The word evolution, as used in biology, literally means
1.natural selection.
2.genetic drift.
3.divergence.
4.genetic change.
5.mutation.
4
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Which region of a structural gene contains the information that specifies an amino acid sequence?
A. promoter region B. transcribed region C. terminator D. regulatory sequence E. enhancer region
Live-bearing reproduction, or viviparity, has apparently evolved ____
a. just three separate times b. about 200 separate times in vertebrates alone c. only in mammals d. only once, although many groups lost it secondarily e. about 15 separate times
How does habitat fragmentation affect biodiversity?
a. As long as the fragments are of good quality habitat, biodiversity will not be affected. b. Habitat fragmentation increases biodiversity because it reduces entry of exotic species. c. Habitat fragmentation is a threat to biodiversity because small habitat patches sustain only small populations. d. Habitat fragmentation increases biodiversity because adaptation to local conditions stimulates evolution. e. Habitat fragmentation connects terrestrial and aquatic habitats.
The Casparian strip prevents water from diffusing through the ____.
A. epidermis B. vascular tissue C. cortex D. cytoplasm of endodermal cells E. endodermal cell walls