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

Football players often sustain lateral blows to the extended knee. which of the ligaments is (are) damaged as a result? a. suprapatellar b. oblique popliteal and extracapsular ligament c. medial collateral, medial meniscus, and anterior cruciate d. arcuate popliteal and the posterior cruciate

The image shows the evolution of a species of fish. a few fish from a population developed different social behaviors and evolved into different species. two fish according to the image, the fish underwent . the new species of fish had mating seasons that were different from that of the original fish. because of the differences in mating seasons, the fish underwent reproductive isolation. this mode of isolation would be .

Which of the following organisms are capable of self-fertilization? a. plants b. tigers c. humans