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. Transduction
- B. Transformation
- C. Binary Fission
- D. Conjugation
Explanation: Option B is correct since the transformation is the process of transmitting genetic information from one bacterium to another bacterium…
Correct answer: Transformation- A. 20 to 2000 times
- B. 10 to 1000 times
- C. 500 times
- D. 3000 times
Explanation: Viruses are 10 to 1000 times smaller than the smallest bacteria. The smallest bacteria, mycoplasma has a size of approximately 0.2 - 0.3 μm.
Correct answer: 10 to 1000 times- A. Both B and D
- B. Facultative anaerobe
- C. Constitutive aerobe
- D. Obligate anaerobe
Explanation: Obligate Anaerobe organisms cannot survive in the presence of oxygen. It lacks the necessary enzymes and metabolic pathways to utilize…
Correct answer: Obligate anaerobe- A. Microbiology and Genetics
- B. Genetics and Medicines
- C. Microbiology and Medicines
- D. Pathology and Genetics
Explanation: A. Microbiology and Genetics (Incorrect): Louis Pasteur's major discoveries were in microbiology and not specifically in genetics. B.
Correct answer: Microbiology and Medicines- A. Tetrad
- B. Sarcina
- C. Grape like clusters
- D. All of the above options are correct
Explanation: Option A; cells in a square arrangement, tetrads.Option B: The cocci are arranged in a cuboidal manner, as the cells are formed by regular…
Correct answer: Sarcina- A. Escherichia coli
- B. Mycoplasma
- C. Epulopiscium
- D. Spirochetes
Explanation: Some spirochetes occasionally reach 500 micrometres in length.
Correct answer: Spirochetes- A. Purple
- B. Red
- C. Pink
- D. Blue
Explanation: Gram-positive bacteria are bacteria with thick cell walls. In a Gram stain test, these organisms yield a positive result.
Correct answer: Purple- A. Cowpox
- B. Smallpox
- C. Rabies
- D. HIV
Explanation: In summary, Louis Pasteur discovered the vaccine against rabies (option C), making a groundbreaking contribution to the field of…
Correct answer: Rabies- A. Lactic acid
- B. Urea
- C. Ammonia
- D. Uric acid
Explanation: Lactic acid is indeed a common waste product produced by certain bacteria, particularly lactic acid bacteria, during a specific metabolic…
Correct answer: Lactic acid- A. Edward Jenner
- B. Leeuwenhoek
- C. Alexander Fleming
- D. Louis Pasteur
Explanation: Louis Pasteur developed a vaccine for anthrax in 1881. So opt D is correct.
Correct answer: Louis Pasteur- A. 50S+40S
- B. 60S+40S
- C. 80S
- D. 70S
Explanation: Is wrong because in eukaryotes 40S and 60S subunit s of ribosomes combine to form single subunit 80S
Correct answer: 70S- A. Anaerobic
- B. Facultative anaerobic
- C. Aerobic
- D. Obligate aerobic
Explanation: Option B is correct. E. coli is classified as a facultative anaerobe. It uses oxygen and grows by aerobic respiration when it is present…
Correct answer: Facultative anaerobic- A. Basal body
- B. Cell membrane
- C. Cell wall
- D. Capsule
Explanation: Option A is correct as cilia and flagella originate from their basal bodies embedded in the cytoplasm.
Correct answer: Basal body- A. Mitochondria
- B. RNA
- C. Ribosomes
- D. Plasma membrane
Explanation: Prokaryotes lack cell membrane-bound organelles, they do not contain mitochondria.
Correct answer: Mitochondria- A. Gram-positive bacteria
- B. Gram-negative bacteria
- C. Chemo-synthetic bacteria
- D. None of above
Explanation: Pilli is more common in gram-negative bacteria. Pili are long, filamentous appendages that protrude from the surface of bacteria and are…
Correct answer: Gram-negative bacteria- A. Transformation
- B. Conjugation
- C. Transduction
- D. All of these
Explanation: Based on the explanations provided, the correct answer to the question is option D) All of these.
Correct answer: All of these- A. Absence of DNA
- B. Absence of nucleus
- C. Absence of cell wall
- D. Absence of plastids
Explanation: Prokaryotic cells have their nucleic material naked in the cytoplasm, so no nuclear envelope present, thus no nucleus.
Correct answer: Absence of nucleus- A. Nuclear body
- B. Nuclear region
- C. Nucleoid
- D. All of Above
Explanation: Prokaryotic chromosomes are naked in the cytoplasm. Chromatin body is the place where it is present and can be termed as all of the…
Correct answer: All of Above- A. Transduction
- B. Transformation
- C. Binary fission
- D. Conjugation
Explanation: Transformation is a process by which bacteria make up and incorporate foreign DNA from their environment.
Correct answer: Transformation- A. Nuclei
- B. Cell wall
- C. Ribosomes
- D. Plasma membrane
Explanation: 'E. Coli', a bacterium, is a prokaryote that lacks a true nucleus. Instead, they have a nucleoid, the chromosome with its associated…
Correct answer: Nuclei