How did the eukaryotic nucleus arise?
a. through the uptake of the cell's genome by a membrane organelle already present in the cell
b. through cytoplasmic diffusion
c. through an endosymbiotic relationship with a bacteria
d. through infoldings of the cell's plasma membrane
e. through formation of a new internal membrane by the eurkaryotic cell
d
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You are conducting a genetic screen using Caenorhabditis elegans embryos to isolate mutations affecting anaphase (A). Therefore, you need to look for embryos in which
A. the centromeres do not move toward the poles. B. the poles do not move apart. C. the spindle apparatus does not disassemble. D. sister chromatids are mismatched and therefore fail to separate.
Which component in the cell membrane restricts the passage of water-soluble substances?
a. sterols b. phospholipid c. protein d. glycolipids
_____ is the stimulus for phototropism
a. Red light c. Green light b. Far-red light d. Blue light
Endocrine products are a class of molecules called ________.
Fill in the blank(s) with the appropriate word(s).