10 Jun BIOCHEM 1 – it is possible to convert the Cys
Question
it is possible to convert the Cys that is a part of Cys-tRNACys to Ala by a catalytic reduction. If the resulting Ala-tRNACys were added to a mixture of (1) ribosomes, (2) all the other tRNAs and amino acids, (3) all of the cofactors and enzymes needed to make protein in vitro, and (4) mRNA for hemoglobin, where in the newly synthesized hemoglobin would the Ala from Ala-tRNACys be incorporated?
Wherever Ala normally occurs.
Wherever Cys normally occurs.
Wherever either Ala or Cys normally occurs.
Wherever the dipeptide Ala-Cys normally occurs.
In a normal, non-plasmid containing, E. coli cell the binding of the lac repressor protein to the lac operator causes
an increase in the synthesis of DNA that encodes the lac operon.
a decrease in the synthesis rRNA used to produce ?-galactosidase.
an increase in the synthesis of the mRNA that encodes ?-galactosidase.
a decrease in the synthesis of the mRNA that encodes the ?-galactosidase.
Which of the following reagents would not be found in the DNA sequencing method of Sanger?
Primer
rNTPs
ddNTP
DNA polymerase
Peptide bond formation on the ribosome requires direct coupling to ATP hydrolysis:
true or false ?
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