Plant cells have a ridged cell wall. How do plant cells expand, and how important is cell expansion to plant growth?
What will be an ideal response?
ANSWER: The cellulose meshwork of primary cell wall of a plant must loosen for a plant cell to
expand. Turgor pressure supplies the force for expansion. The loosening of the cell wall is
associated with a drop in pH, but the exact mechanism for loosening is not known. Cell
expansion is very important for plant growth. An individual plant cell can expand to 100
times it embryonic length.
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Which of the following statements about RNA polymerase in bacteria is INCORRECT?
A. It binds the promoter region of a gene. B. It is bound to a sigma factor during initiation of transcription. C. It synthesizes RNA. D. It catalyzes the addition of nucleotides to the 5? end of a growing RNA strand. E. It dissociates from the DNA at the terminator.
Which of the following antibodies is a pentamer?
A. IgA B. IgD C. IgM D. IgE
If you want a plant to grow very large, which hormones might you want to treat it with? Check all that apply.
_____ Abscisic acid. _____ Gibberellins. _____ Brassinosteriods. _____ Cytokinins.
Proteins that are fully translated in the cytosol do not end up in _______
(a) the cytosol. (b) the mitochondria. (c) the interior of the nucleus. (d) transport vesicles.