How is it that people can donate blood plasma twice per week?
A. Plasma only contains fluid and dissolved substances such as proteins that can be rapidly replaced.
B. Plasma contains platelets which can be replaced quickly.
C. Plasma contains red blood cells which can be replaced quickly.
D. Plasma contains only water and can be rapidly replaced.
E. Plasma is regenerated from the blood cells injected back into the donor.
A. Plasma only contains fluid and dissolved substances such as proteins that can be rapidly replaced.
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When examining ice cores for seasonal information, the summer layers appear __________
because the ice there is __________ dense.
a. dark; less b. dark; more c. light; less d. light; more
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Which molecule catalyzes covalent bond formation between fragments of DNA?
A. nuclease B. helicase C. primase D. ligase E. polymerase