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

Biology & Microbiology

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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

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The actions of insulin and glucagon could be described as

a. synergistic. b. antagonistic. c. cooperative. d. permissive. e. mutualistic.

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The first land plants most likely evolved from

A. Protists B. Green Algae C. Mosses D. Red Algae

Biology & Microbiology

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.

Biology & Microbiology