The movement of substances from higher to lower concentration across a semipermeable membrane that must have a specific protein carrier but no energy expenditure is called
A. active transport.
B. diffusion.
C. facilitated diffusion.
D. endocytosis.
E. osmosis.
Answer: C
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A fruit fly homozygous for wild-type eyes and straight wings was crossed with a fly homozygous for rosy eyes and wrinkled wings. The progeny all showed wild-type eyes and straight wings
When crossing the F1, the resulting offspring showed 3 wild-type eyes/straight wings : 1 rosy eyes/wrinkled wings. This data suggest: A. rosy eyes is dominant. B. straight wings is recessive. C. these two genes are linked. D. these two genes are sex-linked. E. these two genes are codominant.
Lamarck believed
a. that a substance called fluida moved through the nerves to areas of the body in need of change. b. in the inheritance of acquired characteristics. c. that giraffes' necks elongated in response to stretching. d. that environmental pressures bring about changes in organisms. e. all of these were true
Why are most of the trees in temperate rain forests evergreens?
What will be an ideal response?
Darwin used a tree of life metaphor to:
a. link species in varying degrees of similarity according to their historical pattern of descent. b. describe the branching historical relationships among all living things. c. apply to both the history and pattern of life's diversity. d. All of the above.