The Question is from neet-botany molecular-basis-of-inheritance translation, and it was created by the author D VINOD

Question

If a cell lacked snRNAs, which of the following processes related to protein synthesis would be most directly affected?

D VINOD · Accepted Answer

## CORE INFORMATION
✓ **Answer**: Option A
## CONCEPT FRAMEWORK
 **Primary Concept**: Role of snRNAs in mRNA processing
 **Related Topics**: Spliceosomes, mRNA splicing, protein synthesis, gene expression
 **Prerequisites**: Understanding of transcription, translation, and RNA processing.
## SOLUTION PATHWAY
**Given Information**:
  The cell lacks small nuclear RNAs (snRNAs).
  We need to identify the process most directly affected in protein synthesis.
**Method & Steps**:
 1. Identify the function of snRNAs.
  Reasoning: snRNAs are crucial components of spliceosomes, the molecular machines that remove introns from pre-mRNA.
  Formula/Rule: None directly applicable.
 2. Determine the impact of lacking snRNAs on mRNA processing.
  Working: Without snRNAs, spliceosomes cannot form properly, leading to a failure in intron removal from pre-mRNA. This means that the pre-mRNA will not be correctly processed into mature mRNA, which is essential for translation.
  Key Point:  mRNA splicing is a critical step before translation can occur.
 3. Assess the effect on other protein synthesis processes.
  Result: While tRNA binding, ribosome assembly, and amino acid activation are also essential for protein synthesis, they are not directly impacted by the absence of snRNAs.  The lack of properly spliced mRNA would directly halt translation.
  Verification: The absence of functional spliceosomes due to a lack of snRNAs directly prevents the production of mature mRNA, making option A the most direct and significant consequence.
 ## OPTION ANALYSIS
[A] ✓: mRNA splicing and processing: snRNAs are essential components of spliceosomes, which are responsible for removing introns from pre-mRNA.  Without snRNAs, splicing is severely impaired, directly affecting protein synthesis.
[B] :x: tRNA binding to mRNA:  tRNA binding to mRNA occurs during translation, a downstream process.  While faulty mRNA may affect this, it's not the most direct effect of lacking snRNAs.
[C] :x: Ribosome assembly: Ribosome assembly is a separate process primarily involving ribosomal RNAs (rRNAs) and proteins.  snRNAs are not directly involved.
[D] :x: Amino acid activation: Amino acid activation is an early step in translation involving aminoacyl-tRNA synthetases.  It's not directly linked to snRNA function.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing snRNAs with other types of RNAs (rRNAs, tRNAs): Understanding the specific roles of each RNA type is crucial.
  2.Not fully appreciating the central role of mRNA splicing in protein synthesis:  Splicing is a prerequisite for translation.
 **Quick Tips**:
  1.Remember that snRNAs are key players in spliceosomes.
  2.Focus on the direct consequence of missing a crucial component in a specific process.

D VINOD · Answer

The correct Option is "mRNA splicing and processing"

D VINOD · Answer

tRNA binding to mRNA

D VINOD · Answer

Ribosome assembly

D VINOD · Answer

Amino acid activation

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