A primary active transport process is one in which __________.
A. the plasma membrane folds inward to form a vesicle containing extracellular material
B. an intracellular vesicle fuses with the plasma membrane and releases its contents to the extracellular fluid
C. molecules pass directly through the phospholipid bilayer of the plasma membrane
D. molecules move through transport proteins that have been activated by ATP
E. molecules move across the plasma membrane without an input of energy
Answer: D. molecules move through transport proteins that have been activated by ATP
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Another name for a chromosome is a ________, because it contains alleles that are often inherited together.
A) linkage group B) crossing over group C) genetic recombinant D) bivalent
In rabbits, coat color is governed by four alleles: C for dark gray, Cch for chinchilla, Ch for himalayan, and c for white
Each individual rabbit inherits a combined total of _____ coat color allele(s) from its parents. a. zero b. one c. two
d. three e. four
Disadvantages of continuous cell cultures include
A. they only grow for a limited number of generations. B. the expense of preparation. C. they may be significantly different genetically from the original source animal. D. viruses do not reliably infect them. E. they are both expensive and have a limited number of divisions.
The __________ are plants that made major contributions to the coal deposits formed hundreds of
millions of years ago. a. hornworts and liverworts b. horsetails and club mosses c. angiosperms d. whisk ferns and true mosses e. lichens and true mosses