When a root is placed on its side, what happens to the amyloplasts in the root cap cells?
a. They move away from the direction of gravity.
b. They settle in the direction of gravity
c. They are digested by amylase.
d. They move into the root apical meristem.
e. They move into a root hair.
b
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Two fundamental concepts about the ion channels of a "resting" neuron are that the channels _____
A) are always open, but the concentration gradients of ions frequently change B) are always closed, but ions move closer to the channels during excitation C) open and close depending on stimuli, and are specific as to which ion can traverse them D) open in response to stimuli, and then close simultaneously, in unison
Carrier protein in the plasma membrane that moves sodium ions out of and potassium ions into cells; important in the function of nerve and muscle cells in animals.
What will be an ideal response?
What are the components of a population pyramid?
a. Gender b. Population c. Age d. Weight
Fitness is a measure of reproductive success. If an individual with genotype BB produces 6 offspring, and a heterozygous individual (Bb) produces 10 offspring, and a third individual with genotype bb produces 5 offspring, what is the fitness value for the individual with BB genotype?
A. 0.6. B. 1.0. C. 0.4. D. 0.5. E. 1.1