The genetic code is:
a. different for bacteria than for eukaryotes.
b. redundant.
c. ambiguous.
d. comprised of codons which usually differ at the first position.
e. a quadruplet code.
Ans: b. redundant.
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Cortisol is a ____ secreted by the ____
a. amine; adrenal medulla b. glucocorticoid; adrenal cortex c. glucocorticoid; adrenal medulla d. amine; adrenal cortex e. catecholamine; adrenal glands
In addition to the deposit feeding brittle stars pictured, what other type of organism is abundant in this photograph?
1.sea cucumbers
2.urchins
3.bivalves
4.sea stars
The structure labeled 3 in Figure 35-2 is:
a. the secondary xylem.
b. formed by the division of the vascular cambium.
c. found adjacent to the pith.
d. usually referred to as wood.
e. the cork cambium.
What is the MOST common type of mutation involving single base pairs?
A. frameshift mutation B. nonsense mutation C. missense mutation D. base substitution