before his death
A man who lives to be 50 years old, has 4 children and 16 grandchildren,
and is ill for five years before his death
A woman who lives to be 80 years old, has 6 children and 30
grandchildren, and is in poor health most of her life
A woman who lives to be 90 years old, has 1 child and no grandchildren,
and is ill for four years before her death: A woman who lives to be 80 years old, has 6
children and 30
grandchildren, and is in poor health most of her life
4. When caribou migrate, the weaker ones often become the prey of
wolves and other carnivores. If the vegetation that the caribou eat is
sparse for several consecutive years, which of the following will most
likely be true about the wolf population during that same period?
a. The wolf population will initially increase because of an increase
in the wolves' food availability.
b. The wolf population will initially decrease because the wolves compete
with the caribou for the same food.
c.The wolf population will initially decrease because the stronger caribou
begin to use the wolves as a food source.
,d. The wolf population will not change significantly; only the caribou
population will decrease.: a. The wolf population will initially increase because of an increase in the
wolves' food availability.
5. Which TWO of the following are scientific theories?
a. Energy can be neither created nor destroyed but can change in form.
b. Evolutionary adaptations arise by natural selection.
c. Water covers 71% of Earth's surface.
d. The number of species in an isolated island-like habitat is determined
by an equilibrium between the rates of immigration and extinction.: b.
Evolutionary adaptations arise by natural selection.
d. The number of species in an isolated island-like habitat is determined by an equilibrium between the
rates of immigration and extinction.
6. A diploid organism has the genotype Aa Bb Cc for three loci, each of
which is located on a different chromosome. A normal gamete
produced by this organism could have which of the following
genotypes?
a. Ab C
b. AB
c. AaB
, d. AC c: Ab C
7. Which of the following amino acids can contribute to the three-
dimensional structure of a protein by forming covalent bonds with an
identical amino acid in another part of the protein?:
8. The sciatic nerve from a frog was isolated and placed into a nerve
chamber. A recording of an action potential was measured when the
nerve was bathed in a solution that mimics the extracellular fluid
typically surrounding a cell, and the nerve was stimulated. The recording
is shown above. If the toxin TTX, a potent sodium-channel blocker, is
added to the bathing solution and the nerve is stimulated using a
stimulus of the same strength, what will be the most likely change in the
action potential?
The action potential will not occur, because depolarization will not occur.
b. The membrane will depolarize more quickly, and the action potential
will be of shorter duration.
c. The membrane will repolarize more slowly, and the action potential will
last longer.
d. Development of an action potential does not require sodium; therefore
the action potential will remain unchanged.: The action potential will not occur, because
1. Which of the following characteristics of a material found on the bark
of a tree will most likely prove that the material is a living thing?
The material is green.
The material appears to reproduce on its own.
The material is composed primarily of carbon and hydrogen atoms.
The material absorbs heat in the presence of sunlight.: The material appears to
reproduce
on its own
2. Given the DNA sequence 5' ATGCCCTCA 3', which of the following is the
correct complementary sequence of messenger RNA?
3' U A C G A G U 5'
3' A C T C G T A 5'
5' A U G C U C A 3'
5' T A C G A G T 3': 3' U A C G A G U 5'
3. According to evolutionary theory, which of the following individuals
has the greatest Darwinian fitness?
A man who lives to be 70 years old, has no children, and remains very
, healthy until just before his death
A man who lives to be 50 years old, has 4 children and 16 grandchildren,
and is ill for five years before his death
A woman who lives to be 80 years old, has 6 children and 30
grandchildren, and is in poor health most of her life
A woman who lives to be 90 years old, has 1 child and no grandchildren,
and is ill for four years before her death: A woman who lives to be 80 years old, has 6
children and 30
grandchildren, and is in poor health most of her life
4. When caribou migrate, the weaker ones often become the prey of
wolves and other carnivores. If the vegetation that the caribou eat is
sparse for several consecutive years, which of the following will most
likely be true about the wolf population during that same period?
a. The wolf population will initially increase because of an increase
in the wolves' food availability.
b. The wolf population will initially decrease because the wolves compete
with the caribou for the same food.
c.The wolf population will initially decrease because the stronger caribou
begin to use the wolves as a food source.
,d. The wolf population will not change significantly; only the caribou
population will decrease.: a. The wolf population will initially increase because of an increase in the
wolves' food availability.
5. Which TWO of the following are scientific theories?
a. Energy can be neither created nor destroyed but can change in form.
b. Evolutionary adaptations arise by natural selection.
c. Water covers 71% of Earth's surface.
d. The number of species in an isolated island-like habitat is determined
by an equilibrium between the rates of immigration and extinction.: b.
Evolutionary adaptations arise by natural selection.
d. The number of species in an isolated island-like habitat is determined by an equilibrium between the
rates of immigration and extinction.
6. A diploid organism has the genotype Aa Bb Cc for three loci, each of
which is located on a different chromosome. A normal gamete
produced by this organism could have which of the following
genotypes?
a. Ab C
b. AB
c. AaB
, d. AC c: Ab C
7. Which of the following amino acids can contribute to the three-
dimensional structure of a protein by forming covalent bonds with an
identical amino acid in another part of the protein?:
8. The sciatic nerve from a frog was isolated and placed into a nerve
chamber. A recording of an action potential was measured when the
nerve was bathed in a solution that mimics the extracellular fluid
typically surrounding a cell, and the nerve was stimulated. The recording
is shown above. If the toxin TTX, a potent sodium-channel blocker, is
added to the bathing solution and the nerve is stimulated using a
stimulus of the same strength, what will be the most likely change in the
action potential?
The action potential will not occur, because depolarization will not occur.
b. The membrane will depolarize more quickly, and the action potential
will be of shorter duration.
c. The membrane will repolarize more slowly, and the action potential will
last longer.
d. Development of an action potential does not require sodium; therefore
the action potential will remain unchanged.: The action potential will not occur, because
