During transcription, base pairing occurs between nucleotides. Fig. 3.1 is a diagram to show complementary base pairing between a DNA nucleotide and an RNA nucleotide. Only the base pair is shown in molecular detail. Fig. 3.1 Identify and describe the DNA-RNA nucleotide pair shown in Fig. 3.1. You may add labels and annotations to Fig. 3.1 if you wish. ............................................................................................................................................... . ............................................................................................................................................... . ............................................................................................................................................... . ............................................................................................................................................... . ............................................................................................................................................... . ............................................................................................................................................... . ............................................................................................................................................... . .........................................................................................................................................

Biology

IGCSE&ALevel

CAIE

Exam No：9700_w24_qp_22 Year：2024 Question No：3(b)

Answer:

Knowledge points:

6.1.1 describe the structure of nucleotides, including the phosphorylated nucleotide ATP (structural formulae are not expected)

6.1.2 state that the bases adenine and guanine are purines with a double ring structure, and that the bases cytosine, thymine and uracil are pyrimidines with a single ring structure (structural formulae for bases are not expected)

6.1.3.1 the importance of complementary base pairing between the 5' to 3' strand and the 3' to5' strand (antiparallel strands)

6.1.3.2 differences in hydrogen bonding between C–G and A–T base pairs

6.1.3.3 linking of nucleotides by phosphodiester bonds

6.1.4.1 the roles of DNA polymerase and DNA ligase (knowledge of other enzymes in DNA replication in cells and different types of DNA polymerase is not expected)

6.1.4.2 the differences between leading strand and lagging strand replication as a consequence of DNA polymerase adding nucleotides only in a 5 to 3 direction

6.1.5 describe the structure of an RNA molecule, using the example of messenger RNA (mRNA)

Answer:

Knowledge points:

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