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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2181. E. coli is a:
- A. Facultative
- B. Anaerobic
- C. Gram-negative
- D. All of these
Explanation: Escherichia coli (E. coli) is facultative anaerobe. it is anaerobic in the absence of oxygen, and it is also Gram-negative because its…
Correct answer: All of these- A. Cyanobacteria
- B. Nostoc
- C. Chlorella
- D. E. coli
Explanation: Cyanobacteria are known as blue-green algae and are true photosynthetic bacteria.
Correct answer: Cyanobacteria- A. Tuberculosis and typhoid
- B. Tuberculosis and measles
- C. Tuberculosis and cholera
- D. All of the above
Explanation: German physician Robert Koch was one of the founders of bacteriology. He discovered the anthrax disease cycle (1876) and the bactana…
Correct answer: Tuberculosis and cholera- A. Single cell
- B. Chain of bacilli
- C. Pairs of bacilli
- D. All of the above
Explanation: Streptobacillus is a type of bacteria that appears in the form of a chain of rod-shaped cells (bacilli).
Correct answer: Chain of bacilli- A. Eubacteria
- B. Archaeobacteria
- C. Animalcules
- D. Prokaryote
Explanation: This option is correct because Animalcule (little animal', from Latin animal-the diminutive suffix-culum) is an old term for microscopic…
Correct answer: Animalcules- A. A specific organism can always be found associated with a disease
- B. The organism cannot be isolated and grown in a pure culture in the laboratory
- C. The pure culture will produce the disease when inoculated into a susceptible animal
- D. It is possible to recover the organisms in pure culture from an experimentally infected animal
Explanation: This statement is not correct as organisms can be isolated and grown pure culture.
Correct answer: The organism cannot be isolated and grown in a pure culture in the laboratory- A. E. Coli
- B. Staphylococci and Streptococci
- C. Spirochetes
- D. Epulopiscium fishelsoni
Explanation: Staphylococci and Streptococci are 0.75-1.25 micrometer in diameter.
Correct answer: Staphylococci and Streptococci- A. Gram-positive bacteria-peptidoglycan
- B. Gram-positive bacteria-lipids
- C. Gram-negative bacteria-no outer membrane
- D. Gram-negative bacteria-less permeable
Explanation: Gram-negative bacteria have an outer membrane of lipoprotein which is absent in gram-positive bacteria.
Correct answer: Gram-negative bacteria-no outer membrane- A. Stationary phase
- B. Lag phase
- C. Log phase
- D. Death phase
Explanation: In this phase, bacteria are actively dividing and growing at their maximum rate.
Correct answer: Log phase- A. On the anterior side
- B. Over a single dimension
- C. In width
- D. In thickness
Explanation: Bacteria range in size from about 0.1 to 600µm over a single dimension, which is the ir length.
Correct answer: Over a single dimension- A. Discoloration of teeth in young children
- B. Dumbness
- C. Allergic reactions
- D. Discoloration of teeth in young children, causing deafness and allergic reactions
Explanation: Misuse of antibiotics can cause various side effects and issues. but it does not cause "dumbness".
Correct answer: Dumbness- A. Deafness
- B. Death
- C. Allergic reactions
- D. Discoloration of teeth
Explanation: Misuse of streptomycin can lead to irreversible damaga to the auditory nerve, causing hearing loss or deafness.
Correct answer: Deafness- A. Spindle-shaped bacteria
- B. Filamentous bacteria
- C. Lobed bacteria
- D. Spindle-shaped, Filamentous, Lobed, and Star-like bacteria
Explanation: These forms represent exceptions to the basic bacterial shapes of cocci (round), bacilli (rod-shaped), and spirilla [helical.
Correct answer: Spindle-shaped, Filamentous, Lobed, and Star-like bacteria- A. Microbistatic approach
- B. Microbicidal approach
- C. Bactericidal approach
- D. Antenatal approach
Explanation: Reproductive capacities of the cells are inhibited and the population of microbes is maintained at constant size by microbistatic.
Correct answer: Microbistatic approach- A. Robert Koch
- B. Antonie van Leeuwenhoek
- C. Robert Hooke
- D. Robert Brown
Explanation: Proposing the germ theory of disease was the crowning achievement of the French scientist Robert Koch.
Correct answer: Robert Koch- A. Cocci
- B. Bacilli
- C. Spirilla
- D. None of these
Explanation: Bacteria are classified according to their shape, or morphology. Spherical bacteria are known as cocci, rod-shaped bacteria are bacilli…
Correct answer: Bacilli- 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
Explanation: This means that they both involve the mixing of genetic material from two different cells.
Correct answer: Both processes involve genetic recombination- A. Vinegar
- B. Saliva
- C. Rain water
- D. All of Above
Explanation: Correct option is C. Anton Van Leeuwenhoek is known as the father of microbiology due to his findings with his novel microscopes.
Correct answer: Rain water- A. Staphylococci
- B. Pseudomunas
- C. Diplococcus pneumonia
- D. Mycoplasmas
Explanation: Correct option is D. Examples of bacteria that lack a cell wall are Mycoplasma and L-form bacteria.
Correct answer: Mycoplasmas- A. Cellulose
- B. Chitin
- C. Silica waxes and lignin
- D. Peptidoglycan or murein
Explanation: Prokaryotic cell wall; It lacks cellulose. Its strengthening material is peptidoglycan or murein.
Correct answer: Peptidoglycan or murein