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9. A gene has the base sequence that starts with CGT ACG GCT AC.

a) What would be the mRNA base sequence formed during transcription, using the DNA sequence shown
above?

What would be first three amino acids in the protein formed from this gene?

9 A gene has the base sequence that starts with CGT ACG GCT AC a What would be the mRNA base sequence formed during transcription using the DNA sequence shown a class=

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Answer:

DNA :      CGT ACG GCT

mRNA:    GCA UGC CGA

A.A:         Ala   Cys   Arg

The mRNA strand is made complementary to the DNA strand. Adenine pairs with uracil in mRNA and thymine in DNA. Guanine pairs with cytosine. The amino acids which will be formed can be depicted in the form of triplets of the bases using a RNA codon table.

Answer:

A) GCA UGC CGA UG  

B) Ala (alanine)

   Cys  (cysteine)

   Arg (arginine)

Explanation:

c) This gene has a mutation and is changed to the sequence below

CCT ACG GCT AC  

What kind of mutation is this?  Point Mutation

d) What is the new mRNA strand formed by this gene?

GGA UGC CGA UG

e) What are the new amino acids formed from this gene?

Gly (glycine)

Cys (cysteine)

Arg (arginine)

f) describe how the mutation has affected the protein coded by this gene.

The mutation changed the amino acid from alanine to glycine. The protein will have one of the wrong amino acids and the protein will not function the way it should.

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