Summarize some factors known to influence mutation rates of genes
What will be an ideal response?
If mutations can occur at any base pair in a gene, then larger genes are more likely to undergo
mutation. Some genes contain clusters of short nucleotide sequences called trinucleotide repeats, and it appears that trinucleotide repeats may predispose genes to higher rates of mutation. Other factors, including spontaneous chemical changes by alternate chemical forms of the bases in DNA are also important. These chemical changes can occur spontaneously or be induced by environmental agents.
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Messenger RNA is:
a. information copied or transcribed from DNA. b. comprised of rRNA. c. comprised of tRNA. d. referenced by DNA. e. used by cells to communicate with each other.
Which is not a lipid?
A. a sterol B. a phospholipid C. a triglyceride D. a starch E. a wax
An inducible operon is usually controlled by:
a. an inducer molecule that keeps it in the "off" state. b. an active repressor that keeps it in the "off" state. c. being active at all times. d. allolactose. e. being turned "off," usually by the end product of the pathway
Figure 2.5A
Based on its outer shell, the atom in the accompanying figure would be characterized as ____.
A. very stable B. somewhat stable C. somewhat unstable D. very unstable E. radioactive