The chemical behavior of an atom is determined most directly by the:a
atomic number.
b. atomic weight.
c. number of neutrons.
d. number of energy levels.
e. number of valence electrons
d
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Facilitated diffusion is an important method for cells in obtaining necessary molecules and removing other ones. Requirements for facilitated diffusion include
A. The carrier molecule must be specific to the molecule that is transported. The direction of movement is always with the concentration gradient, never against the gradient. B. The carrier molecule is nonspecific to the molecule that is transported. The direction of movement is always with the concentration gradient, never against the gradient. C. The carrier molecule is nonspecific to the molecule that is transported. The direction of movement is always against the concentration gradient, never with the gradient. D. The carrier molecule must be specific to the molecule that is transported and an ATP molecule must be attached to the specific carrier. The direction of movement is always against the concentration gradient, never with the gradient.
Which of the following is NOT a condition of
genetic equilibrium in a population?
a. no mutations in the population b. the population is small c. the population is isolated d. mating is random e. all of these ARE conditions of genetic equilibrium in a population
Demography is the study of how births and deaths change population sizes over time.
Answer the following statement true (T) or false (F)
Figure 45.6A
?
The image in the above photograph is a prime example of ____.
A. double mutualism B. associative commensalism C. interference competition D. team predation E. parasitism