AnswersTX-Biology B-CRUnit Test

Unit Test — Unit test Answers

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Which of the following is NOT a type of white blood cell involved in the internal nonspecific immune response?

A
Phagocyte
B
Interferon
C
Monocyte
D
Natural killer cell
E
Neutrophil
22
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Which virus has a structure that includes an outer lipid bilayer that is studded with proteins?

A
papilloma virus
B
rabies virus
C
influenza virus
D
bacteriophage virus
23

What is the difference between B-cell lymphocytes and T-cell lymphocytes?

A
B cells regulate blood pH, and T cells regulate body temperature.
B
B cells are produced in the thymus, and T cells are produced in the bone marrow.
C
B cells engulf bacteria, and T cells carry bacteria to the lymph nodes.
D
B cells produce antibodies, and T cells destroy infected cells.
24

The same, unknown bacteria is isolated from 20 sick individuals. Their samples were grown in culture and then placed in 10 healthy mice. Those mice started to show signs of a heightened immune response. According to Koch’s postulates what is the next step in determine whether the bacteria is pathogenic?

A
Classify the bacteria as a noncommunicable disease.
B
Classify the bacteria as a communicable disease.
C
Reisolate it, and determine if it is the original unknown bacteria.
D
Treat the original 20 individuals with antibiotics.
25

Which of the following statements is (are) FALSE?I. Vertebrate blood is a type of connective tissue.II. Plasma is composed mainly of water.III. Most infectious agents we breathe in are filtered through the tonsils.IV. Lymph is returned to the circulatory system through ducts near the shoulders.

A
I only
B
II only
C
III only
D
IV only
E
I and III only
26

Which statement is best supported by the data in the graph?

Question illustration
A
Since 2000, there has been an increase in the number of people living with HIV, but a decrease in the number of people newly infected with HIV.
B
Since 1990, both the number of new HIV infections and the number of deaths due to AIDS has consistently increased.
C
The life span of a person living with HIV has become shorter.
D
Twice as many people were living with HIV in 2008 than in 2000.
27

Which best describes the lysogenic cycle?

A
A person who is infected with the herpes virus may develop a cold sore when the virus is in the lysogenic cycle.
B
The lysogenic cycle occurs mainly in extremely infectious diseases that rapidly cause infection.
C
In the lysogenic cycle, genetic material from the virus and host cells are integrated and are called a provirus.
D
In the lysogenic cycle, virus particles are produced and assembled within the host cell.
28

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.
29

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
30

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.
31

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.
32

Which component of a virus is lacking in a cell?

A
DNA
B
ribosomes
C
protein capsid
D
RNA
33

Which best explains why viruses do not have special structures or enzymes that allow them to make their own food?

A
Viruses can use energy of living cells that they infect.
B
Viruses can replicate inside a host that they infect.
C
Viruses can cause contagious illnesses in host cells.
D
Viruses integrate their RNA or DNA into infected cells.
34

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.
35

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
36

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
37

What is (are) the role(s) of complement proteins in the immune response?I. They attract white blood cells to the site of infection. II. They help other cells avoid infection. III. They cause pathogens to clump together, making the pathogens easier to identify and destroy. IV. They form a pore in the plasma membrane of a pathogen, causing it to rupture.

A
I only
B
II and IV only
C
II and III only
D
I and IV only
E
I, II, and IV only
38

Where are macrophages found in the body?I. Blood II. Infected tissues III. Lymph nodes

A
I only
B
II only
C
III only
D
II and III only
E
I, II, and III
39

Heart disease is a noncommunicable disease because

A
it can be spread.
B
it does not spread from person to person.
C
it is contagious.
D
it only affects individuals, not communities.
40

Which of the following is NOT a role of plasma proteins?

A
To destroy infectious agents
B
To help transport insoluble molecules
C
To make the blood thicker
D
To help maintain the osmotic balance and pH of the blood
E
All of the above are roles of plasma proteins.

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