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. Nucleoid
- B. Nucleus
- C. Mitochondria
- D. Mesosome
Explanation: The DNA of bacteria is present in the nucleoid. The nucleoid is a distinct region within the bacterial cell where the genetic material…
Correct answer: Nucleoid2242. Antibiotics act against:
- A. Bacterial diseases
- B. Allergies
- C. Viral Diseases
- D. Bacterial and Viral Diseases
Explanation: Antibiotics are medications that are used to treat bacterial infections. They work by killing or preventing the growth of bacteria.
Correct answer: Bacterial diseases- A. Slime
- B. Plasmid
- C. Capsule
- D. Pili
Explanation: Plasmids can be responsible for drug resistance in bacteria. Plasmids are small, circular pieces of DNA that can be found in bacteria.
Correct answer: Plasmid- A. Cell wall
- B. Cell membrane
- C. Ribosomes
- D. Capsule
Explanation: The capsule is an outer wrapping or envelope found in certain bacterial cells but missing in others.
Correct answer: Capsule2245. Bacteria vary in:
- A. Size
- B. Size as well as in shape
- C. Shape
- D. Cell type
Explanation: Bacteria vary in both size and shape. Size ranges from microscopic, such as 0.5 to 5 micrometers, and shape can be diverse, including…
Correct answer: Size as well as in shape- A. Square
- B. Vibrio
- C. Spirillum
- D. Spirochete
Explanation: Square-shaped bacteria are not commonly found in nature and are considered exceptional in bacterial morphology.
Correct answer: Square- A. Radiations
- B. Chemicals
- C. Membrane filters
- D. Dry heat
Explanation: Compounds such as antibiotics, seras, hormones, etc are heat sensitive. Heat-sensitive compounds can be sterilized by membrane filters.
Correct answer: Membrane filters- A. Peptidoglycan
- B. rRNA
- C. Histones
- D. Teichoic acid
Explanation: In general, bacteria do not contain histones. Histones are a class of proteins that play a crucial role in the packaging and organization…
Correct answer: Histones- A. Nucleoids
- B. Mesosomes
- C. Chromatin Bodies
- D. Plasmids
Explanation: "The explanation for this question will be added soon!".
Correct answer: Plasmids- A. Stationary phase
- B. LAG phase
- C. Decline phase
- D. LOG phase
Explanation: The correct answer is the decline phase. During this phase, the conditions are no longer favorable for bacterial growth due to the…
Correct answer: Decline phase- A. Lag phase
- B. Log phase
- C. Stationary phase
- D. Death/Decline phase
Explanation: The exponential or the log phase is the phase during which the bacterium increases the most rapidly.
Correct answer: Log phase- A. AIDS
- B. Genital herpes
- C. Syphilis
- D. Gonorrhea
Explanation: Treponema pallidum is the bacterium responsible for causing syphilis, a sexually transmitted infection.
Correct answer: Syphilis- A. Nucleolus
- B. Centrosome
- C. Nucleoid
- D. Nucleus
Explanation: The correct answer is nucleoid. In bacteria, which are prokaryotic organisms, the genetic material is located in a region known as the…
Correct answer: Nucleoid- A. Robert Koch
- B. Louis Pasteur
- C. Alexander Fleming
- D. Antonie van Leeuwenhoek
Explanation: Historical Perspectives Centennial: Koch's Discovery of the Tubercle Bacillus.
Correct answer: Robert Koch- A. Both processes produce four haploid cells
- B. Both processes are a form of asexual reproduction
- C. Both processes involve genetic recombination
- D. None of these options are correct
Explanation: Both bacterial conjugation and meiosis involve genetic recombination, which is the process of exchanging genetic material to create…
Correct answer: Both processes involve genetic recombination- A. Sporulation
- B. Fission
- C. Apomixis
- D. All of these options are correct
Explanation: All of the above given options are different mode of sexual reproduction in living beings.
Correct answer: All of these options are correct- A. Spirochete
- B. Escherichia coli (E. coli)
- C. Pseudomonas
- D. Campylobacter
Explanation: Option D: Campylobacter is the correct answer as it is a microaerophilic bacterium, requiring low levels of oxygen to survive and grow.
Correct answer: Campylobacter- A. Protection from enviroment
- B. Protection from engulfment
- C. Protection from osmotic lysis
- D. All of the above
Explanation: Capsule is tightly bound to the bacterial cell. It is a part of the cell envelope.
Correct answer: Protection from engulfment- A. Purple
- B. Red
- C. Pink
- D. Blue
Explanation: Gram-positive bacteria appear purple under Gram staining because they retain the crystal violet stain due to their thick peptidoglycan…
Correct answer: Purple2260. Chemical substances used on living tissues that inhibit the growth of microorganism are called?
- A. Disinfectant
- B. Sanitizer
- C. Antibiotic
- D. Antiseptics
Explanation: Antiseptics are specifically designed for use on living tissues to inhibit or kill microorganisms, making them the correct answer.
Correct answer: Antiseptics