A researcher has developed two stains for use with seed plants. One stains sporophyte tissue blue; the other stains gametophyte tissue red
If the researcher exposes pollen grains to both stains, and then rinses away the excess stain, what should occur? A) The pollen grains will be pure red.
B) The pollen grains will be pure blue.
C) The pollen grains will have red interiors and blue exteriors.
D) The pollen grains will have blue interiors and red exteriors.
C
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Older roots become thick and woody through the buildup of ____
a. periderm b. meristem c. cork cambium d. vascular cambium e. pericycle
A friend asks you to explain the difference between atherosclerosis and arteriosclerosis. You say, "Well
A. atherosclerosis and arteriosclerosis are nearly the same and usually occur after a stroke." B. atherosclerosis is a condition that results from having angina pectoris occurring in the arteries of the heart, while arteriosclerosis results from the accumulation of cholesterol deposits in the arteries." C. atherosclerosis is a condition that results from the accumulation of cholesterol deposits in the arteries, while arteriosclerosis results from too much calcium being deposited in the arteries." D. atherosclerosis is a condition that results from too much calcium being deposited in the arteries, while arteriosclerosis results from the accumulation of cholesterol deposits in the arteries." E. atherosclerosis is a condition that results from too much calcium being deposited in the arteries, while arteriosclerosis results from having angina pectoris occurring in the arteries of the heart."
The number of similarities in certain DNA or RNA nucleotide or amino acid sequences may be used
as a molecular clock to indicate how much time has passed since the groups branched from a common ancestor. __________________ Indicate whether the statement is true or false.
Chromosomes "decondense" into diffuse chromatin
a. at the end of telophase. b. at the beginning of prophase. c. at the end of interphase. d. at the end of metaphase. e. only in dying cells.