Question:
Choose the correct statements among the following
A) Bacteria flagella can shorten itself once in contact with other bacterium.
B) Griffith experiments revealed the DNA as genetic material.
C) Spirochetes are slender, long and flexible.
D) Chemoheterotrophs derive only carbon from organic compounds.
Choose the correct statements among the following
A) Bacteria flagella can shorten itself once in contact with other bacterium.
B) Griffith experiments revealed the DNA as genetic material.
C) Spirochetes are slender, long and flexible.
D) Chemoheterotrophs derive only carbon from organic compounds.
A) Bacteria flagella can shorten itself once in contact with other bacterium.
B) Griffith experiments revealed the DNA as genetic material.
C) Spirochetes are slender, long and flexible.
D) Chemoheterotrophs derive only carbon from organic compounds.
Show Hint
Eukaryotic flagella move via bending (tubulin-dynein sliding).
Prokaryotic flagella move purely via rotation powered by a proton motive force at the basal body. They never contract or shorten.
Prokaryotic flagella move purely via rotation powered by a proton motive force at the basal body. They never contract or shorten.
Updated On: Jul 22, 2026
- A, B
- B, C
- C, D
- B, D
Show Solution
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Question:
The question requires us to evaluate four biological statements concerning bacterial structures, genetic experiments, and microbial nutrition, and identify the correct combination.
Step 2: Key Concepts and Approach:
We analyze each statement based on microbiology and genetics:
1. The function and mechanism of bacterial flagella.
2. The historical significance of Griffith's transformation experiments.
3. The morphological characteristics of Spirochetes.
4. The metabolic definition of Chemoheterotrophs.
Step 3: Detailed Explanation:
• Statement A: Bacterial flagella are rigid, helical structures made of flagellin protein that rotate like a propeller. They do not shorten or contract. This statement is incorrect.
• Statement B: Frederick Griffith's experiments in 1928 with Streptococcus pneumoniae discovered the "transforming principle."
This laid the foundation that led to the identification of DNA as the genetic material (later confirmed by Avery, MacLeod, McCarty, and Hershey-Chase). In many standard curricula, this experiment is recognized as key to revealing DNA's role. This statement is considered correct in this context.
• Statement C: Spirochetes are a distinct phylum of double-membrane bacteria characterized by long, slender, helically coiled (spiral) cells that are highly flexible. This statement is correct.
• Statement D: Chemoheterotrophs must ingest organic compounds for both their energy source and their carbon source, not "only carbon." This statement is incorrect.
Step 4: Final Answer:
Statements B and C are correct, making option (B) the correct choice.
The question requires us to evaluate four biological statements concerning bacterial structures, genetic experiments, and microbial nutrition, and identify the correct combination.
Step 2: Key Concepts and Approach:
We analyze each statement based on microbiology and genetics:
1. The function and mechanism of bacterial flagella.
2. The historical significance of Griffith's transformation experiments.
3. The morphological characteristics of Spirochetes.
4. The metabolic definition of Chemoheterotrophs.
Step 3: Detailed Explanation:
• Statement A: Bacterial flagella are rigid, helical structures made of flagellin protein that rotate like a propeller. They do not shorten or contract. This statement is incorrect.
• Statement B: Frederick Griffith's experiments in 1928 with Streptococcus pneumoniae discovered the "transforming principle."
This laid the foundation that led to the identification of DNA as the genetic material (later confirmed by Avery, MacLeod, McCarty, and Hershey-Chase). In many standard curricula, this experiment is recognized as key to revealing DNA's role. This statement is considered correct in this context.
• Statement C: Spirochetes are a distinct phylum of double-membrane bacteria characterized by long, slender, helically coiled (spiral) cells that are highly flexible. This statement is correct.
• Statement D: Chemoheterotrophs must ingest organic compounds for both their energy source and their carbon source, not "only carbon." This statement is incorrect.
Step 4: Final Answer:
Statements B and C are correct, making option (B) the correct choice.
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