The variable that is manipulated in an experiment is typically called the:
a) independent variable
b) dependent variable
c) control
d) causal variable Correct Answer: a
This is defined as a proposed explanation for an observation
a) experiment
b) conclusion
c) prediction
d) hypothesis C...
the variable that is manipulated in an experiment is typically called the
this is defined as a proposed explanation for an observation
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JMU Bio 140 Lab Final
The variable that is manipulated in an experiment is typically called the:
a) independent variable
b) dependent variable
c) control
d) causal variable Correct Answer: a
This is defined as a proposed explanation for an observation
a) experiment
b) conclusion
c) prediction
d) hypothesis Correct Answer: d
Type of study that tests a hypothesis but does not manipulate any variables
a) quantitative
b) non-experimental
c) experimental
d) descriptive Correct Answer: b
You want to test the hypothesis that marigolds repel salamanders. Which of the
following studies DOES NOT test this hypothesis.
a) Find 30 flowerbeds of equal size that have different numbers of marigolds in
them. Count the number of salamanders in each flowerbed and see if the number
of salamanders in each bed is related to the number of marigolds in each bed
b) Find 30 flower beds on campus and compare the total number of salamanders
in flowerbeds with marigolds vs. beds without marigolds
c) Find 20 identical flowerbeds with salamanders in each. Plant marigolds in 10 of
the flowerbeds and keep the other 10 flowerbeds as controls. After a month
count the number of salamanders remaining in each type of flowerbed
d) Observe how salamanders react/move when they are close to marigolds vs.
other species of flowers in the flowerbed
e) Find 30 flower beds on campus and count the total number of salamanders in
each flowerbed Correct Answer: e
, A scientist wishes to determine the effect of a digestive enzyme on starch
digestion (starch is broken down into glucose). The experimental setup is to mix
the enzyme with starch in a test tube, stop the reaction after a known period of
time, and then measure the amount of glucose produced.
Which of the following is the correct experimental control?
a) maintaining a constant temperature during the experiment
b) An identical setup but replacing the enzyme with an equal volume of the same
enzyme AFTER it has been inactivated.
c) Repeating the experiment three more times to control for any variation in your
first experimental trial
d) An identical setup but replacing the enzyme with a different digestive enzyme
Correct Answer: d
You want to test the hypothesis that marigolds repel salamanders. You design
several studies to test this hypothesis. Which of the following studies would
demonstrate that marigolds CAUSE salamanders to move out of flowerbeds?
a) Observe how salamanders react/move when they are close to marigolds vs.
other species of flowers in the flowerbed
b) Find 30 flower beds on campus and compare the total number of salamanders
in flowerbeds with marigolds vs. beds without marigolds
c) Find 20 identical flowerbeds with salamanders in each. Plant marigolds in 10 of
the flowerbeds and keep the other 10 flowerbeds as controls. After a month
count the number of salamanders remaining in each type of flowerbed
d) Find 30 flowerbeds of equal size that have different numbers of marigolds in
them. Count the number of salamanders in each flowerbed and see if the number
of salamanders in each bed is related to the number of marigolds in each bed
Correct Answer: c
Which of the following are correct statements about hypotheses (check each)?
a) hypotheses are the same as predictions/expectations
b) hypotheses have explanatory power
c) hypotheses are guesses
d) hypotheses are usually based on background knowledge and prior observations
Correct Answer: b and d
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