All Free Biology MCQs with Answers

2871. Human immunodeficiency virus (HIV) particles surround with a coat known as the viral envelope or membrane made up of:

• A. Glycoprotein
• B. Glycolipid
• C. Lipoprotein
• D. Sulpholipid

Explanation: Lipoproteins are particles made of protein and fats (lipids). Viral envelopes consist of a lipoprotein bilayer that closely surrounds a shell of virus-encoded membrane-associated proteins.

2872. The word hepatitis means inflammation of the:

• A. Pancreas
• B. Liver
• C. Spleen
• D. Gall bladder

Explanation: Hepatitis means inflammation of the liver. The liver is a vital organ that processes nutrients, filters the blood, and fights infections. When the liver is inflamed or damaged, its function can be affected. Heavy alcohol use, toxins, some medications, and certain medical conditions can cause hepatitis.

2873. 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.

2874. 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.

2875. 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.

2876. 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.

2877. 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.

2878. 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.

2879. 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.

2880. 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.