Using the car analogy for regulation of gene expression in which negative control is exerted by setting the parking brake and positive control occurs by stepping on the gas pedal, which answer best defines a component of lac operon control?
a. inducer (lactose) = acts by stepping on the gas pedal
b. cap binding site = part of gas pedal
c. repressor = releases the parking brake
d. operator = part of the gas pedal

Why did rutherford say that bombarding atoms with particles was like "playing with marbles" what

Which of the following observation darwin shape his concept of descent with modification? a) species diversity declines farther from the equator. b) fewer species live on islands than on the nearest continents. c) birds live on islands located farther from the mainland than the bird's maximum nonstop flight distance. d) south american temperate plants are more similar to the tropical plants of south america than to the temperate plants of europe. e) earthquakes reshape life by causing mass extinctions.

Which describes a grizzly bear’s habitat?