Chapter 9 -4 Flashcards Preview

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Flashcards in Chapter 9 -4 Deck (10):
1

What are some common gene mutations?

single base pair changes
base pair substitutions
insertions or deletions

2

What causes mutations?

mutagens
like nuclear radiation and transposable elements

3

What are transposable elements?

jumping DNA

4

What is jumping DNA a result of?

Neurofibromatosis (a genetic disorder developed from transposons)

5

What happens in elongation?

addition of amino acids by tRNA forming the polypeptide chain

6

What are the 3 parts of elongation?

1. codon recognition
2. peptide bond formation b/w the 2 a.a.'s
3. Translocation

7

What is translocation?

ribosome moves down mRNA

8

What happens in codon recognition?

complementary binding of tRNA to mRNA

9

What happens in termination?

a stop codon enters the ribosome UAG, UAA, UGA
No corresponding tRNA
A release factor (protein) binds

10

What does termination trigger?

hydrolysis which releases the mRNA, the polypeptide, and the ribosomal subunits