Since dominant alleles are always expressed and detected, how can the persistence of autosomal-dominant disorders be explained?
A) many individuals with dominant disorders have overcome the challenges they present and have decided to have children
B) some dominant alleles are not expressed until after the age when most people have reproduced
C) unless the symptoms of the disorder prevent reproduction, the gene may be passed on
D) some conditions are continually reintroduced to a population through spontaneous mutation
E) all of the choices
Ans: E) all of the choices
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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. E) Cells metabolize steroids in different ways, producing by-products that stimulate tRNA production.
The cuticle is
A. the name of the organic molecules that flow through the xylem. B. the tough, complex molecule that forms secondary, rigid cell walls in sclerenchyma cells. C. None of the answer choices is correct. D. the structure that is built up around guard cells, for opening the stomata. E. a waxy layer on the epidermis, for conserving water.
What fraction of your DNA is the same as
every other human being? a. 50% b. 75% c. 90% d. 95% e. 99%
Prepare an argument for why the following statement is incorrect: The formed elements are the only important part of blood, and plasma is just the water they're carried in
What will be an ideal response?