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. Protein sheath
- B. Genome
- C. Protein coat
- D. Tail
Explanation: The genome of a bacteriophage enters the host cell. Here is the explanation of each of the options:1.
Correct answer: Genome- A. Dehydrogenase
- B. Urease
- C. Lysozyme
- D. Arginase
Explanation: Lysozyme is a ubiquitous enzyme present in all living organisms and viruses to break down cell walls.
Correct answer: Lysozyme- A. Influenza
- B. Polio
- C. Mumps
- D. Herpes
Explanation: Lesions around the mouth and lips are most commonly associated with herpes (specifically HSV-1).
Correct answer: Herpes- A. Mumps
- B. Small pox
- C. Herpes simplex
- D. Influenza
Explanation: Mumps belongs to the group of paramyxoviruses. It is highly contagious, and this disease causes painful swelling of the parotid glands.
Correct answer: Mumps- A. ssRNA
- B. dsRNA
- C. ssDNA
- D. dsDNA
Explanation: Smallpox is caused by the Variola virus, which has a double-stranded DNA genome.
Correct answer: dsDNA- A. Hepatitis A
- B. Hepatitis B
- C. Hepatitis C
- D. Hepatitis E
Explanation: Hepatitis E is the correct option because pigs serve as a natural reservoir for certain genotypes of the hepatitis E virus, particularly…
Correct answer: Hepatitis E- A. By the host cell
- B. On the interior surface of the viral membrane
- C. On the viral ribosomes
- D. On the interior surface of the viral coat
Explanation: The enzymes involved in viral replication are synthesized by the host cell machinery after the virus infects the cell.
Correct answer: By the host cell- A. Rabies, Measles
- B. Cholera, Tuberculosis
- C. Typhoid, Tetanus
- D. AIDS, Syphilis
Explanation: Cholera, typhoid, tuberculosis, syphilis, and tetanus are bacterial diseases, while measles and mumps are viral diseases.
Correct answer: Rabies, Measles- A. Polio virus
- B. Mumps virus
- C. Chickenpox virus
- D. All of these
Explanation: All viruses cause infection in human beings and are transmitted by specific vectors.
Correct answer: All of these- A. Viruses
- B. Prions
- C. Fungus
- D. Amoeba
Explanation: Prions are the simplest form of pathogens because they are only proteins structurally. Viruses are nucleoproteins.
Correct answer: Prions- A. lntegrase
- B. Reverse transcriptase
- C. Protease
- D. Nuclease
Explanation: HIV integration is the insertion of HIV genetic material into the genome of the infected cell.
Correct answer: lntegrase- A. Outside the cell
- B. In cytoplasm
- C. In nucleus
- D. At any place
Explanation: Uncoating of the HIV virion occurs in the cytoplasm of the host cell shortly after the viral envelope fuses with the host plasma membrane.
Correct answer: In cytoplasm- 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, attached to the cell membranes of different…
Correct answer: CD4- A. T-killer lymphocytes
- B. B-plasma cells
- C. T-helper lymphocytes
- D. B-memory cells
Explanation: HIV primarily targets immune cells that play a central role in defending the body against infections.
Correct answer: T-helper lymphocytes- A. Liver cells
- B. B-lymphocytes
- C. Red blood cells
- D. Helper T-lymphocytes
Explanation: HIV, the virus responsible for AIDS, primarily targets the immune system, specifically a type of white blood cell called the CD4+ T…
Correct answer: Helper T-lymphocytes- A. Measles
- B. Influenza
- C. Hepatitis A
- D. AIDS
Explanation: Among the given options, the correct answer is d. AIDS. Measles, influenza, and hepatitis A can temporarily weaken the immune system…
Correct answer: AIDS- A. Retrovirus
- B. It is surrounded by an envelope
- C. It does not cause AIDS
- D. It causes a deficiency in the human immune system
Explanation: HIV is the virus that causes AIDS (Acquired Immunodeficiency Syndrome).
Correct answer: It does not cause AIDS- A. Attachment
- B. Adsorption
- C. Penetration
- D. Injection
Explanation: The correct answer is penetration. During the penetration phase of the bacteriophage life cycle, lysozyme is released to break down the…
Correct answer: Penetration- A. Obligate intracellular parasite
- B. Obligate ectoparasite
- C. Facultative intracellular parasite
- D. Facultative endoparasite
Explanation: Bacteriophages are obligate intracellular parasites. They infect bacteria, and their life cycle involves attachment to the bacterial cell…
Correct answer: Obligate intracellular parasite- A. Virions
- B. Prions
- C. Viroids
- D. Non-enveloped viruses
Explanation: Prions are infectious agents made only of misfolded proteins without any nucleic acid, causing disease by converting normal host proteins…
Correct answer: Prions