In a phosphate group, a central phosphorus atom binds to which of the following?

a. four oxygen atoms
b. five carbon atoms
c. three oxygen atoms
d. one hydrogen atom


a. four oxygen atoms

Biology & Microbiology

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After working several hours in a flower shop, you do not detect the smell of the roses. Why?

a. Sensory adaptation has occurred. b. Stimulus transduction has increased. c. Sensory perception has been blocked. d. Sensory summation has occurred. e. The nasal epithelium has become blocked.

Biology & Microbiology

Why is it important to regenerate NAD+ during fermentation?

A. To help maintain the reactions of glycolysis B. To transfer an electron to the electron transport chain C. To maintain the levels of pyruvate in a cell D. To produce alcohol or lactic acid for the cell

Biology & Microbiology

In a mammal, blood leaving the lungs goes to the

A) heart. B) limbs. C) liver. D) brain.

Biology & Microbiology

Protozoa are also called prokaryotes

Indicate whether the statement is true or false

Biology & Microbiology