This higher tier covers DNA Replication — Higher Detail within Mitosis and the Cell Cycle for GCSE Biology. Cell division by mitosis, cell cycle phases, chromosome behavior, cytokinesis differences, stem cells, cancer, and practical investigations It is section 5 of 19 in this topic. This section is most useful once the core foundation idea is secure, because it adds the detail that pushes answers higher.

🔬 DNA Replication — Higher Detail

Grade 7-9

At the molecular level, specific enzymes carry out DNA replication:

Helicase breaks the hydrogen bonds between base pairs, unwinding the double helix
DNA polymerase joins new nucleotides to the template strand, building the complementary copy
Proofreading mechanisms detect and repair errors — a single uncorrected error becomes a permanent mutation passed to all descendants of that cell

Practice questions for Mitosis and the Cell Cycle

What is mitosis?

A. Nuclear division producing two genetically identical cells
B. The formation of gametes with half the chromosome number
C. The fusion of two nuclei during fertilization
D. The process by which cells grow larger without dividing

1 markfoundation

Describe what happens during interphase to prepare a cell for mitosis.

3 marksstandard

Quick recall flashcards

Define mitosis

Mitosis is the process of nuclear division that produces two genetically identical diploid cells from one diploid cell. It is used for growth and repair in multicellular organisms.

Give three reasons why cells divide

1. Growth - increasing cell numbers for organism development 2. Repair - replacing damaged or dead cells 3. Asexual reproduction - creating identical offspring

DNA Replication — Higher Detail