Free Biodiversity and Variety of Life MCQs with Answers

461. Which of the following pairs of diseases is caused by a virus?

• A. Syphilis and Tuberculosis (TB)
• B. Aids and Typhoid
• C. Measles and Mumps
• D. Tetanus and Cholera

Explanation: Viruses are very small infectious agents. They're made up of a piece of genetic material, such as DNA or RNA, that's enclosed in a coat of protein. A viral disease is any illness or health condition caused by a virus.

462. Which of the following is true about amoeba?

• A. They have flagella
• B. They are multicellular
• C. They do not cause any disease in human
• D. They move by pseudopodia

Explanation: Amoeba belongs to the phylum Sarcodina of the kingdom Protozoa. Pseudopodia is a characteristic of their phylum. Hence, option D is the correct option.

463. All viruses are _.

• A. Autotrophs
• B. Heterotrophs
• C. Parasites
• D. Predators

Explanation: Parasites are organisms that use other organisms for food, shelter, etc, and in exchange, they harm them. Viruses live and multiply in different cells, and in exchange, cause diseases. Hence, they fit in the definition of a parasite.

464. Which of the following is transmitted through infected blood and syringes?

• A. HIV
• B. Influenza virus
• C. Morbili virus
• D. Vibrio cholera

Explanation: HIV is transmitted through the exchange of bodily fluids such as blood or sweat. Dirty needles may contain traces of blood and when they are used by another person particles of HIV will transfer to them and cause AIDS. Hence, option A is the correct option.

465. A virion is designated as?

• A. Viral enzyme
• B. Viral genome
• C. Complete virus
• D. Viral lysosome

Explanation: A virion is designated as complete virus. A fully formed infectious particle that contains a viral genome and a protein coat called a capsid, which protects the genome and allows the virus to enter host cells. Therefore, option C is correct.

466. Which are called naked viruses?

• A. Non enveloped viruses
• B. Enveloped viruses
• C. Prions
• D. Viroids

Explanation: Non-enveloped viruses are also called naked viruses because they donot have a lipid envelope surrounding their protein coat. Therefore, option A is correct.

467. Polio virus is an example of?

• A. Spherical viruses
• B. Tadpole shaped viruses
• C. Rod shaped viruses
• D. Helical shaped viruses

Explanation: The poliovirus is a good example of a spherical (icosahedral) virus made up of only two main components: a protein shell and an RNA genome. The outer protein coat protects the viral RNA and helps it attach to host cells, while the RNA inside carries the genetic instructions needed for the virus to replicate once it enters the body.

468. Which of the following is a DNA virus?

• A. Polio virus
• B. Influenza virus
• C. Herpes virus
• D. Mumps virus

Explanation: Herpes viruses are DNA viruses. HSV-1, like the other herpesviruses, carries double-stranded DNA as its genetic material.

469. Proteins that cause disease in humans and animals are called:

• A. Prions
• B. Viroid
• C. Prophage
• D. Bacteriophage
• E. Antigens

Explanation: Prions are misfolded proteins that can induce other proteins to also misfold, leading to the accumulation of abnormal protein structures in cells. This can result in neurodegenerative diseases, such as Creutzfeldt-Jakob disease in humans and mad cow disease in cattle. Prions are unique because they can propagate without nucleic acids (DNA or RNA), making them distinct from other infectious agents like bacteria and viruses.

470. Which virus kills cancer cells and aids immunity?

• A. Saccharomyces
• B. Lactobacillus
• C. Penicillium
• D. Lymph Bacterium
• E. Oncolytic

Explanation: Oncolytic viruses are viruses designed or naturally able to infect and destroy cancer cells while sparing normal tissue. They enter tumor cells, replicate inside them, and eventually cause those cells to break apart, which helps shrink the tumor and also alerts the immune system to attack remaining cancer cells.