Sieve tubes are part of _____
a. cortex c. phloem
b. mesophyll d. xylem
C
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Examination of the rhodopsin gene family provides evidence for gene evolution by
A) duplication and divergence. B) accumulation of random mutations. C) convergent evolution. D) spontaneous generation.
When the O2 in the muscles of an individual who has exercised for a long period of time is used up, this condition is known as ________
Fill in the blank(s) with correct word
The p53 gene is a tumor-suppressing gene that prevents damaged cells from undergoing cell division. If this gene ceases to function due to a mutation, what will happen to the cell?
A) Tumors will be suppressed. B) The cell will be prevented from undergoing division. C) The cell will die. D) Uncontrolled cell division will occur.
The homeless in the United States are at increased risk of undernutrition. Which of the following is true about the homeless?
Select one: a. Most of them are alcoholics. b. Most of them are lazy. c. Many are members of families with children. d. All are poorly educated.