______ is a major component of cell membranes
Fill in the blank(s) with the appropriate word(s).
phospholipids
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A slight decrease in arterial below normal is a more potent stimulus toward increasing respiration than is a slight increase in above normal
Indicate whether the statement is true or false
A secondary spermatocyte is ______ with _______ chromosomes
a. haploid, nonreplicated b. haploid, replicated c. diploid, nonreplicated d. diploid, replicated. e. none of the above
Clonal selection occurs when:
A) plasma cells secrete antibodies. B) B cells undergo rapid mitosis. C) B cells are activated. D) B cells differentiate into plasma cells and memory B cells.
Which of the following blood vessels is a direct branch of the ascending aorta?
A) right subclavian artery B) left internal carotid artery C) right pulmonary artery D) left brachiocephalic artery E) right and left coronary arteries