Which of the following statements concerning the properties of ligands for intracellular receptor systems is correct?
A) Steroids are produced from cholesterol.
B) Changes in the composition of your diet can affect the concentration of some of these ligands in your body.
C) Some ligands are bound to specific proteins when carried in the blood.
D) both choices A and C
E) choices A, B, and C
E) choices A, B, and C
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Who discovered that DNA was the genetic material or transforming factor that could convert nonvirulent R-type Streptococcus pneumoniae bacterium to the virulent S-type?
A. Weismann and Nageli. B. Griffith. C. Avery, MacLeod, and McCarty. D. Hershey and Chase. E. Watson, Crick, Wilkins, and Franklin.
When a species dies, the species is said to be:
a. extinct. b. extant. c. endangered. d. threatened. e. endemic
ATP is composed of a nitrogenous base, a sugar, and
A.) one phosphate group. B.) two phosphate groups. C.) three phosphate groups. D.) four phosphate groups.
A complete virus particle is called a ________.
A. nucleocapsid B. virion C. cell D. capsid