Which of the following is not an underlying theme of biology?
A. creation
B. flow of energy
C. cooperation
D. evolution
Answer: A
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Menstrual flow begins in response to:
a. rising levels of FSH and LH b. falling levels of estrogen only c. falling levels of progesterone only d. falling levels of estrogen and progesterone e. rising levels of LH and falling levels of FSH
What happens first following a neuron stimulation?
a. Sodium ions enter the cell. b. Sodium ions leave the cell. c. Potassium ions enter the cell. d. Potassium ions leave the cell. e. Potassium ions are involved in positive feedback.
What do the vitamins biotin and Vitamin K have in common?
A) They are both water-soluble vitamins. B) They are both obtained from meat. C) They are both produced by intestinal bacteria. D) They are both common deficiencies in the human diet.
Which structure is normally on the 5' end of a DNA strand?
A. nitrogenous base B. hydroxyl group C. sulfur group D. phosphate group