What are organized clusters of membrane proteins that selectively allow substances to cross into and out of the nucleus?
a. nuclear pore
b. passive transport protein
c. receptor
d. nuclear envelope
e. ribosome
a
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________ is a beneficial relationship similar to mutualism, in which the relationship is not obligatory.
Fill in the blank(s) with the appropriate word(s).
Which statement best describes the relationship between an enzyme and a reactant?
A) The relationship is temporary. B) The enzyme and the reactant molecule are both permanently changed. C) The resultant product and the enzyme are permanently bonded together. D) Covalent chemical bonds stabilize the relationship. E) One enzyme typically has many reactants with which it will associate.
Figure 30.11
The plant movement in the accompanying figure is caused by ____.
A. auxin differences in two sides of the stems B. gibberellin released in one side of the leaf C. abscisic acid in two sides of the stems D. salicylic acid in two sides of the roots E. cytokinin differences in two sides of the stem
Looking at the figure above, which of the following trees are equivalent?
a. The most recent common ancestor, species 2, is more closely related to species 1 than to species 3. b. The most recent common ancestor, species 2, is more closely related to species 3 than to species 1. c. The most recent common ancestor, species 1, is more closely related to species 3 than to species 2. d. The most recent common ancestor, species 1, is more closely related to species 2 than to species 3.