Question

Write the mRNA that would form for the following section of DNA. For each codon in the mRNA, write the amino acid that would be placed in the protein by a tRNA.

3.1. DNA strand: 3’—CCC—TCA—GGG—CGC—5’

mRNA: —______—______—______—______—

amino acid order _______—_______—_______—_______

3.2. DNA: 3’—ATA—GCC—TTT—GGC—AAC—5’

mRNA: —______—______—______—______—______—

amino acid order —_______—_______—_______—_______—_______

• If a base substitution in DNA ( G replaces C in DNA ) ,changes the second codon in mRNA, how is the amino acid sequence affected in the resulting protein?
DNA: —ATA—GCG—TTT—GGC—AAC—

mRNA: —______—______—______—______—______—

amino acid order —_______—_______—_______—_______—_______

Fill in the blanks with a word or phrase that answers each of the following questions:

1) Where in the cell does transcription take place? __________________

2) How many strands of the DNA molecules are
involved? __________________

3) The abbreviations for the four nucleotides in mRNA are: __________________

4) Write the corresponding section of a mRNA produced from each of the following
DNA chains:

a. 3’—C—A—T—T—C—G—G—T—A-5’

b. 3’—G—T—A—C—C—T—A—A—C—G—T—C—C—G—5’

 
3. Write the mRNA that would form for the following section of DNA. For each codon in the mRNA, write the amino acid that would be placed in the protein by a tRNA.

3.1. DNA strand: 3’—CCC—TCA—GGG—CGC—5’

mRNA: —______—______—______—______—

amino acid order _______—_______—_______—_______

3.2. DNA: 3’—ATA—GCC—TTT—GGC—AAC—5’

mRNA: —______—______—______—______—______—

amino acid order —_______—_______—_______—_______—_______

• If a base substitution in DNA ( G replaces C in DNA ) ,changes the second codon in mRNA, how is the amino acid sequence affected in the resulting protein?
                          DNA: —ATA—GCG—TTT—GGC—AAC—

mRNA: —______—______—______—______—______—

amino acid order —_______—_______—_______—_______—_______

Answer 1

If the DNA sequence is 3'CCCTCAGGGCGC5' then the mRNA sequence is 5'GGGAGUCCCGCG3' The mRNA is formed from the template strand of the DNA 3-5 and the formed mRNA is from 5-3 prime.Here there is no thymine in the RNA and uracil is present which pairs with A.The guanine pairs with cytosine.Here there are three hydrogen bonds between guanine and cytosine and two hydrogen bonds between adenine and uracil.

The protein formed would be glycine,serine,proline and alanine.

If the DNA sequence is 3'ATAGCCTTTGGCAAC5’ then the mRNA sequence would be 5'UAUCGGAAACCGUUG3'.The protein sequence would be tyrosine,arginine,lysine,proline,leucine.Here the mRNA has codon.These codon are read in triplets and the tRNA has anticodon which assist in translation and brings the correct amino acids.

please ask the other question separately.