Free Kingdom Prokaryotae MCQs with Answers

331. Cell wall is only absent in which of the following group of bacteria?

• A. Staphylococci
• B. Pseudomonas
• C. Diplococcus pneumonia
• D. Mycoplasmas

Explanation: Based on the explanations provided, the correct answer to the question is option D) Mycoplasmas. Mycoplasmas are the only group of bacteria that lack a cell wall.

332. Which of the following structure is not present in all bacteria?

• A. Cell membrane
• B. Chromatin
• C. Ribosome
• D. Capsule

Explanation: Based on the explanations provided, the correct answer to the question is option D) Capsule. The capsule is not present in all bacteria, unlike the cell membrane, ribosome, and bacterial DNA (nucleoid region), which are universal features of bacterial cells.

333. Which of the following is not a method of genetic recombination in bacterium?

• A. Conjugation
• B. Transformation
• C. Transduction
• D. Binary Fission

Explanation: Based on the explanations provided, the correct answer to the question is option D) Binary Fission. Binary fission is not a method of genetic recombination but rather a form of asexual reproduction used by bacteria to produce identical copies of themselves.

334. Which of the following bacteria do not commonly have flagella?

• A. Cocci
• B. Bacilli
• C. Streptobacillus
• D. Vibrio

Explanation: Based on the explanations provided, the correct answer to the question is option A) Cocci. Cocci bacteria do not commonly have flagella. While some bacilli (option B) and vibrio bacteria (option D) may have flagella, the presence of flagella in cocci is less common. Streptobacillus (option C) is a type of bacillus and may or may not have flagella, depending on the species.

335. What allows bacteria to stain positively with gram stain?

• A. The bacteria is anaerobic
• B. The bacterial sample was pretreated with 3% ethanol
• C. The bacteria's periplasmic space
• D. The bacteria's thick peptidoglycan cell walls

Explanation: Based on the explanations provided, the correct answer to the question is option D) The bacteria's thick peptidoglycan cell walls. The presence of thick peptidoglycan in the cell wall allows bacteria to stain positively with the Gram stain, appearing purple.

336. Flagella are basically composed of?

• A. Protein
• B. Enzyme
• C. Chemical
• D. None of above

Explanation: Flagella is composed of protein flagellin.

337. Characteristic of prokaryotic cells?

• A. Absence of membrane bound cell organelles
• B. Absence of nucleus
• C. Presence of 70S ribosomes
• D. All of these

Explanation: Prokaryotes lack membrane-bound organelles such as mitochondria. They do not contain a nucleus as there is no membrane separating the nuclear contents from the cytoplasm so, the nucleus is absent in prokaryotes. Prokaryotes do contain ribosomes and they are smaller than those in eukaryotes. Prokaryotes contain 70s while eukaryotes contain 80s ribosomes. All of these are characteristics of prokaryotes.

338. The function of cell wall in prokaryotes is:

• A. To give cells rigidity
• B. To give specific shape
• C. To protect from osmotic lysis
• D. All of the above

Explanation: The cell wall provides structural support to the cell, preventing it from collapsing under its internal pressure. It also determines the shape of the cell, which can vary depending on the species of prokaryote. The cell wall also prevents the cell from bursting due to the osmotic pressure of the surrounding environment. All of these are characteristics of the cell wall.

339. True bacteria are termed as:

• A. Eubacteria
• B. Archaeobacteria
• C. Cyanobacteria
• D. None of above

Explanation: Eubacteria, also known as true bacteria or bacteria, are a major group of prokaryotic microorganisms. They are characterized by their cell walls containing peptidoglycan and their ability to live in various environments.

340. A type of bacterial cell that completely surrounded by flagella is called:

• A. Diplococcus
• B. Tetrad
• C. Peritriehous
• D. Monotrichous

Explanation: A type of bacterial cell that is completely surrounded by flagella is called peritrichous. The flagella are arranged in a spiral or tuft around the cell, and they help the cell to move.