If all available enzyme molecules are binding substrate and converting it to product as rapidly as possible, the reaction is said to be proceeding at ________ velocity.
A. optimal
B. terminal
C. infinite
D. maximal
Answer: D
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Which of the following statements about blood pressure is false?
a. Systolic pressure occurs when ventricles force blood into arteries b. The greater the blood volume, the higher the blood pressure is. c. The body has blood pressure receptors in the jugular vein and in the superior vena cava. d. Diastolic pressure occurs when ventricles are relaxed.
White blood cells play a particularly important role in ________
A) fighting infections B) supporting the activity of red blood cells C) carrying carbon dioxide D) blood clotting
All of the following are true statements about the lymphatic system EXCEPT that
A) the lymphatic system transports carbohydrates from the small intestine to the blood. B) the lymphatic system returns fluids to the bloodstream. C) lymphatic vessels resemble veins because they have valves. D) the lymphatic system helps defend the body against disease.
Nitrogen fixation consists of the
A) conversion of ammonia to nitrate. B) production of ammonium from decomposing organic matter. C) conversion of N2 to ammonia. D) conversion of N2 to ammonia or nitrate.