BIO 120 Exam 1 Questions and Answers 100% Solved | Graded A+
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Course
BIO 120
Institution
BIO 120
BIO 120 Exam 1 Questions and Answers
100% Solved | Graded A+
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-cellsfrom-cells hypothesis. Whic...
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:
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.
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.
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