Cell Homeostasis — Unit test Answers

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Organisms contain different levels of organization within their bodies. Arachnoidiscus ehrenbergi, pictured below, is a single-celled organism that is part of the group of algae known as diatoms. Photo by Gordon T. Taylor, courtesy of the NOAAWhich level of organization is seen in both Arachnoidiscus ehrenbergi and the human stomach?

Question illustration
A
cell
B
tissue
C
organ
D
organ system
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Which best defines homeostasis?

A
modifying the external environment
B
maintaining a stable internal environment
C
controlling what enters and exits the cell
D
movement of materials into the cell
23

Which organelle makes the proteins that are needed by the cell?

A
cell membrane
B
Golgi apparatus
C
ribosomes
D
nucleus
24

What would most likely happen if an error occurred when RNA was receiving coding information?

A
Proteins would be formed incorrectly.
B
DNA would form incorrectly.
C
RNA could not form a correct blueprint.
D
The incorrect amino acid would form.
25

A scientist is examining the role of an element found in fats and carbohydrates of living things. This element makes up 65% of human body mass. Which statement describes the element he is studying?

A
He is studying oxygen, which can also be found in proteins.
B
He is studying oxygen, which is the most abundant element in the atmosphere.
C
He is studying nitrogen, which can also be found in proteins.
D
He is studying nitrogen, which is the most abundant element in the atmosphere.

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