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BIO 120 Exam 1 Practice Questions and Answers (100% Pass)
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©PREP4EXAMS@2024 [REAL-EXAM-DUMPS] Monday, July 29, 2024 12:15 PMBIO 120 Exam 1 Practice Questions and Answers (100% Pass)
Pasteur's experiment provided conclusive evidence to reject the spontaneous
generation hypothesis, which states that cells arise from nonliving material. As a
consequence, his results supported the all-cells-from-cells hypothesis. Which element
of Pasteur's experimental design was most important and why? - ✔️✔️His two treatments
differed only in the shape of the flask, resulting in exposure of only one of the
treatments to preexisting cells.
Correct. Because he was testing whether exposure to preexisting cells is required to
produce new cells, it was essential that the only difference between treatments was the
factor being tested.
In Pasteur's experiment, the purpose of the swan neck on the flask was to:
provide a fertile environment for cells to grow.
allow the experimenter to boil the medium to sterilize it.
kill cells from the air before they reach the growth medium.
trap cells from the air before they reached the growth medium. - ✔️✔️trap cells from the
air before they reached the growth medium.
Correct. This prevented living cells from the outside from reaching the sterilized growth
medium.
Pasteur's results showed that:
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,©PREP4EXAMS@2024 [REAL-EXAM-DUMPS] Monday, July 29, 2024 12:15 PM
When growth medium is not contaminated by pre-existing cells, cells still grow there.
When growth medium is sterilized by boiling, it remains sterile even if new cells are
introduced.
When growth medium is not contaminated by pre-existing cells, the growth medium
remains sterile.
With enough time, any sterile environment will become contaminated with cells. -
✔️✔️When growth medium is not contaminated by pre-existing cells, the growth medium
remains sterile.
Correct. This finding disproved the theory of spontaneous generation
Which of the following statements is true about the testing of scientific hypotheses?
Hypotheses about biological questions can be tested without collecting data.
Hypotheses must be tested by carrying out experiments.
Hypotheses must be tested by making observations or measurements in a natural
environment.
Hypotheses may be tested by a combination of observation, measurement, and
experimentation. - ✔️✔️Hypotheses may be tested by a combination of observation,
measurement, and experimentation.
Correct. These are all valid methods of testing hypotheses.
Could both the food competition hypothesis and the sexual competition hypothesis
explain why giraffes have long necks? Why or why not?
Yes. Long necks could be advantageous for more than one reason.
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,©PREP4EXAMS@2024 [REAL-EXAM-DUMPS] Monday, July 29, 2024 12:15 PM
No. In science, only one hypothesis can be correct.
No. Observations have shown that the food competition hypothesis cannot be correct.
Yes. All giraffes have been shown to feed at the highest possible height and fight for
mates. - ✔️✔️Yes. Long necks could be advantageous for more than one reason.
What is selected, and why?
Check all that apply.
Natural selection acts on species.
Natural selection occurs when heritable variation in certain traits leads to improved
success in food competitions.
Natural selection occurs when heritable variation in certain traits leads to improved
success in reproduction.
Natural selection acts on individuals.
Natural selection acts on populations.
Natural selection is carried out by man. - ✔️✔️Natural selection occurs when heritable
variation in certain traits leads to improved success in reproduction.
Natural selection acts on individuals.
Explain why researchers formulate a null hypothesis in addition to a hypothesis when
designing an experimental study.
A null hypothesis includes a characteristic of experimental conditions.
A null hypothesis includes a characteristic of control group.
It's not necessary to formulate a null hypothesis.
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A null hypothesis specifies what a researcher should observe when the hypothesis
being tested isn't correct. - ✔️✔️A null hypothesis specifies what a researcher should
observe when the hypothesis being tested isn't correct.
In areas of the world where HIV infection rates are high, are human populations
evolving? Explain your logic.
Yes. The heritable traits that confer resistance to HIV should increase over time.
No. HIV infection rates would not affect human evolution.
Yes. The heritable traits that confer resistance to HIV should decrease over time.
No. The heritable traits that confer resistance to HIV should decrease over time -
✔️✔️Yes. The heritable traits that confer resistance to HIV should increase over time.
In biology, to what does the term fitness refer?
A trait that increases the ability of an individual to produce viable offspring in a
particular environment.
An individual's ability to survive and reproduce.
An individual's ability to adjust and change to function in new circumstances.
Health and well-being. - ✔️✔️An individual's ability to survive and reproduce.
What did Linnaeus's system of naming organisms ensure?
Two different organisms have the same genus and species name if they are closely
related.
The genus name is the same for closely related species.
The species name is the same for each organism in a genus.
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