Proto-oncogenes are genes that promote the development of tumors
Indicate whether the statement is true or false
FALSE
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When mangroves and seagrasses are reduced or damaged all occur except:
a. coastal erosion. b. reduction of productivity. c. reduced nursery grounds. d. increased primary production. e. increased sedimentation from land sources transported onto offshore coral reefs.
The average weather condition an area receives over a long period of time is called the
a. forecast b. climate c. weather range d. precipitation range e. humidity range
Gatekeeper genes and caretaker genes are both involved in cancer, but gatekeeper genes can be distinguished from caretaker genes because gatekeeper genes _____ while caretaker genes _____
1.affect the mutation rate of all genes / normally prevent chromosomal instability and aneuploidy 2.mutate to stimulate uncontrolled cell division / encode proteins that limit the rate of cell division 3.control the cell cycle / encode proteins involved in DNA repair 4.all of the choices
Which sequence of events describes natural selection?
A) A population of a mammal species varies in the length of their legs; water levels rise and the habitat becomes swampy; the individuals with shorter legs are better able to swim to food; the population evolves to become shorter-legged. B) A population of a mammal species lives near the water; water levels rise and the habitat becomes swampy; the animals have trouble moving in the water; the population changes to a shorter-legged type so they can move more easily in the water. C) Water levels rise, and a habitat becomes swampy; a population of a mammal species on high ground observes the change; individuals with shorter legs migrate to the area. D) A population of a mammal species lives near the water; water levels rise and the habitat becomes swampy; the act of swimming shortens the legs of the mammals; the offspring of the mammal species have shorter legs.