Biology: How Life Works
3rd Edition
ISBN: 9781319017637
Author: James Morris, Daniel Hartl, Andrew Knoll, Melissa Michael, Robert Lue, Andrew Berry, Andrew Biewener, Brian Farrell, N. Michele Holbrook
Publisher: Macmillan Higher Education
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Chapter 14.3, Problem 8SAQ
Summary Introduction
A change in the DNA sequence of the cell is known as a mutation. Mutations often occur in two ways such as spontaneous mutations (which arise occasionally) and induced mutations (which arise from the exposure of mutagens). Mutations affect the
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What are the types of mutations, and how does each alter theencoded protein?
What type of mutations are insertions and deletions?
• What causes mutation? Is it always harmful?
• Does a simple change on DNA sequence affect the resulting protein? Explain briefly.
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- What are the three modifications made to pre-mRNA molecules before they become mature mRNAs, are transported from the nucleus to the cytoplasm, and become ready to be used in protein synthesis? What is the function of each modification?arrow_forwardWhat is a mutation? How does a mutation lead to an altered phenotype? Describe two specific types of mutations.arrow_forwardWhat is the mRNA, amino acid, and type of mutationarrow_forward
- What three different types of mutations involve changes in a single base, and what effect can each of them have on a coding sequence? Which type is the most common? Which type has the most severe effect on the function of the encoded protein?arrow_forwardWhat is the difference between a missense mutation and a nonsense mutation? Between a silent mutation and a neutral mutation?arrow_forwardWhy do some genetic mutations lead to completely nonfunctional proteins while others do not affect the functioning of the resulting protein at all?arrow_forward
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