Free Kingdom Prokaryotae MCQs with Answers

141. "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".

142. 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.

143. 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.

144. 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.

145. 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.

146. 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.

147. 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.

148. 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 cell wall has a thin peptidoglycan layer and an outer membrane. Hence, all the given options are correct.

149. Which true prokaryote is a photosynthetic bacterium?

• A. Cyanobacteria
• B. Nostoc
• C. Chlorella
• D. E. coli

Explanation: Cyanobacteria are known as blue-green algae and are true photosynthetic bacteria.

150. Robert Koch discovered bacteria that cause?

• 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 responsible for tuberculosis (1882) and cholera (1883).