Which of the following statements is considered incorrect? select one: a. if all the enzymes that a cell will possibly need are produced all the time, then a cell will waste a lot of energy. b. the transcription of beta-galactosidase is regulated by the presence or absence of lactose in the environment. c. when lactose is present, it binds to the repressor region of the lac operon, thereby causing a conformational change of the repressor and making it fall off from the operator region. d. lactose is the only energy source that bacteria can utilize. e. the enzyme beta-galactosidase catalyzes the hydrolysis of lactose into galactose and glucose.

Two students are working together on an experiment that measures the effect of different liquid fertilizers on the thickness of plants’ stems. which is most likely to result in the greatest amount of error in their scientific experiment? a.one student measures the plant stem widths by using calipers. the other student measures the widths of the same plant stems again by using a different pair of calipers. b.one student measures the plant stem widths by using calipers. the other student types the measurements as they are taken into a computer spreadsheet. c.one student weighs liquids for the experiment by using a calibrated scale. the other student weighs liquids for the experiment by using a different calibrated scale.

What was darwins theory of common decent

Which of the following was not a major animal on land during the carboniferous period? amphibians insects both a and b none of the above