Free Biodiversity and Variety of Life MCQs with Answers
3,130 Biodiversity and Variety of Life MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Biological classification uses taxonomic ranks, binomial nomenclature and shared characteristics to organize life into kingdoms. The major groups include prokaryotes, protists, fungi, plants and animals, with comparisons based on cell type, cell wall, nutrition, body organization, reproduction and evolutionary relationships; prokaryotes lack a membrane-bound nucleus.
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- A. Too small
- B. Lack metabolic machinery
- C. Have no cell wall
- D. All of these
Explanation: Option B is correct. Viruses do not replicate on their own because they are not living organisms and lack the metabolic machinery.
Correct answer: Lack metabolic machinery- A. Acellular nature
- B. DNA
- C. RNA
- D. Metabolism
Explanation: Option D is correct. Viruses do not replicate on their own because they are not living organisms and lack the metabolic machinery.
Correct answer: Metabolism- A. 1986
- B. 1981
- C. 1983
- D. 1990,
Explanation: In 1981, AIDS was first recognized as a new disease, but the virus was unknown.
Correct answer: 1986- A. Simplex
- B. Quadruplex
- C. Triplex
- D. Duplex
Explanation: The correct answer is option A. The herpes virus is responsible for the simplex type of herpes.
Correct answer: Simplex- A. Liposomes
- B. Glycoprotein
- C. Polysaccharides
- D. Lipopolysaccharides
Explanation: Option B is correct, as glycoprotein acts as a receptor molecule, to which the attachment proteins on the enveloped viruses bind, to allow…
Correct answer: Glycoprotein- A. Pneumonia
- B. Rapid weight loss
- C. Extreme and unexplained tiredness.
- D. All of these
Explanation: AIDS, or acquired immunodeficiency syndrome, is the most advanced stage of HIV infection.
Correct answer: All of these- A. HIV-2
- B. HIV-1(a)
- C. HIV-1
- D. HIV-2(a)
Explanation: HIV-2 is less virulent, has a slower disease progression, and is mostly confined to West Africa, with limited global spread.
Correct answer: HIV-1- A. Virus mutates rapidly
- B. Vaccine is very expensive
- C. Vaccines can be controlled by changes in hygiene.
- D. None of these
Explanation: The correct answer is "virus mutates rapidly." HIV is a retrovirus, which means that it reverse transcribes its RNA into DNA.
Correct answer: Virus mutates rapidly669. HIV mainly attacks:
- A. CD4 site of T cells
- B. B cells
- C. White blood cells
- D. None of these
Explanation: HIV mainly attacks the CD4 site of T cells. T cells are a type of white blood cell that is important for the immune system.
Correct answer: CD4 site of T cells- A. Integrase
- B. DNA incorporase
- C. Reverse transcriptase
- D. Protease
Explanation: The viral genome is integrated into the host genome by the integrase enzyme.
Correct answer: Integrase- A. Faeces
- B. Sexual contact
- C. Sharing needles and syringes
- D. All of these
Explanation: HAV, or hepatitis A virus, is a virus that can cause hepatitis, an inflammation of the liver.
Correct answer: Faeces- A. 2001
- B. 1999
- C. 2005
- D. 2000
Explanation: By 2001, several early-phase clinical trials (Phase I and II) of experimental HIV vaccines were underway.
Correct answer: 2001673. Pigs are related to:
- A. HEV
- B. HAV
- C. HBV
- D. HCV
Explanation: In pigs, swine hepatitis E (HEV) causes microscopic lesions in the liver without any clinical presentation.
Correct answer: HEV- A. RNA virus
- B. DNA virus
- C. Bacteriophage
- D. dsDNA virus
Explanation: Option (a) states that the tobacco mosaic virus (TMV) is an RNA virus. This statement is correct.
Correct answer: RNA virus- A. Structure
- B. Size
- C. Nucleic acid
- D. All of above
Explanation: The answer is all of the above. Poxviruses are different from all other viruses in terms of their structure, size, and nucleic acid.
Correct answer: All of above- A. HBV
- B. HAV
- C. HCV
- D. Options A and B are correct
Explanation: Option (d) suggests that both the Hepatitis B virus (HBV) and the Hepatitis A virus (HAV) have genetically engineered vaccines available.
Correct answer: Options A and B are correct677. Poxvirus has:
- A. Double stranded DNA
- B. Single stranded DNA
- C. Double stranded RNA
- D. Both A and C
Explanation: Poxviruses have double-stranded DNA. They are the only known viruses with this type of genome.
Correct answer: Double stranded DNA- A. Complement receptor
- B. Integrin ICAM-1
- C. Acetylcholine receptor
- D. Epidermal growth factor receptor
Explanation: To clarify, the attachment of the rabies virus to host cells involves interactions between viral glycoproteins and specific receptors, and…
Correct answer: Acetylcholine receptor- A. RBCs
- B. Platelets
- C. Helper T lymphocytes
- D. None of these
Explanation: The human immunodeficiency virus (HIV) infects leukocytes, also known as white blood cells.
Correct answer: Helper T lymphocytes- A. DNA polymerase
- B. Ligase
- C. Reverse transcriptase
- D. Helicase
Explanation: Retroviruses have a specialized enzyme called reverse transcriptase. Reverse transcriptase is an enzyme that can transcribe RNA into DNA.
Correct answer: Reverse transcriptase