1.A base substitution in mRNA replaces cytosine in the codon GUC with adenine. H

Question

1.A base substitution in mRNA replaces cytosine in the codon GUC with adenine. How would this substitution affect the amino acids in the protein?

2.What are the names and abbreviations of the four nucleotides in DNA?

Check all that apply.

3.Identify the nitrogen base and sugar in each of the following nucleosides.

a. deoxythymidine

b.adenosine

c.cytidine

d.deoxyguanosine

4.What is the anticodon on tRNA for each of the following codons in an mRNA?

a. AGC

b.UAU

c. CCA

adenosine-5-monophosphate (AMP) deoxythymidine-5-monophosphate (dTMP) deoxyguanosine-5-monophosphate (dGMP) guanosine-5-monophosphate (GMP) deoxycytidine-5- monophosphate (dCMP) deoxyadenosine-5- monophosphate (dAMP)

Explanation / Answer

1) It is unaffected because nucleotide changes in the third position do not affect the amino acids.

2) Sugar in DNA is deoxyribose, so all the names that have "deoxy-" in it are DNA nucleotides

deoxythymidine-5-monophosphate (dTMP)

deoxyguanosine-5-monophosphate (dGMP)

deoxycytidine-5- monophosphate (dCMP)

deoxyadenosine-5- monophosphate (dAMP)

3) a) Thymine and deoxyribose

b) ribose and adenine

c) ribose and cytosine

d) deoxyribose and guanine

4) A is associated always with U and C with G

a) UCG

b)AUA

c) GGU

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