Which of the following events could cause a plant that normally grows in a sunny habitat to dramatically elongate its stem?
a) The plant was watered.
b) The plant was exposed to a high level of far-red light.
c) The plant was exposed to blue light.
d) The plant was not exposed to far-red light.
Answer: b) The plant was exposed to a high level of far-red light.
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A key difference between transforming plant cells and human cells is
A. genes to be expressed in human cells require a eukaryotic promoter, and genes to be expressed in plants don't. B. DNA cannot be introduced into human cells. C. Agrobacterium is commonly used as a tool to directly transform plant cells but not human cells. D. a vector is needed to introduce DNA into human cells and not plant cells.
If 14C-labeled uracil is added to the growth medium of cells, what macromolecules will be labeled?
A) DNA B) RNA C) both DNA and RNA D) proteins
RNAi methodology uses double-stranded pieces of RNA to trigger breakdown of a specific mRNA or inhibit its translation. For which of the following might this technique be useful?
A) to decrease the production from a harmful mutated gene B) to destroy an unwanted allele in a homozygous individual C) to form a knockout organism that will not pass the deleted sequence to its progeny D) to raise the concentration of a desired protein
Recognition proteins are most important for
A) distinguishing foreign cells from "self" cells. B) active transport of molecules. C) maintaining membrane fluidity. D) maintaining membrane integrity. E) facilitated diffusion of molecules.