Free Biodiversity and Variety of Life MCQs with Answers

• A. Polio virus
• B. Mumps virus
• C. Chicken pox virus
• D. All of these

Explanation: All viruses cause infection in human beings and get transferred by specific vector.

• A. Spray
• B. Tablets
• C. Oral drops
• D. Local application

Explanation: Live vaccine of polio is given orally, while killed vaccines given by injection.

• A. Viruses
• B. Prions
• C. Fungus
• D. Amoeba

Explanation: Prions are simplest form of pathogens because they are only proteins structurally. Viruses are nucleoproteins.

• A. AIDS
• B. Malaria
• C. Chicken pox
• D. Influenza

Explanation: Malaria is caused by Plasmodium which is animal like protist.

• A. HIV
• B. HCV
• C. HSV-2
• D. HSV-I

Explanation: The causative agent of oral herpes is Herpes Simplex Virus type 1.

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

Explanation: The only known human disease caused by a viroid is hepatitis D.

• A. Polio virus
• B. HBV
• C. HIV
• D. Rous sarcoma virus

Explanation: Rous sarcoma virus (RSV) is an Oncovirus, which is known to cause sarcomas (tissue cancers) in fowls.

• A. B-lymphocytes
• B. T-Helper cells
• C. Natural killer cells
• D. T-Lymphocytes

Explanation: HIV attacks on specific type of immune cell in the body, known as T-helper cells.

• A. Viral DNA
• B. Host DNA
• C. Viral RNA
• D. T-Lymphocytes

Explanation: HIV is equipped with reverse transcriptase along with the other essential enzymes.

• A. lntegrase
• B. Reverse transcriptase
• C. Protease
• D. Nuclease

Explanation: HIV integeration is the insertion of HIV genetic material into the genome of the infected cell.

• A. Intimate sexual contact
• B. Contact with blood
• C. Breast feeding
• D. Saliva

Explanation: Modes of transmission of HIV are blood transfusion, sexual contacts and breast-feeding. Saliva is not the source of transmission of HIV.

• A. Outside the cell
• B. In cytoplasm
• C. In nucleus
• D. At any place

Explanation: Uncoating of HIV occurs in the cytoplasm of the host cell. After fusion with the host cell membrane, the viral capsid is released into the…

• A. gp31
• B. gp120
• C. gp141
• D. gp41

Explanation: In the context of fusion with T cells, gp120 plays a crucial role in the attachment to the CD4 receptor, while gp41 is involved in the…

• A. DNA Replication in cytoplasm
• B. Translation in cytoplasm
• C. Transcription in nucleus
• D. Reverse transcription in cytoplasm

Explanation: Viruses attack target cells and use biosynthetic machinery (ribosomes: present in cytoplasm) of host for protein synthesis.

• A. CD4
• B. CD8
• C. CD2
• D. CD1

Explanation: CD means cluster of differentiation. There are many types of CD proteins such as CD4 and CD8 etc.

• A. Destruction of body immune system
• B. Recurrent pneumonia
• C. Pulmonary tuberculosis
• D. Toxoplasmosis

Explanation: This statement is a general characteristic of HIV infection but not a specific opportunistic disease.

• A. Attachment
• B. Adsorption
• C. Penetration
• D. Injection

Explanation: In the traditional description of the bacteriophage life cycle, the release of lysozyme occurs during the penetration step.

• A. Poliovirus
• B. Poxvirus
• C. Influenza virus
• D. Herpes virus

Explanation: So, the correct option for an RNA non-enveloped virus from the given choices is A) Poliovirus.

• A. Peptidoglycan
• B. Conjugation
• C. Haploid
• D. Capsule

Explanation: The correct answer, based on the options provided, is C) Haploid. All bacteria have a single set of chromosomes, which makes them haploid…

• A. Diplococci
• B. Sarcina
• C. Streptoococci
• D. Staphylococci

Explanation: So, when cocci form a long chain of cells, the arrangement is called "Streptococci."