In colorectal cancer, several genes must be mutated for a cell to develop into a cancer cell. Which of the following kinds of genes would you expect to be mutated?
A) genes coding for enzymes that act in the colon
B) genes involved in control of the cell cycle
C) genes that are especially susceptible to mutation
D) genes of the bacteria, which are abundant in the colon
B
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A group of cells having similar structure and function is called a(n)
A. tissue. B. organ. C. organ system. D. organism. E. population.
A euryhaline species can tolerate:
a. a wide range of temperatures. b. a narrow range of temperatures. c. a wide range of salinities. d. a narrow range of salinities.
The bacterium Rhizobium
A. enters plants through the root hairs. B. All of the answer choices are correct. C. triggers the development of root nodules in legumes. D. breaks the triple covalent bond in N2. E. lives symbiotically within plant cells.
Red tides and extensive fish kills are caused by population blooms of ____
a. Euglena b. specific dinoflagellates c. diatoms d. Plasmodium e. fish