The Question is from neet-botany , and it was created by the author D VINOD

Question

Which of the following statements is not true for retroviruses?

D VINOD · Accepted Answer

## CORE INFORMATION
✓ **Answer**: A
## CONCEPT FRAMEWORK
	**Primary Concept**: Retrovirus Life Cycle
	**Related Topics**: Reverse Transcription, Viral Genetics, Cancer Biology
	**Prerequisites**: Basic understanding of viruses, central dogma of molecular biology, and retroviruses.
## SOLUTION PATHWAY
**Given Information**:
	* The question asks for the statement that is NOT true about retroviruses.
	* The options describe various aspects of retroviral biology.
**Method & Steps**:
	1.  Analyze each option based on knowledge of retroviruses.
		Reasoning: Retroviruses are known for their unique life cycle involving reverse transcription.
	2. Evaluate option A: 'DNA is not present at any stage in the life cycle of Retroviruses?'
		Working: Retroviruses use reverse transcriptase to convert their RNA into DNA (provirus) which is integrated into the host genome. Therefore, this statement is incorrect.
	3. Evaluate option B: 'Retroviruses carry gene for RNA-dependent DNA polymerase'
		Working: This is correct; reverse transcriptase is an RNA-dependent DNA polymerase.
	4. Evaluate option C: 'The genetic material in mature Retroviruses is RNA'
		Working: This is correct; mature retroviruses package RNA as their genome.
	5. Evaluate option D: 'Retroviruses are causative agents for certain kinds of cancer in men'
		Working: This is correct; some retroviruses are known to be oncogenic.
	6. Identify the incorrect statement.
		Result: Option A is the incorrect statement.
## OPTION ANALYSIS
[A] ✓: This is the correct answer. Retroviruses do have a DNA stage (provirus) in their life cycle. Reverse transcriptase makes a DNA copy of the RNA genome.
[B] :x: This statement is true. Retroviruses encode reverse transcriptase, an RNA-dependent DNA polymerase.
[C] :x: This statement is true. Retroviruses are RNA viruses.
[D] :x: This statement is true. Some retroviruses are known to be oncogenic.
## LEARNING AIDS
	**Common Mistakes**:
		1. Confusing retroviruses with other RNA viruses: Retroviruses are unique in their use of reverse transcriptase.
		2. Forgetting the provirus step: The DNA form of the retroviral genome (provirus) is crucial for their life cycle.
	**Quick Tips**:
		1. Remember 'retro' means backward; reverse transcription goes from RNA to DNA.
		2. Think of HIV as a key example of a retrovirus.

D VINOD · Answer

The correct Option is "DNA is not present at any stage in the life cycle of Retroviruses?"

D VINOD · Answer

Retroviruses carry gene for RNA-dependent DNA polymerase

D VINOD · Answer

The genetic material in mature Retroviruses is RNA

D VINOD · Answer

Retroviruses are causative agents for certain kinds of cancer in men

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