Which hormone promotes cell division and delays senescence in plants?
a. abscisic acid
b. auxin
c. cytokinin
d. ethylene
e. gibberellin
c
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Some people are resistant to HIV because______
A. They carry the mutant CCR5 allele B. They have excess white blood cells C. Of previous exposure to the virus D. No one is resistant to HIV
Which of the following statements describe meiosis I in humans?
What will be an ideal response?
"Immediate early genes" such as myc can best be thought of as genes that
a) Are only expressed in the absence of growth factor (GF) stimulation b) Become permanently switched off during tumorigenesis c) Code for GF receptors such as RTKs d) Represent the first wave of expression following GF stimulation
Individuals in the population grouped according to levels of maturity define the population's ____.
A. carrying capacity B. age structure C. density D. size E. birth rate