Environment
What will be an ideal response?
The external physical (abiotic) and biological (biotic) factors which influence growth, survival, development, and reproduction of organisms; an organisms surroundings
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Human males and females are roughly equivalent in terms of gene expression from the X chromosome because
A) one of a female's two X chromosomes is inactivated. B) males only have one X chromosome. C) one X chromosome is inactive in male cells. D) males are hemizygous.
In 1975, scientists convened in Asilomar, California and
A) determined that restriction enzymes could cut DNA. B) created the first transgenic animals. C) reviewed the use of drugs produced by recombinant DNA technology. D) drew up guidelines to regulate recombinant DNA technology.
Which of the following is the correct sequence of PCR?
A) Heat to 90°C (to separate DNA), then cool to 50°C (to bind primers and enzymes), and then reheat to 70°C (to synthesize DNA). B) Heat to 90°C (to bind primers and enzymes), then cool to 50°C (to separate DNA), and then reheat to 70°C (to synthesize DNA). C) Heat to 70°C (to bind primers and enzymes), then cool to 50°C (to synthesize DNA), and then reheat to 90°C (to separate DNA). D) Heat to 70°C (to separate DNA), then cool to 50°C (to bind primers and enzymes), and then reheat to 90°C (to synthesize DNA).
The mechanism for excreting nitrogenous waste in aquatic animals was ineffective on land because
A) land animals concurrently developed a more efficient reproduction system. B) land animals found better food sources. C) land animals had a more difficult time with water balance than aquatic species. D) aquatic animals did not have as much protein in their diets as did land animals.