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. Host RNA
- B. Viral RNA
- C. Host DNA
- D. Viral DNA
Explanation: Option B is correct.HIV is equipped with various enzymes and among them: reverse transcriptase is of great importance.
Correct answer: Viral RNA- A. T-killer lymphocytes
- B. T-helper lymphocytes
- C. B-plasma cells
- D. B-memory cells
Explanation: Option B is correct.A)T-killer lymphocytes, also known as cytotoxic T-cells, are a type of T-cell that is responsible for killing infected…
Correct answer: T-helper lymphocytes- A. Bacteriophage
- B. Oncovirus
- C. Retrovirus
- D. Icosahedral virus
Explanation: Option C is correct.A)A bacteriophage, also known as a phage, is a virus that infects and replicates within bacteria.
Correct answer: Retrovirus- A. Viruses
- B. Bacteria
- C. Protists
- D. Lower animals
Explanation: Cilia and flagella are absent in in viruses other organisms may contain these structures.1.
Correct answer: Viruses- A. Nucleocapsid
- B. Envelope
- C. Capsomeres
- D. Prions
Explanation: Option A is correct.A)A nucleocapsid is the protein coat that surrounds the nucleic acid of a virus particle.
Correct answer: Nucleocapsid- A. Lipid
- B. Protein
- C. RNA
- D. DNA
Explanation: Option B is correct.Chemically, a virion is made up core of genetic material: either DNA or RNA surrounded by a protective coat called a…
Correct answer: Protein- A. DNA polymerase
- B. Reverse transcriptase
- C. RNA polymerase
- D. Ligase
Explanation: Option B is correct.HIV contains three enzymes that are essential for its replication:1)Reverse transcriptase: Reverse transcriptase is an…
Correct answer: RNA polymerase- A. Polio virus
- B. Tobacco mosaic virus
- C. Hepatitis virus
- D. Influenza virus
Explanation: Option B is correct.Karl Landsteiner and Erwin Popper discovered the poliovirus in 1908.
Correct answer: Tobacco mosaic virus- A. Stanley
- B. Pasteur
- C. Lwanowsky
- D. D' Herelle
Explanation: Option C is correct. Stanley was the first scientist who crystallized tobacco mosaic virus in 1935.TMV is transmitted from infected plant…
Correct answer: Lwanowsky- A. Blood Plasma
- B. Skin cell
- C. Plant cell
- D. All of these
Explanation: One of the most important features of viruses is that they can reproduce unity in living cells, where they reproduce by replication.
Correct answer: All of these- A. Viruses
- B. Fungi
- C. Algae
- D. Bacteria
Explanation: Option A is correct.All viruses are parasites. They are obligate intracellular parasites, which means that they can only replicate inside…
Correct answer: Viruses- A. 1/10
- B. 1/100 times
- C. 1/100
- D. 1/1000
Explanation: Option D is correct. Viruses are very small. Size of largest virus (Poxvirus) is almost equal to size of smallest bacteria.The volume of a…
Correct answer: 1/1000- A. Facultative parasites
- B. Endoparasites
- C. Obligate intracellular parasites
- D. Ectoparasites
Explanation: Option C is correct. Viruses cannot be grown in anificial media because they lack metabolic machinery for the synthesis of their own…
Correct answer: Obligate intracellular parasites- A. Animal cells
- B. Bacterial cells
- C. Living cells
- D. Non-living cells
Explanation: Option C is correct Viruses can only reproduce inside cells, but not necessarily animal cells.
Correct answer: Living cells- A. Poxvirus
- B. Parvovirus
- C. Reovirus
- D. Togavirus
Explanation: Option A is correct.Pox viruses are a family of viruses that contain double-stranded DNA.
Correct answer: Poxvirus- A. Nucleic acid
- B. Capsid
- C. Envelope
- D. None of these
Explanation: Not all viruses have envelope ,but a virus should have a nucleic acid and a protein coat always.
Correct answer: Envelope- A. DNA
- B. Protein
- C. RNA
- D. Both DNA and RNA
Explanation: Genome of animal viruses mostly contains DNA, whereas genome of plant viruses mostly contain RNA. So, option A is correct.
Correct answer: DNA- A. DNA polymerase
- B. Reverse transcriptase
- C. RNA polymerase
- D. Ligase
Explanation: Among the options provided, "Reverse transcriptase" is the enzyme naturally found in HIV.Here's an explanation of each option:1.
Correct answer: Reverse transcriptase- A. They survive for a short time
- B. They are tolerant to antibodies
- C. Their envelope is sensitive to sunlight
- D. Envelope is derived from host
Explanation: Enveloped viruses are less resistant to antibodies or disinfectants and can be easily destroyed.
Correct answer: They are tolerant to antibodies- A. Venom
- B. Virion
- C. Genome
- D. Capsid
Explanation: Correct option is B. A complete virus particle is called a virion. The main function of the virion is to deliver its DNA or RNA genome…
Correct answer: Virion