Human Health and Disease Practice Quiz (11 questions)

Question 1

1. Which description captures health as a whole rather than as the mere absence of disease?

Complete physical, mental, and social well-being

Complete physical well-being without mental or social dimensions

Freedom from infectious disease and its symptoms

Physical and mental well-being without social well-being

Explanation

Health encompasses physical, mental, and social well-being. Defining it as physical condition, freedom from infection, or well-being that omits a dimension narrows the definition.

Answer

Complete physical, mental, and social well-being

Question 2

2. A disease in a case study is identified as cancer and is not transmitted from one person to another. How should it be classified?

A non-infectious disease

An infectious disease

A disease classified by severity

A person-to-person communicable disease

Explanation

Non-infectious diseases are not transmitted from person to person, and cancer is an example. Calling it infectious or communicable confuses it with transmissible disease; severity does not determine this classification.

Answer

A non-infectious disease

Question 3

3. Several people become ill after eating food contaminated with Salmonella typhi. Which disease best fits this cause and route of acquisition?

Cholera

Pneumonia

Typhoid

Tuberculosis

Explanation

Typhoid is caused by Salmonella typhi and can be acquired through contaminated food or water. Cholera involves Vibrio cholerae, tuberculosis involves Mycobacterium tuberculosis, and pneumonia is associated with other bacteria.

Answer

BCG vaccine

Answer

Fungi from genera such as Microsporum, Trichophyton, and Epidermophyton

Answer

Avoid close contact with infected people and their belongings

Answer

It enables a stronger response after later exposure to the same pathogen.

Answer

It induces memory B and T cells that recognize the pathogen and support a rapid, strong response.

Answer

The thymus supports T-lymphocyte development and maturation, while the spleen contains lymphocytes and phagocytes and stores erythrocytes.

Answer

Reverse transcriptase

Answer

Cells keep dividing despite contact with neighboring cells, forming an expanding mass.

Question 4

4. A patient has fever, cough, and blood-stained sputum, and a clinician wants to prevent tuberculosis in a child. Which vaccine is relevant?

BCG vaccine

A vaccine for pneumonia

A vaccine for typhoid

A vaccine for cholera

Explanation

Tuberculosis, caused by Mycobacterium tuberculosis, can produce fever, cough, and blood-stained sputum, and BCG vaccination is a preventive measure. The other choices misattribute the disease or its prevention to cholera, typhoid, or pneumonia.

Question 5

5. What is the cause of ringworm, a condition that produces dry, scaly, intensely itchy lesions on the skin, nails, or scalp?

A protozoan parasite called Entamoeba histolytica

Wuchereria worms that affect the lymphatic vessels

Fungi from genera such as Microsporum, Trichophyton, and Epidermophyton

A roundworm of the genus Ascaris that inhabits the intestine

Explanation

Ringworm is caused by fungi belonging to Microsporum, Trichophyton, and Epidermophyton. Ascaris, Entamoeba histolytica, and Wuchereria cause distinct parasitic diseases rather than ringworm.

Question 6

6. Which measure is specifically recommended to prevent airborne infections such as pneumonia and the common cold?

Use clean drinking water and carefully washed produce

Avoid close contact with infected people and their belongings

Introduce Gambusia fish into ponds and other water bodies

Disinfect water reservoirs, pools, and tanks periodically

Explanation

Keeping distance from infected people and their belongings reduces exposure to respiratory infections spread through the air. Introducing Gambusia fish is a vector-control measure aimed at mosquito breeding, not airborne transmission.

Question 7

7. What is the main function of immunological memory in acquired immunity?

It allows T lymphocytes to secrete antibodies into the blood.

It provides a general barrier against foreign agents from birth.

It enables a stronger response after later exposure to the same pathogen.

It prevents pathogens from entering the body through physical barriers.

Explanation

Immunological memory enables the secondary response to the same pathogen to be much more intense than the primary response. Innate barriers are present from birth, but they are non-specific and do not account for this heightened response on re-exposure.

Question 8

8. How does vaccination prepare the immune system to respond to a later encounter with a pathogen?

It prevents lymphocytes from encountering pathogen antigens during the initial immune response.

It makes the body attack its own cells so they can eliminate the pathogen.

It causes mast cells to release histamine and serotonin when the pathogen enters the body.

It induces memory B and T cells that recognize the pathogen and support a rapid, strong response.

Explanation

Vaccination introduces pathogen antigens or weakened or inactivated pathogens, inducing memory B and T cells that enable rapid recognition and substantial production upon later exposure. Mast-cell mediator release is associated with allergic symptoms, not the immune memory produced by vaccination.

Question 9

9. How do the thymus and spleen differ in their primary roles within the lymphoid system?

The thymus traps antigens to activate lymphocytes, while the spleen provides the environment for T-lymphocyte maturation.

The thymus stores erythrocytes, while the spleen produces all blood cells, including lymphocytes.

The thymus produces all blood cells, while the spleen supplies the lining of respiratory and digestive tracts with lymphoid tissue.

The thymus supports T-lymphocyte development and maturation, while the spleen contains lymphocytes and phagocytes and stores erythrocytes.

Explanation

The thymus provides the environment in which T lymphocytes develop and mature, whereas the spleen contains immune cells and acts as a reservoir of erythrocytes. The lymphocyte-activating role described for the thymus belongs chiefly to lymph nodes, not the thymus.

Question 10

10. Which enzyme enables HIV to convert its RNA into DNA after entering a host cell?

DNA polymerase

Integrase

Reverse transcriptase

RNA polymerase

Explanation

Reverse transcriptase converts HIV RNA into DNA, which can then integrate into the host-cell DNA. Integrase is a plausible distractor because it participates in the process, but it inserts the DNA rather than converting RNA into DNA.

Question 11

11. How does losing contact inhibition contribute to the development of cancer?

Cells leave the bloodstream and establish tumors in distant organs.

Cells keep dividing despite contact with neighboring cells, forming an expanding mass.

Cells stop dividing when they touch neighboring cells, preventing tissue overgrowth.

Cells become more responsive to immune signals that limit their growth.

Explanation

Contact inhibition normally limits cell division when cells encounter neighboring cells, and cancer cells lose this restraint, enabling uncontrolled growth. Metastasis involves the spread of malignant cells to distant sites, rather than the loss of this local growth control.

Human Health and Disease Practice Quiz (11 questions)

All questions and answers

1. Which description captures health as a whole rather than as the mere absence of disease?

2. A disease in a case study is identified as cancer and is not transmitted from one person to another. How should it be classified?

3. Several people become ill after eating food contaminated with Salmonella typhi. Which disease best fits this cause and route of acquisition?

4. A patient has fever, cough, and blood-stained sputum, and a clinician wants to prevent tuberculosis in a child. Which vaccine is relevant?

5. What is the cause of ringworm, a condition that produces dry, scaly, intensely itchy lesions on the skin, nails, or scalp?

6. Which measure is specifically recommended to prevent airborne infections such as pneumonia and the common cold?

7. What is the main function of immunological memory in acquired immunity?

8. How does vaccination prepare the immune system to respond to a later encounter with a pathogen?

9. How do the thymus and spleen differ in their primary roles within the lymphoid system?

10. Which enzyme enables HIV to convert its RNA into DNA after entering a host cell?

11. How does losing contact inhibition contribute to the development of cancer?

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