Describe the benefits of self-incompatibility and self-compatibility
What will be an ideal response?
A benefit of self-incompatibility is that it prevents inbreeding. Inbreeding can result in deleterious
mutations. Self-incompatibility promotes genetic variation by increasing the probability of
outcrossing. Self-compatibility can benefit a plant population by preserving adaptive traits. In addition,
a self-compatible plant does not have to rely on wind or animals for pollination, and therefore can
ensure that seeds can form.
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A pigment absorbs a photon if the energy of the photon is ____
a. exactly enough to boost an electron of the pigment to a higher energy level b. slightly more than the energy of the electron absorbing the photon c. significantly more than the energy of the electron absorbing the photon d. exactly twice the energy of the electron absorbing the photon e. significantly less than the energy of the electron absorbing the photon
During extended periods of dehydration, tardigrades
a. enter suspended animation. b. migrate to the soil subsurface. c. enter small ponds and lakes. d. climb inside a plant leaf and encyst. e. none of these
When environmentalist Rachel Carson warned of a "silent spring," she was referring specifically to:
A) the senseless slaughter of migratory birds by hunters. B) the threat posed to birds by widespread application of pesticides. C) the threat posed to insects by widespread application of pesticides. D) the threat posed to amphibians by newly emerging diseases. E) catastrophic drought caused by global climate change.
Which type of white blood cell is the most common/abundant in normal blood?
a. eosinophil?<2-4% b. monocyte?3-8% c. neutrophil?60-70% d. lymphocyte?20-25%