Because of its unique structure, mutations on the Y chromosome:
A. are accumulated within individual Y
chromosome lineages.
B. generally only affect male reproductive
structure and function.
C. are helpful for mapping genes.
D. are shared only with specific regions of the
X chromosome.
E. happen only rarely.
A
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Why can scratching or chipping the seed coat speed up the germination of hard-coated seeds like alfalfa?
A. The mechanical stress activates hydrolytic enzymes. B. Water and oxygen can enter the seed to reach the embryo more quickly. C. Carbon dioxide can enter the seed and stimulate photosynthesis. D. Bacteria or fungi can enter the seed and release growth factors. E. Damage to the seed coat triggers the aleurone layer to release amylase.
The coronary vessels
a. supply and drain the heart muscle. b. bypass the heart ventricles. c. send blood directly to the lungs. d. are not really necessary because the heart can get its blood supply from the "inside." e. lead directly from the atria to the ventricles.
In 1884, Elie Metchnikoff observed blood cells collected around a splinter inserted in a sea star embryo. This was the discovery of
a. blood cells. b. sea stars. c. phagocytosis. d. immunity. e. none of the above
The classification of prokaryotes in Bergey's Manual of Systematic Bacteriology is largely based on
A. Gram stain reaction. B. habitat. C. type of electron receptor used in cellular respiration. D. rRNA sequences. E. cellular morphology.