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?
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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If the recombination frequency between gene A and B is 10 out of 100 offspring, gene A and C is 30 out of 100 offspring, and gene B and C is 40 out of 100 offspring, what is the location of these genes in relation to each other on a chromosome?
A. CAB B. BAC C. ABC D. CBA E. either CAB or BAC
How does peer review influence the development of scientific theories?
A. Peer review makes it extremely difficult for work to be published other than earth-shattering scientific theories. B. Careful evaluation of research results by other scientists ensures that only solid and legitimate research results are published, and helps prevent faulty research or false claims from being viewed as scientific fact. C. Peer review increases competition among scientists and thus increases the quality of the published work. D. Peer review allows other scientists to know what is current in their field.
__________ behavior can occur without having been learned by experience.
Fill in the blank(s) with the appropriate word(s).
The use of beta-glucuronidase (GUS) in the generation of Roundup-Ready soybeans is an example of a ________
A) positive marker B) herbicide resistance C) agrobacterium resistance D) negative marker