Deleting or inserting one nucleotide pair in the middle of a gene is an example of which of the following?
a. base substitution
b. nonsense mutation
c. frameshift mutation
d. missense mutation
Answer: c. frameshift mutation
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Tetanus develops from a puncture wound because
A) endospores germinate in anoxic conditions. B) the organism gains access to the circulatory system and then invades the nervous system. C) the organism digests deep connective tissues. D) the organism needs access to the circulatory system and deep connective tissues.
Cancer is caused by rapid cell division that results in tumor formation. Cancer cells often have
mutations in CDK genes. Explain how a mutation in a CDK might help lead to uncontrolled cell growth.
What will be an ideal response?A substance is most likely to diffuse into a cell when
(1) it is a large organic food molecule such as protein or starch (2) it is enclosed in an organelle such as a vacuole (3) the concentration of the substance is greater outside the cell than inside (4) the pH of the substance is greater than the pH of the cell
What is the name of the small gap that separates the axon terminal of a nerve from the sarcolemma?
A. sarcoplasmic reticulum B. synaptic vesicle C. T tubule D. synaptic cleft E. sliding filament