Which of the following best describes the composition of the bacterial translation initiation complex?
A. 30S and 50S subunits, mRNA start codon paired with the anticodon of fMet-tRNAfMet, fMet-tRNAfMet bound in the P site, A site is open, GTP is bound by IF-2
B. 30S and 50S subunits, mRNA start codon paired with the anticodon of fMet-tRNAfMet, fMet-tRNAfMet bound in the P site, A site is open
C. 30S and 50S subunits, mRNA start codon paired with the anticodon of fMet-tRNAfMet, fMet-tRNAfMet bound in the A site, P site is open
D. 30S and 50S subunits, mRNA start codon paired with the anticodon of fMet-tRNAfMet, fMet-tRNAfMet bound in the A site, P site is open, GTP is bound by IF-2
B
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When the longitudinal muscles within an earthworm segment contract, what effect does this have on the shape of the segment?
A. The segment will shorten and widen. B. The segment will elongate and widen. C. The segment will shorten and become narrower in diameter. D. The segment will elongate and become narrower in diameter. E. The segment will change length, but not diameter.
Amplification of a signal increases as the ____
a. number of enzyme-catalyzed steps increases b. number of enzyme-catalyzed steps decreases c. volume of the cell increases d. volume of the cell decreases e. rate of reaction of the rate-limiting reaction increases
Which of the following are most closely
related to the choanoflagellates? a. animals b. fungi c. amoebozoans d. algae e. none of these
What characteristic was the key change in the origin of human and human-like species?
a. changes in vision b. changes in teeth and jaws c. bipedalism d. changes in brain size and development e. behavioral changes