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. Mitochondria
- B. Nucleus
- C. Ribosomes
- D. Endoplasmic reticulum
Explanation: The correct answer is C) Ribosomes, as many viruses hijack the host cell's ribosomes to produce viral proteins required for the…
Correct answer: Ribosomes302. It is anti-viral:
- A. Penicillin
- B. Streptomycin
- C. Tetracycline
- D. Interferon
Explanation: The correct answer is D) Interferon, as it is an antiviral protein produced by the body's immune system to combat viral infections.
Correct answer: Interferon- A. Hapatitis A
- B. Hepatitis B
- C. Hepatitis C
- D. Hepatitis D
Explanation: The correct answer is B) Hepatitis B, as it is the second major form of hepatitis caused by the Hepatitis B virus (HBV).
Correct answer: Hepatitis B- A. Flagella
- B. Pilli
- C. Cytoplasm
- D. Mesosomes
Explanation: The correct answer is B) Pili, as they are the structures involved in the transfer of genetic material from one bacterium to another…
Correct answer: Pilli- A. Spherical
- B. Spiral
- C. Rod-shape
- D. Comma-shape
Explanation: The correct answer is C) Rod-shape, as Salmonella typhi exhibits a rod-shaped morphology.
Correct answer: Rod-shape- A. Clostridium tetani
- B. Spirillum
- C. Salmonella typhi
- D. Mycoplasma
Explanation: Mycoplasma is a type of bacteria that lacks a rigid cell wall. As a result, it doesn't have a definite shape like other bacteria.
Correct answer: Mycoplasma- A. Microbistatic
- B. Biostatic
- C. Microbicidal
- D. Chemotherapeutic
Explanation: Microbicidal accurately describes antibiotics that directly and immediately kill microbes, while the other options refer to different…
Correct answer: Microbicidal- A. DNA replication
- B. Protein synthesis
- C. RNA synthesis
- D. Metabolism
Explanation: Mesosomes are the areas in the cell membrane of prokaryotic cell which fold inwards.
Correct answer: DNA replication- A. Gram-positive bacteria have more lipids in their cell wall
- B. Gram-negative bacteria have more lipids in their cell wall
- C. Lipids are absent in the cell wall of both gram-positive and negative bacteria
- D. Both have an equal amount of lipids
Explanation: The key difference in the cell walls of gram-positive and gram-negative bacteria is the presence of an outer membrane in gram-negative…
Correct answer: Gram-negative bacteria have more lipids in their cell wall- A. RNA nucleotides are more unstable than DNA nucleotides
- B. Replication of their nucleic acid does not involve the proofreading steps of DNA replication
- C. RNA viruses replicate faster
- D. RNA viruses respond more to mutagens
Explanation: The primary reason for the higher mutation rate in RNA viruses is that their replication process lacks the proofreading mechanisms that…
Correct answer: Replication of their nucleic acid does not involve the proofreading steps of DNA replication- A. RNA-dependent RNA polymerase
- B. DNA-dependent RNA polymerase
- C. DNA-dependent DNA polymerase
- D. RNA-dependent DNA polymerase
Explanation: The term "reverse transcriptase" refers to an enzyme found in retroviruses (a type of RNA virus) that can synthesize a complementary DNA…
Correct answer: RNA-dependent DNA polymerase- A. Viruses possess their own metabolic system
- B. Viruses are obligate parasite
- C. All viruses contain both RNA and DNA
- D. The nucleic acid of viruses is known as capsid
Explanation: Viruses are obligate parasites, meaning they require a host cell to replicate and complete their life cycle.
Correct answer: Viruses are obligate parasite- A. Ammonifying
- B. Denitrifying
- C. Nitrifying
- D. Nitrogen-fixing bacteria
Explanation: Denitrifying bacteria are responsible for converting nitrates (NO3-) into free nitrogen gas (N2) through a process known as…
Correct answer: Denitrifying- A. High content of peptidoglycan
- B. High permeability
- C. Teichoic acid is present
- D. Stain pink with primary dye
Explanation: Gram-positive bacteria stain purple with the primary dye in the Gram staining procedure.
Correct answer: Stain pink with primary dye- A. Pathogenic nature
- B. Having well-defined cytoplasm
- C. Genetic material
- D. Lacking proper nucleus
Explanation: Bacteria are unicellular organisms that have well-defined cellular structures, including a well-defined cytoplasm.
Correct answer: Having well-defined cytoplasm- A. 175 x 10^5
- B. 5 x 10^5
- C. 35 x 10^5
- D. 32 x 10^5
Explanation: To calculate the cell concentration after a certain period of growth, you can use the formula: Final cell concentration = Initial cell…
Correct answer: 32 x 10^5- A. A
- B. D
- C. C
- D. K
Explanation: Vitamin K is synthesized by bacteria in the human gut. Specifically, the bacteria found in the colon are responsible for producing vitamin…
Correct answer: K- A. Single stranded RNA
- B. Double stranded DNA
- C. Double stranded RNA
- D. Single stranded DNA
Explanation: While the original genetic material of HIV is single-stranded RNA, the virus undergoes a process called reverse transcription.
Correct answer: Double stranded DNA- A. Single-stranded RNA genome into single-stranded DNA
- B. Single-stranded RNA genome into double-stranded DNA
- C. Double-stranded DNA genome into single-stranded RNA
- D. Double-stranded DNA genome into double-stranded RNA
Explanation: Reverse transcriptase is a key enzyme in certain viruses, such as retroviruses, which include HIV.
Correct answer: Single-stranded RNA genome into double-stranded DNA- A. Prophage
- B. Provirus
- C. Bacteriophage
- D. Phage virus
Explanation: A prophage is a phage DNA that has been integrated into the DNA of a bacterial host cell.
Correct answer: Prophage