Use the genetic code for the following questions: https://en.wikipedia.org/wiki/
ID: 197940 • Letter: U
Question
Use the genetic code for the following questions: https://en.wikipedia.org/wiki/Genetic_code
A segment of an mRNA transcript is as follows: …UUCCCGUGUGAUAAU… (ellipses indicate more bases in the transcript).
If the resulting polypeptide chain is …Ser-Arg-Val-Ile…, what must be the reading frame?
a. …UUC-CCG-UGU-GAU-AAU…
b. …U-UCC-CGU-GUG-AUA-AU…
c. …UU-CCC-GUG-UGA-UAA-U…
Suppose the reading frame is …UU-CCC-GUG-UGA-UAA-U…; what is the resulting polypeptide chain?
a. …Phe-Pro-Cys-Asp-Asn…
b. …Ser-Arg-Val-Ile…
c. …Pro-Val-Tyr-Tyr…
d. …Pro-Val
A ribosome is comprised of which macromolecule(s)? Select ALL that apply:
a. protein
b. RNA
c. DNA
How many tRNA binding sites do ribosomes have?
a. one
b. two
c. three
d. it depends on the size of the protein being made
Explanation / Answer
If the resulting polypeptide chain is …Ser-Arg-Val-Ile…, what must be the reading frame?
Answer=
b. …U-UCC-CGU-GUG-AUA-AU…
- Ser - Arg - Val - Ile
because UCC codes for Ser ,CGU codes for Arg,GUG codes for Val and AUA codes for isoleucine.
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Suppose the reading frame is …UU-CCC-GUG-UGA-UAA-U…; what is the resulting polypeptide chain?
Answer=
d. …Pro-Val
explaination= CCC codes for proline ,GUG codes for Valine then UGA does not code for any amino acid since it is stop codon.therefore translation stops here.
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A ribosome is comprised of macromolecule(s)
a. protein
b. RNA
explaination=Ribosomes are minute particles comprising of RNA and associated proteins.
ribosomal RNA are present.
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How many tRNA binding sites do ribosomes have?
c. three
explaination=ribosomes are composed of two subunits ,one small and one large.four binding sites are located on the ribosome,one for mRNA and three for tRNA .
three tRNA sites are labelled as
P site- peptidyl site
A site-aminoacyl tRNA site
E site- Exit site
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