The variability among polypeptides is primarily due to:
A) noncovalent interactions within the molecule
B) addition of a phosphate group
C) the length of the polypeptide chain
D) the diverse side chains on the different amino acids
E) the addition of sulfate groups to some amino acids
Ans: D) the diverse side chains on the different amino acids
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To cultivate Francisella in the laboratory, a medium supplemented with which of the following ingredient(s) is necessary?
a. Cysteine and cystine b. Blood and cysteine c. Dopa-cysteine d. Nicotinic adenine
Microbial ________ focuses on the nature of heredity and how it regulates the development and function of cells and organisms.
Fill in the blank(s) with the appropriate word(s).
Equilibrial species are shaped by ____, and tend to have a ____
a. K-selection; small body and short generation time b. r-selection; large body and long generation time c. K-selection; large body and long generation time d. r-selection; small body and long generation time
e. r-selection; large body and short generation timeAlthough some sharks close their eyes just before they bite, their bites are on target. Researchers have noted that sharks often misdirect their bites at metal objects and that they can find batteries buried under sand
This evidence suggests that sharks keep track of their prey during the split second before they bite in the same way that a _____. A) rattlesnake finds a mouse in its burrow B) male silkworm moth locates a mate C) bat finds moths in the dark D) platypus locates its prey in a muddy river