In order for protein synthesis to begin, which of the following statements reflects the correct sequence of events?
A. The 3' end of the mRNA binds to the small ribosomal subunit and the AUG anticodon on the tRNA base pairs with the UAC codon on the mRNA, allowing the large ribosomal subunit to attach.
B. The 5' end of the mRNA binds to the small ribosomal subunit, and the large subunit joins, creating the P and A sites where reactions between codons on the mRNA and anticodons on tRNA are stabilized.
C. The AUG codon on mRNA base pairs with the UAC anticodon on tRNA allowing the small and large ribosomal subunits to join the complex.
D. Translation begins when the ribosome translocates from the A site to the P site on the mRNA
Answer: B
You might also like to view...
When Pasteur tested the hypothesis of spontaneous generation, he compared the ability of a sterilized growth medium (meat broth) to produce a population of bacteria in two different types of flasks. One had a simple neck open to the outside, and the
other had a "goose neck" bend that also was open to the environment. Pasteur expected that bacteria would appear in the flask with the standard neck. In this experiment, the standard neck flask served as a/an: A) statistic. B) variable. C) control. D) observation. E) hypothesis.
Mutations are changes to the information in DNA. What would happen to an enzyme's ability to function if a mutation changed the order of some of the amino acids in its polypeptide chain?
What will be an ideal response?
Which of the following is the correct evolutionary sequence?
A. birds ? reptiles ? fish ? amphibians B. fish ? birds ? amphibians ? reptiles C. reptiles ? birds ? fish ? amphibians D. amphibians ? fish ? reptiles ? birds E. fish ? amphibians ? reptiles ? birds
Point mutations in the hemagglutination (HA) or neuraminidase (NA) genes during viral ribonucleoprotein (RNP) replication give rise to new strains. This mechanism is known as the antigenic:
a. drift. b. shift. c. re-assortment. d. modification.