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. Protist
- B. Cyanobacteria
- C. Archaea
- D. Bacteria
Explanation: Methanopyrus kandleri is classified as an archaeon because it thrives in extreme environments, such as hydrothermal vents, where…
Correct answer: Archaea- A. Basal body
- B. Cell membrane
- C. Cell wall
- D. Capsule
Explanation: In prokaryotic cells, the flagella originate from the basal body, which is embedded in the cytoplasm and serves as the anchoring point for…
Correct answer: Basal body- A. Cytoplasm
- B. Ribosomes
- C. Flagella
- D. Peptidoglycan cell wall
Explanation: The presence of a peptidoglycan cell wall is a unique characteristic of most prokaryotic cells, distinguishing them from eukaryotic cells…
Correct answer: Peptidoglycan cell wall- A. Sulphur
- B. Oxygen
- C. Hydrogen
- D. Carbon dioxide
Explanation: Prokaryotes use H2S instead of water so they release sulphur, unlike plants and algae which use water as a hydrogen source and thus…
Correct answer: Sulphur- A. Flagella
- B. Pili
- C. Cilia
- D. Microtubules
Explanation: The correct answer is Flagella. Flagella are specialized structures that provide motility to bacteria by rotating like propellers…
Correct answer: Flagella- A. Peptidoglycan
- B. Respiratory enzymes
- C. Cholesterol
- D. Phospholipids
Explanation: Cholesterol is a lipid molecule that is an essential component of the plasma membrane in eukaryotic cells.
Correct answer: Cholesterol- A. Oxidation of proteins
- B. Coagulation of proteins
- C. Degeneration of nucleic acids
- D. Bursting up of cells
Explanation: Moist heat primarily kills microbes by causing the coagulation or denaturation of proteins.
Correct answer: Coagulation of proteins- A. Lipids
- B. Peptidoglycan
- C. Teichoic acid
- D. Lipoteichoic acid
Explanation: The correct answer is Lipids. Gram-negative bacteria have a unique cell wall structure characterized by an outer membrane rich in lipids…
Correct answer: Lipids- A. Nucleoids
- B. Mesosomes
- C. Chromatin Bodies
- D. Plasmids
Explanation: Plasmids are extrachromosomal DNA found in many bacteria and are known for carrying genes that can provide resistance to antibiotics.
Correct answer: Plasmids- A. Sulphur
- B. Phosphorus
- C. Calcium
- D. Magnesium
Explanation: Photosynthetic bacteria is mistakenly typed as photosynthesis bacteria. Option A: Sulphur is correct.
Correct answer: Sulphur- A. Cellulose & pectin
- B. Cellulose & cutin
- C. Hemicellulose & chitin
- D. Amino acid & sugar
Explanation: Amino acids and sugar is correct.Cell-wall of bacteria is totally different from ordinary plant cell-wall.
Correct answer: Amino acid & sugar- A. Mesosomes
- B. Peroxisomes
- C. Glyoxysomes
- D. Nucleosomes
Explanation: Mesosomes are invaginations of the cell membrane into the cytoplasm. Mesosomes are in the form of vesicles, tubules, or lamellae.
Correct answer: Mesosomes- A. Cell Wall
- B. Cell Membrane
- C. Plasmid
- D. Cysts
Explanation: Mesosomes were once thought to be infoldings of the plasma membrane found in some bacteria, particularly Gram-positive species, and were…
Correct answer: Cell Membrane- A. Increase pathogenicity of bacteria
- B. Degrade host plasma membrane
- C. Degrade host enzymes
- D. Exchange of genetic material
Explanation: Pili (singular: pilus) arehair-like appendages found on the surface of some bacterial cells.
Correct answer: Exchange of genetic material- A. 1
- B. 2
- C. 3
- D. 4
Explanation: In Gram-positive bacteria, there is only one major layer in the cell wall, while Gram-negative bacteria have two major layers in the cell…
Correct answer: 1- A. Cell wall
- B. Capsule
- C. Cell wall & slime
- D. Slime
Explanation: The bacterial cell wall is a rigid structure that provides structural support and helps maintain the shape of the bacterial cell.
Correct answer: Cell wall- A. Diplococcus pneumoniae
- B. Hyphomicrobium
- C. Escherichia coil
- D. Pseudomonas
Explanation: Hyphomicrobium is a genus of bacteria that exhibits a spiral or helical shape. It is known for its spiral or curved rod morphology.
Correct answer: Hyphomicrobium- A. Tincture of Iodine
- B. Potassium Permanganate
- C. Mercuric Chloride
- D. Hydrogen Peroxide
Explanation: **Tincture of iodine** (option A) is not typically used as a disinfectant to control bacterial growth.
Correct answer: Tincture of Iodine- A. 1
- B. 2
- C. 3
- D. 4
Explanation: In Gram-positive bacteria, there is only one major layer in the cell wall while hgram negative bacteria has two major layers.
Correct answer: 1- A. Lipids
- B. Carbohydrates
- C. Nucleotide
- D. Alcohol
Explanation: Option B is correct.The capsule of a bacterial cell is a sticky gelatinous structure made up of carbohydrates.
Correct answer: Carbohydrates