It would be an advantage to have the absence of petals (or reduced petals) in a plant that
distributes pollen via
a. animals.
b. humans.
c. water.
d. wind.
D
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The flexibility of the polypeptide backbone:
A. allows maximum rotation of the unbranched R groups. B. allows resonance between trans and cis configurations. C. is limited by the resonance between the alpha carbon and carboxyl oxygen. D. is limited by resonance between the carboxyl oxygen and amide nitrogen. E. is determined by balance between polar and nonpolar R groups.
Speciation occurs
a. after populations become reproductively isolated and diverge. b. when mutations generate observable differences. c. when transitional forms develop between different populations. d. when natural selection pressures reach their maximum. e. with all of these.
Some friends are trying to make wine in their basement. They've added yeast to a sweet grape juice mixture and have allowed the yeast to grow
After several days, they find that sugar levels in the grape juice have dropped, but there's no alcohol in the mixture. The most likely explanation is that ________. A) the mixture needs more sugar; yeast need a lot of energy before they can begin to produce alcohol B) the mixture needs less oxygen; yeast only produce alcohol in the absence of oxygen C) the mixture needs more oxygen; yeast need oxygen to break down sugar to produce alcohol D) the mixture needs less sugar; high sugar concentrations stimulate cellular respiration, and alcohol is not a by-product of cellular respiration
Oxygen is reduced to
What will be an ideal response?