The element found in most abundance in living organisms is

A. calcium.
B. iron.
C. iodine.
D. hydrogen.
E. sodium.


D. hydrogen.

Biology & Microbiology

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In most cases, the first product of a particular biosynthetic pathway represses the enzymes of the pathway

Indicate whether the statement is true or false.

Biology & Microbiology

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.

Biology & Microbiology

Plasma in a blood vessel is separated from cells by interstitial fluid

Indicate whether the statement is true or false.

Biology & Microbiology

The end product of glycolysis is

a. acetyl-CoA. b. oxaloacetate. c. pyruvate. d. citrate. e. acetyl-CoA and oxaloacetate.

Biology & Microbiology