Biology ยท General Awareness

Viral Diseases and Immunity

807 Questions

Viral diseases and immunity cover the structure, transmission, and diagnosis of viruses like HIV. Questions focus on disease pathways, immune responses, and prevention. Strong knowledge here provides an edge in biology scoring.

HIV and AIDS structureVirus transmission methodsImmune system deficiencyPathogen risk groupsMedical diagnosis methods

Viral Diseases and Immunity Questions

Multiple choice

Which of the following is a potential complication of HIV-associated osteoporosis?

  1. Fractures

  2. Kyphosis

  3. Loss of height

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

HIV-associated osteoporosis can lead to fractures, kyphosis (a humpback deformity), and loss of height.

Multiple choice

What is the recommended treatment for HIV-associated osteonecrosis?

  1. Surgical intervention

  2. Bisphosphonates

  3. Anti-inflammatory medications

  4. All of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Surgical intervention is the primary treatment for HIV-associated osteonecrosis.

Multiple choice

Which of the following is a common musculoskeletal manifestation of HIV-associated myopathy?

  1. Muscle weakness

  2. Muscle pain

  3. Muscle atrophy

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

HIV-associated myopathy can manifest as muscle weakness, muscle pain, and muscle atrophy.

Multiple choice

What is the primary goal of treatment for HIV-associated myopathy?

  1. Improving muscle strength

  2. Reducing muscle pain and inflammation

  3. Preventing disease progression

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The primary goal of treatment for HIV-associated myopathy is to improve muscle strength, reduce muscle pain and inflammation, and prevent disease progression.

Multiple choice

Which of the following is a potential complication of HIV-associated polymyositis?

  1. Respiratory failure

  2. Cardiac failure

  3. Dysphagia

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

HIV-associated polymyositis can lead to respiratory failure, cardiac failure, and dysphagia (difficulty swallowing).

Multiple choice

What is the recommended treatment for HIV-associated polymyositis?

  1. Corticosteroids

  2. Immunosuppressive drugs

  3. Physical therapy

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Treatment for HIV-associated polymyositis typically involves a combination of corticosteroids, immunosuppressive drugs, and physical therapy.

Multiple choice

Which of the following is a common skin problem that occurs in people with HIV/AIDS?

  1. Kaposi's sarcoma

  2. Psoriasis

  3. Eczema

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Kaposi's sarcoma, psoriasis, and eczema are all common skin problems that can occur in people with HIV/AIDS. Kaposi's sarcoma is a type of cancer that causes purple or red lesions to appear on the skin. Psoriasis is a chronic skin condition that causes red, scaly patches of skin to appear on the body. Eczema is a skin condition that causes dry, itchy skin.

Multiple choice

What is the best way to treat Kaposi's sarcoma in people with HIV/AIDS?

  1. Radiation therapy

  2. Chemotherapy

  3. Antiretroviral therapy

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

All of the above options can be effective in treating Kaposi's sarcoma in people with HIV/AIDS. Radiation therapy can help to shrink tumors. Chemotherapy can help to kill cancer cells. And antiretroviral therapy can help to suppress the HIV virus and improve the immune system, which can help to slow the growth of Kaposi's sarcoma tumors.

Multiple choice

Which of the following is an example of a virus that uses antigenic shift to evade the immune system?

  1. Influenza virus

  2. Human immunodeficiency virus (HIV)

  3. Herpes simplex virus (HSV)

  4. Hepatitis B virus (HBV)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Influenza virus is a well-known example of a virus that undergoes antigenic shift. This process involves the reassortment of viral RNA segments, leading to the emergence of new viral strains with altered surface proteins. This allows the virus to evade pre-existing immunity and cause recurrent infections.

Multiple choice

How does HIV evade the immune system by targeting CD4+ T cells?

  1. By expressing viral proteins that inhibit the function of CD4+ T cells

  2. By downregulating the expression of MHC class II molecules on infected cells

  3. By inducing apoptosis of CD4+ T cells

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

HIV employs multiple strategies to evade the immune system, including targeting CD4+ T cells. The virus expresses viral proteins that inhibit the function of CD4+ T cells, downregulates the expression of MHC class II molecules on infected cells, and induces apoptosis of CD4+ T cells. These mechanisms contribute to the depletion of CD4+ T cells and the development of AIDS.

Multiple choice

Which of the following is an example of a virus that establishes latency?

  1. Herpes simplex virus (HSV)

  2. Human immunodeficiency virus (HIV)

  3. Hepatitis B virus (HBV)

  4. Poliovirus
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Herpes simplex virus (HSV) is an example of a virus that establishes latency. After the initial infection, HSV can enter a latent state in sensory nerve ganglia. During latency, the virus remains dormant and evades the immune system. However, it can reactivate under certain conditions, leading to recurrent infections.

Multiple choice

Which of the following is an example of a virus that uses molecular mimicry to evade the immune system?

  1. Hepatitis B virus (HBV)

  2. Human immunodeficiency virus (HIV)

  3. Cytomegalovirus (CMV)

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Hepatitis B virus (HBV), human immunodeficiency virus (HIV), and cytomegalovirus (CMV) are all examples of viruses that use molecular mimicry to evade the immune system. HBV mimics host proteins to avoid recognition by the immune system. HIV mimics MHC molecules to interfere with the function of immune cells. CMV mimics host proteins to promote the survival of infected cells.

Multiple choice

Which of the following is an example of a virus that uses viral interference to evade the immune system?

  1. Herpes simplex virus (HSV)

  2. Influenza virus

  3. Measles virus

  4. All of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Herpes simplex virus (HSV) is an example of a virus that uses viral interference to evade the immune system. HSV can produce antiviral proteins that inhibit the replication of other viruses in infected cells. This can help HSV to establish and maintain latency, as well as to prevent superinfection by other viruses.

Multiple choice

Which of the following is an example of a virus that uses viral mutations to evade the immune system?

  1. Influenza virus

  2. Human immunodeficiency virus (HIV)

  3. Hepatitis C virus (HCV)

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Influenza virus, human immunodeficiency virus (HIV), and hepatitis C virus (HCV) are all examples of viruses that use viral mutations to evade the immune system. Influenza virus undergoes antigenic drift, which involves the accumulation of point mutations in the viral genome, leading to the emergence of new viral strains that are unrecognizable to the immune system. HIV and HCV have high mutation rates, which allow them to rapidly generate new variants that can escape immune recognition.

Multiple choice

How does viral shedding contribute to immune evasion?

  1. By releasing large amounts of virus particles into the environment

  2. By overwhelming the immune system with a high viral load

  3. By facilitating the transmission of the virus to new hosts

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Viral shedding contributes to immune evasion by releasing large amounts of virus particles into the environment, overwhelming the immune system with a high viral load, and facilitating the transmission of the virus to new hosts. By shedding large amounts of virus, the virus can increase its chances of infecting new cells and establishing new infections. The high viral load can overwhelm the immune system, making it difficult to control the infection. Additionally, viral shedding can facilitate the transmission of the virus to new hosts, allowing the virus to spread and evade immune responses in new populations.