1. Which statement best describes translation initiation in Bacteria ? a. it sta

ID: 59770 • Letter: 1

Question

1. Which statement best describes translation initiation in Bacteria?

a. it starts immediately downstream of the promoter

b. the cap structure at the end of the mRNA tells the ribosome where to bind

c. the ribosome binding sites signals the appropriate location for translation initiation

d. the ribosom just uses the first ATG codon in the mRNA as the start codon

e. initiation occurs randomly, and incorrect proteins are just rapidly degraded and recycled

2. Codon bias is best explained by

a. the fact that some amino acids have more codons that specify them than others

b. the occurrence of one start codon but three stop codons

c. the observation that some organisms use different start and stop codons

d. the fact that different organisms use different abundance of tRNA molecules

e. the rule that some cell types will have more codons than some other cell types

3. True or False. During translation, the initiating tRNA contains fMet and binds to the P site in the ribosome.

4. The codon for a given amino acid is located in the ______________ and the anticodon is located in the _________________.

5. The actual molecules that serve the "adaptor" function between nucleic acid sequence and protein sequence in translation are

a. codons and anticodons

b. tRNA and aminoacyl tRNA synthetases

c. mRNA and the ribosome

d. elongation factors and initiation factor

6. In Bacteria and Archaea, transcription and translation are said to be coupled because

a. transcription must finish before translation of the meesage can start

b. transcription and translation must occur at a separate time

c. translation of a message can start before transcription of the message is finished

d. translation of a message must initiate before transcription can terminate

1)d

2)a

3)true

4)mRNA , tRNA

5)b

6)d

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