DNA has a double helix structure. Refer to the figure below. What two components make the outside rails (called the backbone) of the double helix?





a. nitrogenous bases and carbon

b. hydrogen and ribose

c. sugar and phosphate

d. enzymes and sugar


c. sugar and phosphate

Biology & Microbiology

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The magnitude of the action potential is correlated with the strength of the stimulating input

A. true B. false

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What is the most common cause of pulmonary edema?

A) collapsed lung B) blood clot C) kidney failure D) right heart failure E) left heart failure

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A healthy male will release ____ sperms during one ejaculation. 

A. 300 B. 3,000 C. 30,000 D. 300,000,000  

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During the follicular phase of the female menstrual cycle, estrogen is produced by the

A. follicle cells. B. anterior pituitary. C. developing zygote. D. uterus.

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