An evil genius wants to stop all vascular plants from photosynthesizing. He decides to send his minions out to cut off the structures in plants where most photosynthesis takes place. Which structures should his minions remove?
A. roots
B. flowers
C. leaves
D. stems
C
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In the context of cell communication, to what does the term ligand refer?
A. a signaling molecule B. the extracellular domain of a receptor protein C. the proteins activated as part of a signal transduction pathway D. a type of gated channel
The sodium-potassium pump of neurons pumps
A. Na+ and K+into the cell. B. Na+ and K+ out of the cell. C. Na+ into the cell and K+ out of the cell. D. Na+ out of the cell and K+into the cell. E. Na+ and K+into the cell and H+ out of the cell through an antiport mechanism.
Which parts on the phylogenetic tree represent points in evolution where researchers believe ancestors diverged?
a. leaves b. nodes c. branches d. stems
Which of the following enzymes digests fats?
a. aminopeptidase b. disaccharidases c. amylase d. lipase e. trypsin