A key derived character of sharks and rays that distinguishes them from ray-finned fishes is
A) jaws and a swim bladder.
B) vertebrae.
C) calcified (hard) bones.
D) a skeleton made of cartilage
Answer: D
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Aquaporins are proteins that control the passage of water molecules across a cell membrane. The protein forms a pore, or opening, in the membrane. You isolate what you think are two different molecules of aquaporin
, and determine that one of the proteins has a larger pore diameter than the second. Which of the following do you conclude? A) These two forms of aquaporin will have identical sequences of amino acids. B) These two forms of aquaporin will have different sequences of amino acids. C) You will have to sequence the proteins to compare their primary structure, because it should have no effect on pore diameter. D) These two forms of aquaporin have identical primary structure but differ in their tertiary structure.
Plasmid cloning vector DNA is usually introduced into bacterial hosts by
A. ligation. B. transformation. C. plasmolysis. D. transduction.
Proteins are made in the ____________________, but are present in all parts of the cell. Fill in the blank(s) with the appropriate word(s)
The cardinal sign of overhydration is:
A) edema. B) dyspnea. C) hypertension. D) tachycardia.