Which of the following represents the genotype of a male who is color-blind?
A. XbXb
B. XBY
C. XbY
D. XBXB
E. XBXb
Answer: C
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The route followed by a sperm from production to fertilization in a flowering plant is:
A. A sperm cell, enclosed in a pollen grain with another sperm, is produced in the pistil that explosively ejects it into the air where it is transported to a stigma from which it passes through a pollen tube that grows down the style to the ovary, enters the ovule and joins with the egg cell. B. A sperm cell, enclosed in a pollen grain with another sperm, is produced in the anther, transported to a stigma where it passes through a pollen tube that grows down the style to the ovary, enters the ovule and joins with the egg cell. C. A sperm cell, enclosed in a pollen grain with another sperm, is produced in the filament, transported to a stigma where it passes through a pollen tube that grows down the style to the ovary, enters the ovule and joins with the egg cell. D. A sperm cell, enclosed in a pollen grain with another sperm, is produced in the anther, transported to the peduncle where it passes through a pollen tube that grows down the style to the ovary, enters the ovule and joins with the egg cell. E. A sperm cell is produced in the anther, transported to a stigma where it becomes enclosed, along with another sperm cell into a pollen grain that grows down the style to the ovary, enters the ovule and joins with the egg cell.
One effect of auxin, which triggers the elongation of cells, is to affect cell walls by increasing their
A. permeability. B. plasticity. C. stiffness. D. thickness. E. water solubility.
The numerous, different species of Hawaiian honeycreepers that can be identified are a classic example of what concept?
a. adaptive radiation b. convergent evolution c. reticulate evolution d. homology e. punctuated equilibrium
Consider the following case. At a ranch, a horse is infected with Eastern equine encephalitis virus. A mosquito bit the animal, was contaminated with the virus, and proceeded to bite and infect a ranch hand. The horse is slaughtered and its meat is consumed by the ranch hands at a cookout. Which was the vector?
A. Mosquito B. Ranch hands at the cookout C. Bitten ranch hand D. Virus E. Horse