Bio 100 Exam 1 UPDATED Exam
Questions and CORRECT Answers
Eagles and other top predators are most severely affected by pesticides like DDT because they -
CORRECT ANSWER - Consume prey in which pesticides are concentrated.
Why are food chains restricted to five or fewer trophic levels? - CORRECT ANSWER -
All of these choices are correct:
- Because insufficient energy is available to support a large enough breeding population at higher
trophic levels than these.
- The loss of usable energy at each trophic level means that many more individuals being eaten
are needed to support a smaller number of creatures doing the eating. - Energy transfer is
relatively inefficient.
- The total energy stores is less at each level as you move up the food chain.
Which reproductive process will result in the greatest genetic variation within a population? -
CORRECT ANSWER - Sexual reproduction
If you spend a summer in the White Mountains of eastern Arizona observing the mating behavior
of Mexican gray wolves and then come up with a tentative explanation for their behavior which
you test with an experiment, what kind of science are you performing? - CORRECT
ANSWER - Hypothesis-based science
Which of the following statements about life's levels of organization is false? - CORRECT
ANSWER - Tissues exist within cells which exist within organs.
A controlled experiment was conducted by American biologist A.D. Hasler to see if salmon
return to their home stream (where they were hatched) using their sight. Hasler first captured the
salmon in either the East Fork or Issaquah Rivers, blindfolded some of them and left others non-
blindfolded. He then released both groups below their home streams and then recaptured them as
shown in the figure below. Hasler found that blindfolded salmon were as successful as non-
blindfolded salmon at returning to their home stream.
, What can be concluded from the results of this experiment? - CORRECT ANSWER -
Salmon do not use their sight to navigate back to their home streams.
Biologists study life at many different levels of organization from the tiny atom to the immense
biosphere. Which level of organization is represented by all the species living in the White
Mountains of eastern Arizona? - CORRECT ANSWER - Community
Eating a marshmallow straight from the package and burning it over a campfire both release
energy. Which method of energy release would yield the greatest amount of usable energy and
why? - CORRECT ANSWER - Eating it straight from the package because the energy is
released slower and some of it is captured in ATP molecules.
A larval tiger beetle species on the Willcox Playa constructs a unique "turret" over its tunnel
opening. One hypothesis is that the turret functions to protect the larva from flies and predatory
wasps (these types of predators are called parasitoids) that lay their eggs on the tiger beetle
larvae to be later consumed by the emerging fly and wasp larvae. An investigator wanted to
retest previous experiments done several years before. She looked in the field at 100 larvae
whose turret had been removed two weeks prior and 100 larvae whose turret had not been
touched. Below are the results from these most recent field studies.
64 of the 100 larvae with a turret removed had parasitoids
14 of the 100 larvae with an intact turret had parasitoids
From these tests alone, what can we conclude? - CORRECT ANSWER - The presence of
the turrets is likely an adaptation against parasitoids.
The overall purpose of the light-independent reactions (aka Calvin Cycle) of photosynthesis is to
- CORRECT ANSWER - Convert carbon dioxide into carbohydrates.
Which of these processes removes carbon dioxide from the atmosphere? - CORRECT
ANSWER - Photosynthesis
Organelles are present in: - CORRECT ANSWER - Animal and plant cells
Questions and CORRECT Answers
Eagles and other top predators are most severely affected by pesticides like DDT because they -
CORRECT ANSWER - Consume prey in which pesticides are concentrated.
Why are food chains restricted to five or fewer trophic levels? - CORRECT ANSWER -
All of these choices are correct:
- Because insufficient energy is available to support a large enough breeding population at higher
trophic levels than these.
- The loss of usable energy at each trophic level means that many more individuals being eaten
are needed to support a smaller number of creatures doing the eating. - Energy transfer is
relatively inefficient.
- The total energy stores is less at each level as you move up the food chain.
Which reproductive process will result in the greatest genetic variation within a population? -
CORRECT ANSWER - Sexual reproduction
If you spend a summer in the White Mountains of eastern Arizona observing the mating behavior
of Mexican gray wolves and then come up with a tentative explanation for their behavior which
you test with an experiment, what kind of science are you performing? - CORRECT
ANSWER - Hypothesis-based science
Which of the following statements about life's levels of organization is false? - CORRECT
ANSWER - Tissues exist within cells which exist within organs.
A controlled experiment was conducted by American biologist A.D. Hasler to see if salmon
return to their home stream (where they were hatched) using their sight. Hasler first captured the
salmon in either the East Fork or Issaquah Rivers, blindfolded some of them and left others non-
blindfolded. He then released both groups below their home streams and then recaptured them as
shown in the figure below. Hasler found that blindfolded salmon were as successful as non-
blindfolded salmon at returning to their home stream.
, What can be concluded from the results of this experiment? - CORRECT ANSWER -
Salmon do not use their sight to navigate back to their home streams.
Biologists study life at many different levels of organization from the tiny atom to the immense
biosphere. Which level of organization is represented by all the species living in the White
Mountains of eastern Arizona? - CORRECT ANSWER - Community
Eating a marshmallow straight from the package and burning it over a campfire both release
energy. Which method of energy release would yield the greatest amount of usable energy and
why? - CORRECT ANSWER - Eating it straight from the package because the energy is
released slower and some of it is captured in ATP molecules.
A larval tiger beetle species on the Willcox Playa constructs a unique "turret" over its tunnel
opening. One hypothesis is that the turret functions to protect the larva from flies and predatory
wasps (these types of predators are called parasitoids) that lay their eggs on the tiger beetle
larvae to be later consumed by the emerging fly and wasp larvae. An investigator wanted to
retest previous experiments done several years before. She looked in the field at 100 larvae
whose turret had been removed two weeks prior and 100 larvae whose turret had not been
touched. Below are the results from these most recent field studies.
64 of the 100 larvae with a turret removed had parasitoids
14 of the 100 larvae with an intact turret had parasitoids
From these tests alone, what can we conclude? - CORRECT ANSWER - The presence of
the turrets is likely an adaptation against parasitoids.
The overall purpose of the light-independent reactions (aka Calvin Cycle) of photosynthesis is to
- CORRECT ANSWER - Convert carbon dioxide into carbohydrates.
Which of these processes removes carbon dioxide from the atmosphere? - CORRECT
ANSWER - Photosynthesis
Organelles are present in: - CORRECT ANSWER - Animal and plant cells
