Design an experiment to test whether molecular weight does indeed influence the rate of diffusion. Be sure to list all controlled variables.
What will be an ideal response?
Answers will vary. Controlled variables may include temperature, pH, composition and volume of solvent or medium, amount of solute added. Solutes could be soluble dyes of different molecular weight, and rate of diffusion could be estimated by observing the extent of coloration around a dye crystal at specified intervals.
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The best term for referring to the rear or tail end is
A. lateral. B. caudal. C. cephalic. D. inferior. E. superior.
Which of the following would disqualify a chemical messenger from being considered a paracrine signal?
a. It is an organic molecule. b. It is not transported in the blood. c. It affects the cell that released it. d. Once released, it is distributed to its target(s) by simple diffusion. e. It is released as a specific response to a signal.
There are ____________________ pairs of spinal nerves and ____________________ pairs of cranial nerves.?
Fill in the blank(s) with correct word
During cleavage divisions, there is an increase in both the number and size of the cells.
Answer the following statement true (T) or false (F)