Answers24 - 25 CR - Biology B 0411KBThe Nervous System

The Nervous System — Unit test Answers

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Once the body has begun shivering, what happens to make it stop shivering?

A
When body temperature returns to normal, the respiratory system sends a message to the skeletal system to stop shivering.
B
When body temperature returns to normal, the nervous system sends a message to the muscular system to stop shivering.
C
When body temperature is below normal, the nervous system sends a message to the skeletal system to stop shivering.
D
When body temperature is below normal, the respiratory system sends a message to the muscular system to stop shivering.
2
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The nervous system is a part of the autonomic system that conserves energy by returning the body to a normal activity level through a lowered heart rate and blood pressure.

Answer not available
3

The role of the cell membrane is most like the job of which person?

A
a firefighter who evacuates people from a burning building
B
a police officer who allows select people to enter and leave a crime scene
C
a bus driver who drives the express route from the suburb to downtown
D
a teacher who keeps students in the classroom during an exam
4

Which statement correctly compares and contrasts the three stages of cellular respiration that occur in the presence of oxygen?

A
Each stage occurs in the mitochondria, but only the final stage produces ATP.
B
Each stage produces ATP, but only the third stage occurs in the mitochondria.
C
Each stage produces ATP, but only the first stage occurs in the cytoplasm.
D
Each stage occurs in the cytoplasm, but only the final stage produces ATP.
5

Which injury would likely cause the body to permanently lose the ability to perform simple reflexes?

A
damage to the nerve cells in the spinal cord
B
a muscle tear in the leg
C
the death of a single neuron in the body
D
harm to a nerve in the skin
6

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
7

Which of the following describes a negative feedback loop?

A
When the heart rate is too high, the body sends hormones that continually increase the heart rate higher.
B
When a pregnant woman is in labor, the body sends hormones that increase the intensity of contractions, which then increases the secretion of the same hormones.
C
When blood sugar is too low, the body sends hormones that raise blood sugar until it reaches a typical level and hormone secretion slows.
D
When a person is jogging, the body sends hormones that continually decrease the rate of oxygen supply to the legs.
8

During which step of cellular respiration is the most ATP produced?

A
Krebs cycle
B
glycolysis
C
photosynthesis
D
electron transport chain
9

Which statement about enzymes is true?

A
An enzyme functions to decrease the rate of a chemical reaction.
B
Enzymes are proteins that function as catalysts in nonliving things.
C
Each enzyme can catalyze many different biochemical reactions.
D
Enzymes and substrates fit together like a lock and key.
10

Heather presented to her class a report about the pancreas. Which statement in Heather’s report was not accurate?

A
The pancreas has both endocrine and exocrine functions.
B
The pancreas regulates blood sugar concentration.
C
The pancreas triggers the development of secondary sex characteristics.
D
The pancreas helps digest fat, protein, and carbohydrates.
11

Neurons and neuroglia work together to form nervous tissue, which is part of the nervous system. Which describes neurons and neuroglia?

A
They are specialized organs that form an organ system.
B
They are organs that form tissue.
C
They are specialized tissues that form an organ system.
D
They are cells that form tissue.
12

Which will increase the rate of a chemical reaction?

A
adding a catalyst
B
decreasing the pressure
C
decreasing the temperature
D
removing a catalyst
13

Which type of molecule that can be found in living things lacks carbon atoms?

A
protein
B
carbohydrate
C
fat
D
water
14

How has the study of mitosis affected scientists’ knowledge of cancer?

A
It led to a study of how to induce cancer cells to divide more rapidly.
B
It led to an understanding of how cancer cells divide so rapidly.
C
It led to the development of contact-inhibition regulators.
D
It led to the discovery of how to prevent cancer cells from dividing.
15

Consider this animal cell.Which organelles are labeled G?

Question illustration
A
centrioles
B
lysosomes
C
ribosomes
D
mitochondria
16

Leukopenia is a condition characterized by a decrease in white blood cells. What effect does leukopenia have on the body's ability to fight infection?

A
Leukopenia increases the body's ability to fight infection.
B
Leukopenia decreases the body's ability to fight infection.
C
Leukopenia has no effect on the body's ability to fight infection.
D
Leukopenia increases the body's ability to fight infection at certain times and decreases it at other times.
17

Which organelle breaks down sugar molecules that supply energy to the cell?

A
Golgi apparatus
B
nucleus
C
endoplasmic reticulum
D
mitochondrion
18

It is crucial that the process of mitosis is error free. This is because otherwise healthy cells can

A
grow into giant super cells.
B
undergo meiosis.
C
become cancer cells.
D
produce two identical cells.
19

What does the immune system protect the body against?

A
changes of the internal body temperature
B
changes in the temperature of environment
C
changes caused by harmful pathogens
D
changes in the pH of the blood
20

A scientist discovers a cell that has chloroplasts, cytoplasm, DNA, and a cell membrane. Which statement best describes how the cell could be classified?

A
The cell is prokaryotic because it has DNA.
B
The cell is prokaryotic because it has cytoplasm.
C
The cell is eukaryotic because it has a cell membrane.
D
The cell is eukaryotic because it has chloroplasts.

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