Which events below are thought to allow p53 to direct a cell into apoptosis?
a) binding of p53 to proteins that directly trigger mitochondrial membrane permeabilization and release of apoptotic factors
b) activation of the expression of the BAX gene
c) all of the choices are correct
d) binding of p53 to several members of the Bcl-2 family proteins
Ans: c) all of the choices are correct
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The effect of beneficial microbes of normal biota against invading microbes is called ________.
A. axenic B. microbial antagonism C. infectious disease D. endogenous infection E. gnotobiotism
When two true-breeding parental genotypes are crossed, the offspring are referred to as the
A. F1 generation. B. true recessives. C. F2 generation. D. test cross.
There are no trees in the tundra because:a
of the short growing season. b. of the limited supply of nutrients in the soil. c. permafrost limits the depth to which roots penetrate. d. of limited precipitation. e. of low temperatures.
Why do most of the flowers in a temperate deciduous forest bloom in the spring?
A) The leaves of deciduous trees do not block the light in the spring; therefore, sunlight reaches the forest floor. B) The largest number of insect pollinators is available in the spring. C) In the spring, the trees do not block the wind and thus do not prevent wind pollination. D) The spring is the dry season; most of the rain falls during the cool, wet winters. E) Nutrients are most available in the spring.