Why do women experience the symptoms of osteoporosis more acutely than men?
A) Men take in more calcium in their diet, so they can't get osteoporosis.
B) Women have less bone mass and produce less estrogen later in life; these factors accelerate calcium loss.
C) Women have less muscle mass and don't exercise as much.
D) Men don't produce estrogen, so they don't rely on it as much as women do.
Answer: B
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Scientists at the Natural History Museum in London estimate that more than ____ percent of living species have not
yet been discovered.
a. 11 b. 27 c. 32 d. 56 e. 98
How does phosphorus enter the biological portion of the cycle?
a. Land plants take up dissolved phosphate from the soil water. b. Bacteria fix phosphate from the atmosphere. c. Consumers eat phosphate containing soil. d. Bacteria fix phosphate from water. e. Erosion of rocks moves phosphate into water, which consumers drink.
Many species are held below the environmental carrying capacity by predation.
Answer the following statement true (T) or false (F)
Once it is inside a human cell, the HIV enzyme, ________, manufactures a DNA copy from the viral RNA.
A. reverse transcriptase B. DNA polymerase C. forward transcriptase D. helicase