What allowed multicellular eukaryotic cells to generate multiple, interacting cell types during development?
A. a dynamic cytoskeleton
B. membrane systems
C. gene regulation
D. the ability to perform photosynthesis
C
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Humans with the condition of familial Down syndrome exhibit which type of chromosomal aberration?
A) chromosome 21 duplication B) chromosome 21 inversion C) chromosome 14/21 Robertsonian translocation D) chromosome 21 deletion E) trisomy of chromosome 21
Referring to Figure 43-4, which of the following would not be involved in producing a receptor
potential?
a. depolarization
b. the opening of a voltage-gated channel
c. the activation of a G protein
d. Na+
e. ADP
Skin color is coded for by several different genes which results in a range of skin colors from very dark to very light. This is an example of
a. polygenic inheritance b. multifactorial trait. c. pleiotropy. d. incomplete dominance
A virgin pine forest covers a valley, and one of the inhabitants is a red squirrel species. A large volcanic eruption occurs and separates the valley with a huge lava flow, thus producing two populations of squirrels. What must occur for the two populations of squirrels to be considered separate species?
A. The two squirrel populations must select mates using different behaviors. B. The two squirrel populations must be reproductively isolated. C. The environment must change so that the populations exist in distinct habitats. D. The two squirrel populations must feed on different species of plants. E. The fur color or other morphological characteristic of the two squirrel populations must become distinct.