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. Nuclear body
- B. Nuclear region
- C. Nucleoid
- D. All of the Above
Explanation: The correct term for the chromatin body in prokaryotes is 'nucleoid'. This is the specific region within the cytoplasm where the genetic…
Correct answer: Nucleoid- 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 gram-negative bacteria
- D. Both have equal amounts of lipids
Explanation: Gram-negative bacteria have a unique cell wall structure that includes an outer membrane rich in lipopolysaccharides (LPS), leading to a…
Correct answer: Gram-negative bacteria have more lipids in their cell wall- A. Beta-proteobacteria
- B. Alpha-proteobacteria
- C. Gamma-proteobacteria
- D. Delta-proteobacteria
Explanation: The correct answer is Gamma-proteobacteria. This group includes sulfur bacteria that oxidize hydrogen sulfide (H2S) to obtain energy…
Correct answer: Gamma-proteobacteria- A. Archaeobacteria
- B. Eubacteria
- C. Mycoplasma
- D. Cyanobacteria
Explanation: Mycoplasmas are unique among prokaryotes due to their lack of a cell wall, which gives them flexibility and resistance to certain…
Correct answer: Mycoplasma- A. 0.5-1.5
- B. 2.0-4.0
- C. 1.1-1.5
- D. 2.0-6.0
Explanation: The correct diameter range for E. coli is 1.1-1.5 micrometers, as E. coli cells are typically around this size.
Correct answer: 1.1-1.5- A. Bacilli
- B. Staphylobacillus
- C. Bacillus
- D. Diplobacilli
Explanation: The correct answer is Bacillus. A single rod-shaped bacterium is known as a bacillus.
Correct answer: Bacillus- A. Heterotrophic bacteria
- B. Chemosynthetic bacteria
- C. Saprophytic bacteria
- D. Parasitic bacteria
Explanation: Nitrifying bacteria are the examples of chemosynthetic bacteria. Nitrifying bacteria are a group of bacteria that plays a crucial role in…
Correct answer: Chemosynthetic bacteria- A. Chitin
- B. Cellulose
- C. Peptidoglycan
- D. Pectin
Explanation: A cell wall is defined as a rigid external layer that is specifically designed to provide structural support and rigidity.Diagram:
Correct answer: Peptidoglycan- 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 innoculated into a suscepticle animal
- D. It is possible to recover the organisms in pure culture from an experimentally infected animal
Explanation: The germ theory of disease states that some diseases are caused by microorganisms.
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. Epulophiscuim fishelsoni
Explanation: Staphylococci and Streptococci are 0.75 - 1.25n in diameter. The average size of staphylococci and streptococci can vary slightly…
Correct answer: Staphylococci and Streptococci- A. Flagella
- B. Pilli
- C. Cilia
- D. Microtubules
Explanation: Flagella are long, whip-like structures that many microorganisms, including bacteria and some single-celled eukaryotes, use for…
Correct answer: Flagella- A. Bacteria
- B. Fungi Cell
- C. Algae
- D. Cortex cells
Explanation: The description of a cell wall containing polysaccharide chains linked with short chains of amino acids is characteristic of bacterial…
Correct answer: Bacteria- A. Bacilli
- B. Cocci
- C. Vibrio
- D. Sarcina
Explanation: Rod-shaped bacteria are known as bacilli. They are one of the two main shapes of bacteria, the other being cocci (spherical bacteria).
Correct answer: Bacilli- A. Gram-positive
- B. Gram positive & Gram negative
- C. Gram-negative
- D. Capsule
Explanation: If lipopolysaccharides (LPS) did not appear in the wall of bacteria on staining, it would be known as Gram-positive bacteria.
Correct answer: Gram-positive- A. Mycoplasmas
- B. Gram negative bacteria
- C. Gram positive bacteria
- D. Archaeobaeteria
Explanation: CV-1 complex is formed during Gram staining in Gram-positive bacteria. The Gram stain is a method of differentiating between two main…
Correct answer: Gram positive bacteria- A. It arises from basal body
- B. It is involved in chemotaxis
- C. It is proteinaceous in nature
- D. It is responsible for conjugation
Explanation: The bacterial flagellum is not responsible for conjugation. Conjugation is a type of horizontal gene transfer in which DNA is transferred…
Correct answer: It is responsible for conjugation- A. Capsule
- B. Secondary wall
- C. Slime capsule
- D. Saculus
Explanation: The sacculus is the rigid layer that forms the outermost part of the cell wall in bacteria.
Correct answer: Saculus- A. Penecillium
- B. Bacterium
- C. Adiantum
- D. Polytrichum
Explanation: Bacteria contain a peptidoglycan cell wall. Peptidoglycan is a specific structural component of bacterial cell walls, and it is not found…
Correct answer: Bacterium- A. Lophotrichous
- B. Peritrichous
- C. Monotrichous
- D. Amphitrichous
Explanation: Amphitrichous is a condition when a tuft of flagella at each of two poles is present.
Correct answer: Amphitrichous- A. Both are same in size
- B. Both are involved in locomotion
- C. Both are composed of proteins
- D. All of above
Explanation: Both pili and flagella are composed of proteins, but they are made up of different proteins.
Correct answer: Both are composed of proteins