Which type of a microscope uses a beam of electrons that moves back and forth across a cell’s surface thereby reflecting the details of the cell to the user?
a. dissecting
b. light
c. scanning electron
d. transmission electron
c. scanning electron
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Declining auxin levels in leaves and fruits trigger these structures to produce ________, which mediates abscission
a. abscisic acid b. gibberellins c. ethylene d. cytokinins
At the end of the mitotic cell cycle, a cell divides into two cells. What must happen before the cell divides?
A. The number of organelles doubles. B. Chromosomes must be copied. C. Four nuclei must be formed. D. The membrane thickens.
When substrate-level phosphorylation occurs, it means that:
A. NAD+ is converted into NADH. B. ADP is converted into ATP by the addition of a phosphate group. C. ATP is converted into ADP plus a phosphate group. D. NADH is converted into NAD+ plus a proton.
Number 2 in the figure is an example of:
a. recapitulation via hypermorphosis. c. paedomorphosis via progenesis. b. recapitulation via acceleration. d. paedomorphosis via neoteny.