BIOL 1001 WEEK 5 EXAM
Question 1
2 out of 2 points
Which of the following describes natural selection?
Correct
d.
Answer: A population of mammals varies in the length of their legs, water levels
rise, and the habitat becomes swampy. The individuals with shorter
legs are better able to swim to food, and the population evolves to
become shorter-legged.
Question 2
3 out of 3 points
As natural selection acts on a population, the amount of variation in the population
should:
Correct
b.
Answer: Decrea
se
Question 3
3 out of 3 points
Which of the following is not a way in which the theory of evolution has been supported?
Correct
e.
Answer: None of the
above.
Question 4
3 out of 3 points
In 1980, only 1% to 5% of all Staphylococcus aureus isolates were MRSA strains. Now
60% to 70% of S. aureus isolates are MRSA strains. This is an example of:
Correct
a.
Answer: Directional selection of
, bacteria
Question 5
3 out of 3 points
In what way is artificial selection different from natural selection?
Correct
e.
Answer: In artificial selection, human preference is the selecting force; in natural
selection, environmental conditions are the selecting force.
Question 6
3 out of 3 points
The phrase “survival of the fittest” is somewhat misleading because it implies that:
Correct
a.
Answer: The best possible organism will
evolve
Question 7
3 out of 3 points
A key prediction/implication of evolutionary theory is that:
Correct
d.
Answer: The frequency of alleles in a population changes over time in response
to the environment
Question 8
2 out of 2 points
Which individuals have the greatest fitness in an area where malaria is common?
Correct
e.
Answer: Individuals heterozygous for the normal and sickle cell
anemia alleles
Question 9
2 out of 2 points
Your friend was diagnosed with strep throat 2 months ago. She was treated with
antibiotics for 10 days, but 2 weeks after treatment, the symptoms returned. She was
given a different antibiotic, and her symptoms again initially improved but then got
worse. What is happening? Choose the best answer.
Correct
c.
Answer: Your friend was originally infected with bacteria that are resistant to at
least two antibiotics.
Question 10
2 out of 2 points
A biologist has been studying two populations of trout in Montana for the last 25
years, when the two populations were established from one common population. In
the southern population, the fish now have a slightly different mouth shape. But the
northern population hasn’t changed from the original type. The new shape works well
in catching the type of prey common in the habitat of the southern population. Which
explanation is the most likely explanation of the gene differences in the two
Question 1
2 out of 2 points
Which of the following describes natural selection?
Correct
d.
Answer: A population of mammals varies in the length of their legs, water levels
rise, and the habitat becomes swampy. The individuals with shorter
legs are better able to swim to food, and the population evolves to
become shorter-legged.
Question 2
3 out of 3 points
As natural selection acts on a population, the amount of variation in the population
should:
Correct
b.
Answer: Decrea
se
Question 3
3 out of 3 points
Which of the following is not a way in which the theory of evolution has been supported?
Correct
e.
Answer: None of the
above.
Question 4
3 out of 3 points
In 1980, only 1% to 5% of all Staphylococcus aureus isolates were MRSA strains. Now
60% to 70% of S. aureus isolates are MRSA strains. This is an example of:
Correct
a.
Answer: Directional selection of
, bacteria
Question 5
3 out of 3 points
In what way is artificial selection different from natural selection?
Correct
e.
Answer: In artificial selection, human preference is the selecting force; in natural
selection, environmental conditions are the selecting force.
Question 6
3 out of 3 points
The phrase “survival of the fittest” is somewhat misleading because it implies that:
Correct
a.
Answer: The best possible organism will
evolve
Question 7
3 out of 3 points
A key prediction/implication of evolutionary theory is that:
Correct
d.
Answer: The frequency of alleles in a population changes over time in response
to the environment
Question 8
2 out of 2 points
Which individuals have the greatest fitness in an area where malaria is common?
Correct
e.
Answer: Individuals heterozygous for the normal and sickle cell
anemia alleles
Question 9
2 out of 2 points
Your friend was diagnosed with strep throat 2 months ago. She was treated with
antibiotics for 10 days, but 2 weeks after treatment, the symptoms returned. She was
given a different antibiotic, and her symptoms again initially improved but then got
worse. What is happening? Choose the best answer.
Correct
c.
Answer: Your friend was originally infected with bacteria that are resistant to at
least two antibiotics.
Question 10
2 out of 2 points
A biologist has been studying two populations of trout in Montana for the last 25
years, when the two populations were established from one common population. In
the southern population, the fish now have a slightly different mouth shape. But the
northern population hasn’t changed from the original type. The new shape works well
in catching the type of prey common in the habitat of the southern population. Which
explanation is the most likely explanation of the gene differences in the two
