Which statement about steroid hormones is true?
A) Steroid hormones cause the production of cAMP.
B) Steroid hormones are polar molecules that cannot pass through the cell membrane.
C) Steroid hormones bind to receptors in the plasma membrane.
D) Steroid hormones bind to specific receptor proteins, and the complex acts as a gene activator.
Answer: D
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Answer the following statement true (T) or false (F)
The cell membranes of wall-less archaeons are strengthened by
A. glycoprotein or protein layers. B. diglycerol ethers. C. pseudomurein. D. diglycerol tetraethers.
Where were the first Ediacaran fossils discovered?
a. Africa b. North America c. Australia d. Asia
All of the offspring of a black hen and a white rooster are gray. The simplest explanation for this pattern of inheritance is:
a) incomplete heterozygosity. b) incomplete dominance. c) multiple alleles. d) codominance. e) sex linkage.