UC BIO SCI 99 – which of the following is not

Question

2. which of the following is not true about eukaryotic translation intiation?

a. hydrolysis of elf2-GTP causes this protein to disassociate from the 40s subunit

b. elF1 binds to the E site on the 40S subunit

c. all of the above are true

d. 43S complex scans along the mRNA to find the start codon

e. an ATPase, elF4G binds directly to the poly(A) tail

3. Which of the following is not a means by which mRNA degredation is affected?

a. binding of proteins to rRNa, which triggers mRNA degredation

b. non-stop decay pathway

c. mRNA can create a hairpin structure preventing degredation

d. mRNA AU-rich elements (AREs) can bind factors that can change the rate at which the mRNA is degraded

e. all of the above are means by which mRNA degradation is affected

4.Which of the following is a way that translational efficiency is controlled in some mRNA?

a. all of the above are ways efficiency is controlled in some mRNA

b. binding of PUF family proteins to certain mRNA

c. two of the above are ways efficiency is controlled in some mRNA

d. the 3’UTR maternal mRNA
e. LTR sequences help the RNA to bind protein factors to allow translation to occur more efficiency

5. which of the following is an inhibitor of protein synthesis?

a. puromycin

b. tetracyclines

c. all of the above are inhibitors of protein synthesis

d. chloramphenicol

e. diptheria toxin

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