Describe the principle of the universal genetic code in which different triplets of DNA bases either code for specific amino acids or correspond to start and stop codons
1 Answer Describe the differences between leading strand and lagging strand replication as a consequence of DNA polymerase adding nucleotides only in a 5′ to 3′ direction
1 Answer Describe the linking of nucleotides by phosphodiester bonds
1 Answer Differences in hydrogen bonding between C–G and A–T base pairs
1 Answer Describe the importance of complementary base pairing between the 5′ to 3′ strand and the 3′ to 5′ strand (antiparallel strands)
1 Answer 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)
1 Answer Interpret photomicrographs, diagrams and microscope slides of cells in different stages of the mitotic cell cycle and identify the main stages of mitosis
1 Answer Outline the role of stem cells in cell replacement and tissue repair by mitosis
1 Answer Explain how uncontrolled cell division can result in the formation of a tumour
1 Answer Outline the role of telomeres in preventing the loss of genes from the ends of chromosomes during DNA replication
1 Answer
Sourav Pan
Sourav Pan
Sourav Pan
Sourav Pan
Sourav Pan
Sourav Pan
Sourav Pan
BNO Team