Pili may do all of the following EXCEPT
a. help cells attach to surfaces.
b. function in reproduction.
c. extend from the cell surface.
d. be transferred between cells.
e. function in cell locomotion.
Answer: d
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What structure may have acted as a boundary for a cell-like environment before protocells formed?
a. acidic water from volcanic springs b. chambers in rocks c. metal ions from rocks d. clay e. lipid membrane
When the concentration of glucose in the blood rises following the digestion of a meal, what is the hormonal response?
What will be an ideal response?
The glycolytic pathway will ________ after a large meal and ________ during a long period of exercise.
A) slow down . . . slow down B) slow down . . . speed up C) speed up . . . speed up D) speed up . . . slow down E) not change . . . not change
During the process of diffusion, solutes move ________ their concentration gradient.
a. down b. up c. across d. the solutes do not move during diffusion