Sulfur has an atomic number of 16. How many covalent bonds can sulfur form?
A) 1
B) 2
C) 4
D) 0
Answer: B) 2
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Which of the following are muscle cells that are active in vasoconstriction and vasodilation of blood vessels?
A. Skeletal muscle cells B. Cardiac muscle cells C. Endocardium D. Smooth muscle
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Lipid-soluble hormones
A. do not require a second messenger. B. have a slower release time than water-soluble hormones. C. pass through cell membranes. D. alter gene expression. E. All of the answer choices are correct.
Visual pigments are molecules made of
a. protein only. b. carbohydrate only. c. vitamin derivative only. d. steroid only. e. protein and a vitamin derivative