N-Ras, K-Ras, and H-Ras are best described as
a) Three unrelated oncogenes that each cause sarcomas
b) Three different cancer-causing mutations found in the same ras gene
c) Different activation states of the Ras protein
d) Three closely related genes that likely evolved from a single ras gene
Answer: d) Three closely related genes that likely evolved from a single ras gene
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Lipid vesicles that are used to introduce DNA into a cell for gene therapy are called liposomes
Indicate whether the statement is true or false
The actions of insulin and glucagon could be described as
a. synergistic. b. antagonistic. c. cooperative. d. permissive. e. mutualistic.
The first land plants most likely evolved from
A. Protists B. Green Algae C. Mosses D. Red Algae
The movement of substances from higher to lower concentration across a semipermeable membrane that must have a specific protein carrier but no energy expenditure is called
A. active transport. B. diffusion. C. facilitated diffusion. D. endocytosis. E. osmosis.