Free Biodiversity and Variety of Life MCQs with Answers

2171. Which of the following is not correct for bacterial flagellum?

• A. It arises from the basal body
• B. It is involved in chemotaxis
• C. It is proteinaceous in nature
• D. It is responsible for conjugation

Explanation: This option is incorrect because the bacterial flagellum is not responsible for conjugation. Conjugation is a type of horizontal gene transfer in which DNA is transferred from one bacterium to another. The DNA is transferred through a pilus, which is a long, thin protein structure that is produced by one of the bacteria. The pilus attaches to bacterium, and DNA is then transferred through the pilus.

2172. Which of the following contains peptidoglycan cell wall?

• A. Penicillium
• B. Bacterium
• C. Adiantum
• D. Polytrichum

Explanation: Bacteria have cell walls that contain peptidoglycan, a unique structural molecule that distinguishes them from fungi, plants and other organisms.

2173. Cyanobacteria have which of the following type of cell wall?

• A. Gram-positive
• B. Gram-negative
• C. Cellulose
• D. Acid fast

Explanation: This is the correct option because cyanobacteria have a cell wall structure characteristic of Gram-negative bacteria. Their cell walls contain a thin peptidoglycan layer surrounded by an outer membrane, which is typical of gram negative bacteria.

2174. "Prokaron" means before nucleus is word of_ language.

• A. Dutch
• B. Greek
• C. Roman
• D. Spanish

Explanation: The term prokaryote comes from the Greek (pro) meaning "before" and (karyon) meaning "nut or kernel".

2175. Microbiologist place bacteria in following major categories:

• A. Archaeobacteria and vibrio bacteria
• B. Eubacteria and Streptococcus
• C. Eubacteria and Archaeobacteria
• D. Cyanobacteria and Archaeobacteria

Explanation: Microbiologists classify bacteria into two major categories: Eubacteria, which means "true bacteria, and the smaller group called Archaeobacteria, meaning ancient bacteria.

2176. The mode of reproduction for cyanobacteria is which of the following?

• A. Mitosis
• B. Binary fission
• C. Meiosis
• D. Conjugation

Explanation: Cyanobacteria, like most prokaryotes, reproduce primarily by binary fission, a simple and efficient method of reproduction.

2177. Which of the following is found in bacterial cells, but not in mature RBCs?

• A. Nucleus
• B. DNA
• C. Cell membrane
• D. Mitochondria

Explanation: This option is correct because a Bacterial cell does contain its genetic material in its nucleoid but it is absent in mature erythrocytes.

2178. Archaeobacteria can survive at which of the following temperature? (Celsius)

• A. 300
• B. 120
• C. 150
• D. 200

Explanation: Archaeobacteria are known for their ability to survive extreme environments, including high-temperature habitats. Some thermophilic archaea can survive temperatures around 120°C or even higher, but not all archaea can tolerate such high temperatures.

2179. In what category of bacteria does Neisseria most likely fall?

• A. Cocci
• B. Bacilli
• C. Spirochete
• D. None of these

Explanation: Cocci are spherical or roughly spherical bacteria. Neisseria falls under this category as it is a Gram-negative cocci specifically diplococci.

2180. Cell wall of a bacterial cell is more permeable in:

• A. Gram positive bacteria
• B. Gram negative bacteria
• C. Both A & B
• D. Mycoplasmas

Explanation: Gram positive bacteria is more permeable as outer membrane is absent, so this is correct.