The likely number of and locations of transmembrane segments of integral membrane proteins is inferred by
A) X-ray crystallography.
B) SDS-PAGE.
C) western blot.
D) hydropathic analysis.
E) affinity labeling.
D) hydropathic analysis.
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Use the following diagram of five islands formed at around the same time near a particular mainland, as well as MacArthur and Wilson's island biogeography principles, to answer the question(s) below
Which island would likely have the greatest species diversity? A) A B) B C) C D) D E) E
Pollen tubes
A. transport pollen to the stigma. B. facilitate the growth of pollen. C. package sperm into pollen granules. D. allow sperm to fertilize the egg. E. are present during spermatogenesis.
Oils are
a. liquid at room temperatures. b. unsaturated fats. c. found only in animals. d. complex carbohydrates. e. both liquid at room temperature and unsaturated fats.
The first plants to produce seeds evolved during which time period?
a. Mesozoic era b. Cenozoic era c. Jurassic period d. Devonian period e. Cretaceous period