The replication of a DNA molecule during interphase occurs during the
A. first "gap" phase.
B. S phase.
C. metaphase.
D. generation "gap" phase.
E. second "gap" phase.
Answer: B
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Sam has had two large bottles of water to drink today, about 1,500mL of water in total. He is concerned that he hasn't consumed the recommended average amount of water intake for the day. He should reach the daily average as long as he
A. drinks another 250mL of water. B. stays out of the sun and doesn't sweat at all. C. eats food containing at least 750mL of water. D. tries not to urinate that day.
During this phase of cell division, the chromatin fibers condense and shorten into chromosomes that are visible under the microscope
a. Prophase b. Prometaphase c. Metaphase d. Anaphase e. Telophase
In the fetus, which blood vessel(s) carries carbon dioxide and metabolic wastes from the fetus to the placenta?
A) ductus arteriosus B) ductus venosus C) umbilical arteries D) umbilical vein
Which germ layer is the thymus derived from?
A. ectoderm B. mesoderm C. endoderm