molecular bio & genetics - DNA replication
CERTIFICATION GUIDE
FOR 2025/2026 TESTS|MOST COMMON
QUESTIONS WITH CORRECTLY VERIFIED ANSWERS
(LATEST QUIZZES) |ALREADY A+
GRADED|GUARANTEED PASS
what phase of the cell cycle does DNA replication occur? (eukaryotes) - S phase
what factors required for DNA replication to be carried out in prokaryotes? - sigma
factors
what amino acid changes causes a change in protein shape? - 1) when a change in AA
charge occurs eg 2 negatives will repel
2) AA change from non-polar to polar
3) hydrophilic to hydrophobic
mechanism to preserve DNA (3) - 1) nuclear envelope (2 mems, contain nuclear pore
complex, molecule require NLS to enter through pore)
2) condensation of chromatin when genes are inactive
3) semi conservative rep
chromatin made up of 4 histones what types? what does this make? - H2A, H2B, H3, H4,
makes an octamer
what type of histone acts as a clamp - H1 (prevent unwinding)
enzymes involved in DNA rep (5) - 1) DNA helicase
2) DNA primase
3) DNA polymerase
4) DNA ligase
CERTIFICATION GUIDE
FOR 2025/2026 TESTS|MOST COMMON
QUESTIONS WITH CORRECTLY VERIFIED ANSWERS
(LATEST QUIZZES) |ALREADY A+
GRADED|GUARANTEED PASS
what phase of the cell cycle does DNA replication occur? (eukaryotes) - S phase
what factors required for DNA replication to be carried out in prokaryotes? - sigma
factors
what amino acid changes causes a change in protein shape? - 1) when a change in AA
charge occurs eg 2 negatives will repel
2) AA change from non-polar to polar
3) hydrophilic to hydrophobic
mechanism to preserve DNA (3) - 1) nuclear envelope (2 mems, contain nuclear pore
complex, molecule require NLS to enter through pore)
2) condensation of chromatin when genes are inactive
3) semi conservative rep
chromatin made up of 4 histones what types? what does this make? - H2A, H2B, H3, H4,
makes an octamer
what type of histone acts as a clamp - H1 (prevent unwinding)
enzymes involved in DNA rep (5) - 1) DNA helicase
2) DNA primase
3) DNA polymerase
4) DNA ligase
