Ectomycorrhizae:a
form arbuscules.
b. are intracellular.
c. coat the plant root.
d. have glomeromycetes as the fungal component.
e. supply plants with organic molecules.
C
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What mechanism is used by a bacterial cell to fit its DNA into the nucleoid region?
A. the formation of loop domains B. supercoiling by topoisomerases C. tight wrapping around histones to form nucleosomes D. the formation of loop domains and supercoiling by topoisomerases E. the formation of loop domains, supercoiling by topoisomerases, and tight wrapping around histones to form nucleosomes
What is the main premise of the blending theory of inheritance that predominated before 1900?
a. We inherit traits from both of our parents. b. Traits are inherited via a mixing of parental blood. c. You're a perfect blend of traits from both of your biological parents. d. It explains the inheritance patterns of traits that skip a generation. e. It explains why children of one tall parent and one short parent generally have an adult height midway between their parents' heights.
Pheromones are used primarily for
a. signaling target cells in the vicinity of the secreting cells. b. stimulating transmitter release at certain synapses. c. integrating social behavior in a population. d. causing a response in a part of the body some distance from the site of secretion. e. all of these, depending on the species.
The (activation /inhibition/saturation) point of an enzyme is reached when all active sites have bound substrate molecules
What will be an ideal response?