What is a desirable (and healthy) result of exposure to ultraviolet rays from the sun?
A. A decrease in melanocyte activity
B. Sunburn
C. A deep bronze tan
D. Increased production of vitamin D
E. Increased production of vitamin C
Answer: D
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A deficiency in vitamin _____ may result in night blindness as well as dry, flaky skin
A. A B. B12 C. C D. D E. E
Explain how the ionic compound sodium chloride dissolves in water
A) The positive poles of water molecules are attracted to the negatively charged chloride ions, and the negative poles of water molecules are attracted to the positively charged sodium ions. B) The positive poles of water molecules are attracted to the positively charged chloride ions, and the negative poles of water molecules are attracted to the negatively charged sodium ions. C) The negative poles of water molecules are attracted to the negatively charged chloride ions, and the positive poles of water molecules are attracted to the positively charged sodium ions. D) The negative poles of water molecules are attracted to the positively charged chloride ions, and the positive poles of water molecules are attracted to the negatively charged sodium ions. E) Sodium chloride is hydrophobic so it does not dissolve in water.
Programmed cell death occurs during development, including the removal of webbing between fingers of the fetus. This process is known as
A. mitosis. B. cell differentiation. C. apoptosis. D. cell specialization.
What is the function of the vestibular bulbs in females?
A. To secrete mucus into the uterus B. To constrict the vagina during intercourse C. To lubricate the cervical canal D. To lubricate the vagina E. To neutralize vaginal acidity