Question

True or false: translation always begins at the first nucleotide of the mRNA transcript.

a. true

b. false

True or false: in bacteria, multiple proteins can be made from one mRNA transcript.

a. true

b. false

What is the Shine-Dalgarno sequence?

a. A purine-rich sequence that comes before the start codon in bacterial cells and also indicates where translation should begin

b. The point in the mRNA at which the identity of the protein is determined

c. A purine-rich sequence that comes right before the stop codon, signaling the cell to get ready to process the newly synthesized amino-acid string

d. A sequence that follows the stop codon that attracts the appropriate post-translational enzymes

Answer 1

Translation always begins at the first nucleotide of the mRNA transcript - FALSE

Translation begins at the UAC nucleotides whose anticodon are AUG which codes for methionine. Methionine is start codon. UAC nucleotides need not necessary to present at the starting of mRNA transcript rather this sequence can present anywhere in mRNA.

In bacteria, multiple protein can be made from one mRNA transcript - FALSE

Alternative splicing make different proteins from single mRNA, but alternate splicing is not observed in bacteria.

Shine-Dalgarno sequence - A purine rich sequence that comes before the start codon in bacterial cell and also indicates where translation should begin.