The direction of water movement across a cell membrane is determined in part by:

A. the presence of transporter molecules.
B. the levels of ATP in the cell.
C. the concentration of solutes inside and outside the cell.
D. the pressure gradient existing between the inside and the outside the cell
E. the concentration of solutes and the pressure gradient existing between the inside and the outside the cell.


E. the concentration of solutes and the pressure gradient existing between the inside and the outside the cell.

Biology & Microbiology

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Neurons that carry messages within the CNS are

a. sensory. b. motor. c. interneurons. d. autonomic.

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During labor, what type of feedback mechanism involves the release of oxytocin, which stimulates the uterus to contract, and these contractions stimulate the release of more oxytocin resulting in ever stronger contractions?

What will be an ideal response?

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The pH scale is a mathematical indicator of the

a. ability to dissolve in water. b. total amount of all ions in a solution. c. concentration of OH present in a solution. d. ability of a solution to buffer. e. concentration of H present in a solution.

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Which of the following is not involved in the "taste" of food? 

A. temperature B. texture C. color D. chemical composition

Biology & Microbiology