At puberty, an adolescent female body changes in both structure and function of several organ systems, primarily under the influence of changing concentrations of estrogens and other steroid hormones
How can one hormone, such as estrogen, mediate so many effects? A) Estrogen is produced in very large concentration by nearly every tissue of the body.
B) Each cell responds in the same way when steroids bind to the cell surface.
C) Estrogen is kept away from the surface of any cells not able to bind it at the surface.
D) Estrogen binds to specific receptors inside many kinds of cells, each with different responses.
D
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In mammals, males are ________ and females are ____________.
A. heterozygous, homozygous B. hemizygous, homozygous C. homozygous, heterozygous D. hemizygous, heterozygous E. heterozygous, hemizygous
Which amino acid would Nirenberg and Leder have found when they used the triplet UAG?
A. Isoleucine B. Proline C. Lysine D. Threonine E. None of these
Explain how an oligotrophic lake can become eutrophic
What will be an ideal response?
The famous pink-colored sand of Bermuda's beaches is due to crushed shells of ________, marine organisms with tests (porous shells) made of organic material hardened by calcium carbonate
A) radiolarians B) green algae C) foraminifera D) lobsters