Free Biodiversity and Variety of Life MCQs with Answers

251. HAV is transmitted through:

• A. Blood
• B. Scrum
• C. Fecal oral route
• D. Syringes

Explanation: The virus spreads by the fecal-oral route, and infections often occur in conditions of poor sanitation and overcrowding.

252. Poliomyelitis affects:

• A. Sensory neuron
• B. Brain
• C. Motor neuron
• D. Muscles

Explanation: Poliovirus replicates in oropharynx, intestine and spread through blood to nervous system. Poliovirus replicates in motor neuron localed in spinal cord. Death of these cell result in paralysis.

253. Small pox is caused by poxvirus which is:

• A. DNA Naked Virus
• B. RNA Enveloped Virus
• C. RNA Naked Virus
• D. DNA Enveloped Virus

Explanation: Poxvirus is DNA enveloped virus, which caused epidemic in the past causing samII pox, but now this disease, has been eradicated from the world.

254. Mad cow disease is caused by:

• A. Virus
• B. Virion
• C. Viroid
• D. Prion

Explanation: Prions are infectious particles made up of only proteins containing information for replication and cause mad cow infection and mysterious brain infection in man.

255. Hepatitis C is also known as:

• A. Infections Hepatitis
• B. Scrum Hepatitis
• C. Infusion Hepatitis
• D. Delta Hepatitis

Explanation: Hepatitis C virus is RNA enveloped virus that causes infusion hepatitis. Hepatitis A is known as infectious hepatitis, while the common name of hepatitis B is scrum hepatitis.

256. Pigs are reservoir for:

• A. Hepatitis A
• B. Hepatitis B
• C. Hepatitis C
• D. Hepatitis E

Explanation: Most recent work of Halbur and coworker (2001) reveals that pig could be the source of infection of hepatitis E.

257. The enzyme involved in viral replication are synthesized:

• A. By the host cell
• B. On the interior surface of viral membrane
• C. On the viral ribosomes
• D. On the interior surface of viral coat

Explanation: Viruses are obligate intracellular parasites. They use host biosynthetic machinery for protein synthesis.

258. Ribavirin is used to treat:

• A. Hepatitis C
• B. Hepatitis B
• C. Hepatitis A
• D. Hepatitis D

Explanation: Ribavirin is an antiviral medication used in combination with other drugs to treat Hepatitis C. It is often part of a regimen for managing chronic Hepatitis C infections.

259. Virus that affects genital organs:

• A. HCV
• B. HSV
• C. HIV
• D. Pox virus

Explanation: Different viruses attack different parts of human body such as hepatitis virus affects liver and polio virus affects nervous system. There are two types of herpes simplex viruses. HSV-1 affects lips and mouth parts and is called oral herpes. HSV-2 damages genital organs and is called as genital herpes.

260. Which of the following pair of diseases is viral?

• A. Rabies, Measles
• B. Cholera, Tuberculosis
• C. Typhoid, Tetanus
• D. AIDS, Syphilis

Explanation: Cholera, typhoid, tuberculosis, syphilis and tetanus are bacterial diseases.