Light reflected by chlorophyll a has a wavelength of approximately _____
1.475 nm
2.500 nm
3.575 nm
4.650 nm
3
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One reason we see relatively little genetic variation among human regional populations is that:
A. extensive migration among human populations has homogenized gene pools. B. extensive convergent evolution has homogenized gene pools. C. genetic drift has reduced variation in most regional populations over time. D. humans migrated out of Africa so recently that we haven't had enough time for regional variation to accumulate. E. None of the answer options are correct.
Which element is least useful for dating fossils greater than 10 million years old?
a. Carbon-14 b. Uranium-238 c. Uranium-235 d. Thorium-232 e. Rubidium-87
Which statement does NOT correctly describe hormones that can directly enter a cell?
A. Steroid hormones can enter directly into cells because of their hydrophobic makeup. B. Water-soluble hormones can enter directly into cells because of their nonpolar makeup. C. Steroid hormones dissolve poorly in the plasma and are transported to target cells via special protein carriers. D. Once these hormones enter a cell, they bind to a cytoplasmic receptor and travel as a complex to the nucleus, or they may bind to the receptor after entering the nucleus.
Which connective tissue lacks fibroblasts, or a true matrix, and contains few fibers?
a. muscle b. blood c. adipose d. bone