If a woman with AB blood marries a man with AB blood, what percentage of offspring would have O blood?
a. 0%
b. 50%
c. 75%
d. 100%
a. 0%
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The only endocrine gland whose secretory function is under direct control by sympathetic nerves is the:
a. pancreas b. thyroid c. adrenal medulla d. thymus e. testis
The net primary productivity is the amount of energy
A. trapped by the autotrophs of an ecosystem. B. given off as heat by producers. C. available for consumers. D. used in metabolism by producers. E. Both given off as heat by producers and trapped by the autotrophs of an ecosystem are correct.
The fluid mosaic model proposed by Singer and Nicolson in 1972 explained that
A. the cell membrane was composed of lipids and proteins. B. the cell membrane was composed of a phospholipid bilayer but the polar ends of the phospholipid molecules were reversed. C. the cell membrane was composed of a phospholipid bilayer between two layers of globular proteins. D. the cell membrane was composed of a phospholipid bilayer with globular proteins actually inserted into the bilayer.
Which structure is associated with the outer ear?
A. tympanic membrane B. round ear C. cochlea D. semicircular canals E. auditory canal