Unit Test — Unit test Answers

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21
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Studying the folding patterns of protein molecules can help microbiologists better understand cellular processes as well as some diseases, such as Alzheimer’s, that are caused by proteins that have misfolded. The folding of these complicated molecules can be simulated on computers, but it takes a lot of processor power and time for even expensive supercomputers to do this. A group of researchers at Stanford University developed software that can be used to distribute the processing of data to anyone who is willing to donate time on their idle personal computers. As a result, the researchers have been able to achieve protein-folding simulations that are far better than those other computing methods have done. Which statement best describes the work of these researchers?

A
The work is not scientific because the data are not processed in one location.
B
The work is not scientific because the simulations are not reproducible.
C
The researchers applied creativity to solve a problem in running an experiment.
D
The researchers used only well-established scientific techniques.
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Most scientists agree that saturated fats contribute to high levels of “bad” cholesterol in a person's blood, while monounsaturated fats and polyunsaturated fats lower this type of cholesterol in a person's blood. The table below shows data about fats in some common foods.Food (14 g)Saturated fat (g)Monounsaturated fat (g)Polyunsaturated fat (g)Canola oil1.08.93.9Margarine1.65.43.4Olive oil1.99.91.4Lard5.05.81.4Butter7.93.70.5Joyce and Linda are identical twins who are 50 years old and enjoy exercising daily. Joyce avoids eating any dairy or animal products and eats granola made with canola oil for breakfast. Linda prefers rich foods, and eats bacon, eggs, and buttered toast each morning. Which statement describes a logical inference that can be made from the provided information?

A
Butter has higher levels of saturated fats in it than canola oil.
B
Linda and Joyce both have high levels of “bad” cholesterol.
C
Butter contains a small amount of polyunsaturated fats.
D
Linda has a higher level of “bad” cholesterol than Joyce.
23

An experiment is performed to test the effect of three different types of water on the growth of a plant. The test is done by using tap water, distilled water, and carbonated water. Choose the statement below that describes the tap water in this experiment.

A
The tap water is a controlled variable for all plants.
B
The tap water is the control group for comparison.
C
Tap water is the only test condition that will cause changes in the dependent variable.
D
Tap water is one of the three test conditions of the independent variable, the type of water.
24

To test the effectiveness of a new nutrient supplement, one group of identical mice is given the supplement, and the other group is not given anything. Which is the most complete list of the parts of an experiment presented in this scenario?

A
independent variable, dependent variable
B
control group, experimental group, dependent variable
C
independent variable, control group, experimental group
D
control group, experimental group
25

Scientists once believed that Tyrannosaurus rex dragged its tail along the ground. Today, they know that T. rex did not drag its tail but held it aloft, above the ground. This change in scientific consensus happened because

A
scientists liked the idea that T. rex held its tail aloft better.
B
no one supported the idea that T. rex dragged its tail on the ground.
C
the idea that T. rex held its tail aloft is an emerging idea that replaced the old idea.
D
the idea that T. rex held its tail aloft was supported by the studies of many scientists.

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