The frustules in diatoms are composed of ________, which make(s) them difficult to degrade
a. chitin
b. humics
c. silica
d. polysaccharides
Answer: C
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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.
In a polymer of nucleotides, how does one
nucleotide attach to another?
a. the base of one nucleotide is attached to the base of the next b. the base of one nucletide it attached to the sugar of the next c. the sugar of one nucleotide is attached to the sugar of the next d. the phosphate group of one nucleotide is attached to the base of the next e. the phosphate group of one nucleotide is attached to the sugar of the next
Which of the following adds RNA nucleotides,
one at a time, during transcription?
a. RNA polymerase b. DNA polymerase c. RNA nuclease d. transfer RNA e. ribosomal RNA
A learned skill that accompanied early hominin evolution was their ability to _____.
a. develop tools b. grasp objects c. stand upright d. live in caves