Apentix/AP Biology/Unit 6: Gene Expression and Regulation/Question
AP Biologyeasymcq1 pt

Why are many point mutations located deep within introns neutral with respect to the encoded protein?

A.Much intronic sequence is removed during RNA processing and may not alter coding or splice-regulatory information
B.introns code for proteins
C.introns are made of RNA only
D.the mutation repairs itself

Explanation

Core Concept

Many intronic nucleotides are removed before translation and do not contribute directly to the protein-coding sequence, so mutations there may have no effect on the protein. However, introns also contain splice sites and regulatory elements; mutations affecting those regions can strongly alter gene expression or mRNA processing.

Correct Answer

AMuch intronic sequence is removed during RNA processing and may not alter coding or splice-regulatory information

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