a1.2.8 - role of complementary base pairing

Question 1

explain the role of complementary base pairing in maintaining the DNA sequence during DNA replication.

Answer 1

during DNA replication, the two strands of a “parent” DNA molecule are broken apart. each of these strands serves as a template for the creation of a new “daughter” strand. because of the base pairing rule, the parent template strand will always code for the complementary sequence of nucleotides in the daughter strand (A to T, C to G). the complementary base paring will maintain the sequence of the DNA from generation to generation.

Question 2

outline the role of complementary base pairing in transmitting the genetic code in transcription.

Answer 2

during transcription, one of the the two strands of a DNA molecule is used as a template for the creation of an RNA strand. because of the base pairing rule, the DNA template strand will always code for the complementary sequence of RNA nucleotides in the (A to U, C to G). the complementary base paring will maintain the sequence of the gene as mRNA is translated into protein.

Question 3

outline the role of complementary base pairing in transmitting the genetic code in translation.

Answer 3

during translation, an RNA strand is used as a template for the creation of a polypeptide. because of the base pairing rule, the mRNA codon will only bind with the complementary tRNA anticodon (A to U, C to G). the complementary base paring ensures the correct amino acid are brought in the correct sequence to the ribosome.