6.1. Structure of nucleic acids and replication of DNA
A subsection of Biology, 9700, through 6. Nucleic acids and protein synthesis
Listing 10 of 244 questions
Table 4.1 shows a sequence of 12 nucleotides in the template strand of a short length of a DNA molecule, the corresponding primary transcript and the four amino acids coded for by the sequence. The table is incomplete. Complete Table 4.1 to show the sequence of nucleotides in the primary transcript that would result from transcription of this short length of DNA. Table 4.1 position of nucleotide DNA template strand C A C T A C T C C A A C primary transcript amino acid aa1 aa2 aa3 aa4 Table 4.2 shows all the possible template strand DNA triplets that code for the amino acids labelled aa1, aa2, aa3 and aa4 in Table 4.1. Table 4.2 amino acid DNA triplets val CAA, CAG, CAT, CAC arg GCA, GCG, GCT, GCC, TCT, TCC met TAC leu AAT, AAC, GAA, GAG, GAT, GAC Complete Table 4.3 to identify the four amino acids labelled aa1, aa2, aa3 and aa4 in Table 4.1. Table 4.3 aa1 aa2 aa3 aa4 amino acid One type of gene mutation is caused by the substitution of a DNA nucleotide. Using the information in Table 4.2, state and explain the effect on the final protein structure of a substitution of the nucleotide at position 3 in Table 4.1. A second type of gene mutation is caused by the deletion of a DNA nucleotide. Using the information in Table 4.2, state and explain the effect on the final protein structure of a deletion of the nucleotide at position 3 in Table 4.1. Replication of nuclear DNA occurs just once in every mitotic cell cycle. Six named events associated with the mitotic cell cycle are listed. The events are not listed in any particular order. Draw a circle around each event where replication of nuclear DNA occurs. cytokinesis interphase S phase G2 phase G1 phase mitosis Outline how DNA is replicated inside the nucleus. shows the structure of an ATP molecule. N N N N NH2 O O P O OH OH A OH O OH O OH O P O P HO State the name of the part of the ATP molecule labelled A in .
9700_m24_qp_22
THEORY
2024
Paper 2, Variant 2
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244