Which statement about autotrophs is true?
a. Photoautotrophs are the most common ecosystem energy source.
b. Chemoautotrophs depend on sunlight to generate energy.
c. Photoautotrophs consist primarily of bacteria and archaea.
d. Chemoautotrophs are typically found in grazing food webs.
a. Photoautotrophs are the most common ecosystem energy source.
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The length of the lag phase of growth can vary depending on
A. the nature of the growth medium. B. the temperature. C. the condition of the microorganisms. D. All of the choices are correct.
What type of protein is being activated by the G1/S cyclin-CDK complex to promote the expression of histone proteins?
A. a synthase B. a polymerase C. a helicase D. a transcription factor
Gehring tested the hypothesis that the Pax6 gene acts as a master regulator of eye development by engineering Drosophila Pax6 genes to be expressed in Drosophila antennae. What happened, and did it support or refute his hypothesis?
A. A compound eye developed on the antenna; this supports the hypothesis. B. A compound eye developed on the head; this supports the hypothesis. C. The antenna developed normally; this falsified the hypothesis. D. The antenna developed where the eye normally would be; this supports the hypothesis. E. The antenna developed where the eye would normally be; this falsified the hypothesis.
Which of the following is the smallest or least inclusive group?
A) Genus B) Class C) Family D) Kingdom E) Domain