Which of the following is true of facilitated transport?
a. Energy must be used.
b. Solutes move through the membrane unassisted.
c. Solutes move up their concentration gradient.
d. No energy is used during facilitated transport .
d. No energy is used during facilitated transport .
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The mutation or deletion of Hox genes in fruit flies causes:
A. embryonic lethality. B. appearance of abnormal body appendages. C. appearance of normal body appendages at inappropriate body positions. D. None of the choices is correct.
How are the five nucleotides similar to each other?
a. All five are composed of a phosphate group, sugar, and a nitrogenous base. b. All five contain the same nitrogenous base. c. All five have the same number of atoms.
Heterospory was an important evolutionary development, as it led to the evolution of:
a. pollen. b. eggs. c. xylem. d. phloem. e. seeds.
The ____________________ covers and protects the outer surfaces of primary plant parts.
Fill in the blank(s) with the appropriate word(s).