Steroid hormones are derived from
a. free fatty acids.
b. cortisol.
c. tyrosine.
d. cholesterol.
e. alanine.
D
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Margarine is made by hydrogenating vegetable oils so that they take on the consistency of butter. Propose a chemical basis for this change from a liquid to a solid
A. Hydrogenation of fats changes them from saturated to unsaturated, which are more solid. B. Trans-fatty acids are changed from unsaturated to saturated, allowing them to solidify. C. Trans fatty acids are changed from saturated to unsaturated, allowing them to solidify. D. Hydrogenation of fats changes them from unsaturated to saturated, which are more solid.
Tropical rain forests typically have a thick layer of litter on the forest floor
Indicate whether the statement is true or false
The clearing made by bacteriophages in a "lawn" of bacteria on an agar plate is called a ________
A) plaque B) phage zone C) lysogenic zone D) host range E) prophage
Choose the letter of the best match from the following:A. birth control pillB. intrauterine deviceC. diaphragmD. foams and jelliesE. vasectomyPrevention of embryo implantation.
Fill in the blank(s) with the appropriate word(s).