Answers2025-2026_MDCPS_2000315_Biology_1_B-CRUnit Test

Unit Test — Unit test Answers

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1
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Asbestosis is a lung disease that is caused by inhaling asbestos, a mineral that was once used as insulation and fire retardant in building materials. Which best describes abestosis?

A
It disproves spontaneous generation.
B
It offers supporting evidence regarding miasma.
C
Its transmission cannot be studied using the germ theory of disease.
D
Its transmission can be studied using the germ theory of disease.
2
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What would cause antibodies to attack the cells of the body?

A
The cells support bacterial growth.
B
The cells are worn out and need to be replaced.
C
The antibodies mistakenly identify the cells as foreign material.
D
The red blood cells are malfunctioning.
3

Which best describes the testes?

A
They produce hormones and sperm.
B
They are the male copulatory organ.
C
They give sperm nourishment and motility.
D
They are the pouch-like skin that protects the scrotum.
4

Which best describes the role of immunosuppressants in transplant surgeries?

A
to increase antibody production to fight off more pathogens
B
to suppress the immune system to allow pathogens to build immunity
C
to decrease antibody production to reduce the attacks on the new organ
D
to allow for recognition of antigens to determine compatibility
5

Fred is studying his notes from anatomy class. One list in his notes describes features of a CNS structure. anterior horns and posterior hornsgray matter inside, white matter outsidehippocampuscentral canalFred thinks this list contains an error. Which best describes the error?

A
Most items are features in the brain, but the gray and white matter locations correspond to the spinal cord.
B
Most items are features in the brain, but the horns are in the spinal cord.
C
Most items are features in the spinal cord, but the central canal is in the brain.
D
Most items are features in the spinal cord, but the hippocampus is in the brain.
6

Barry was on an antibiotic, but after he took all of it, he had a rash and the doctor prescribed him an antihistamine. Which most likely describes what happened to Barry?

A
He had a viral infection, but then developed an allergy to the antibiotic.
B
He had a parasite infection, but then it developed into a bacterial infection.
C
He had a fungal infection, but then it developed into a viral infection.
D
He had a bacterial infection, but then developed an allergy to the antibiotic.
7

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.
8

Lice are small wingless insects that make their home in human hair and feed on very small amounts of blood from the scalp. They can be transferred from person to person and through the use of contaminated items such as brushes or pillows. Which type of disease is lice infestation?

A
communicable
B
noncommunicable
C
genetic
D
lifestyle
9

Meningitis is a disease that is characterized by swelling of the meninges that puts pressure on the brain. Which is least likely to be a symptom of this disease?

A
severe headache
B
swollen ankles
C
sensitivity to light
D
confusion
10

Which blood component makes up 41% of the blood’s volume?

A
plasma
B
red blood cells
C
platelets
D
white blood cells
11

Veins take blood back to the heart. Which gas would be most abundant in a vein that takes blood from muscle cells in the arm back to the heart?

A
carbon dioxide
B
oxygen
C
nitrogen
D
hydrogen
12

The graph shows the changing levels of hormones during menstruation and ovulation. In general, what happens to the hormone levels between days 21 and 27, just prior to menstruation if the egg was not fertilized?

Question illustration
A
Hormone levels generally decrease.
B
Hormone levels generally rise.
C
Hormone levels remain the same.
D
Hormone levels go in two different directions.
13

In the 1950s, the structure of DNA was discovered by using models and x-ray chromatography. Currently, science has used advanced technology to completely map out the genes in a human’s body. What would be the best advantage of using this information?

A
gene therapy to correct defective genes that cause diseases
B
gene therapy to remove bacteria from the soil
C
more communicable diseases
D
fewer communicable diseases
14

Which of the following describes the epididymis?

A
a tube that transports sperm to the urethra
B
a vesicle that produces fluid and gives sperm nourishment and motility
C
a gland that contributes fluid to semen
D
a tube that stores and develops sperm cells from the testes
15

Which product of respiration is considered waste material and leaves the alveoli?

A
oxygen
B
water
C
carbon dioxide
D
carbon monoxide
16

Sound can be heard when air passes over a respiratory structure that is located between the pharynx and the trachea.Which structure is responsible for the voice?

A
the nose
B
the larynx
C
the lung
D
the alveoli
17

Which is an immune response?

A
The iris of the eye narrows when the eyes are exposed to bright light.
B
Langerhans cells transport harmful substances to white blood cells.
C
Muscles under the skin contract rapidly to adjust the body's internal temperature.
D
T cells signal B cells to adjust the pH of the blood.
18

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
19

Which causes a drop in female hormone levels?

A
the onset of the menstrual flow
B
the release of an egg from the ovary
C
the thickening of the uterine wall
D
the failure of an egg to be fertilized
20

Jacob recently suffered a serious head injury in a car accident. He now has trouble remembering his life before the injury. What part of Jacob's brain may have been injured in the accident?

A
hypothalamus
B
cerebellum
C
brain stem
D
hippocampus

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