Steroid hormones travel through the body and can enter all cells. Why do only selected cells respond to a particular steroid hormone?
What will be an ideal response?
Steroid hormones enter all cells, but they can only affect those cells that have a receptor in place. Thus a cell is primed to respond because it has a receptor for the hormone.
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After the guanine, what is the next nucleotide that will be added to this growing strand of RNA?
1.adenine
2.cytosine
3.guanine
4.uracil
Plants became erect, taller, and branched as a result
of their ability to produce a. cutin. b. lignin. c. cellulose. d. complex carbohydrates. e. suberin.
The DNA double helix is held together by (covalent/ionic/hydrogen) bonds
What will be an ideal response?
A number of mechanisms operate to maintain genetic diversity in a population. Why is such diversity favored?
A) Genetic diversity may better adapt a population to inevitable changes in the environment. B) Genetic diversity helps populations avoid diploidy. C) Homozygosity is an evolutionary advantage. D) Diversity leads to inbreeding advantages. E) Greater genetic diversity increases the chances of haploidy.