Cells: The Cell Cycle

Question 1

Can all cells divide?

Answer 1

• No, not all cells in multicellular organisms retain the ability to divide
- Eukaryotic cells that do divide show a cell cycle

Question 2

Different Stages of the Cell Cycle

Answer 2

• Interphase - period of cell growth and DNA replication
• Mitosis - period of cell division
• G0 phase - dormancy period during interphase, cell is neither replicating its DNA nor preparing to divide
• Interphase is subdivided into three different growth stages: G1, S and G2
• Cytokinesis - division of the cytoplasm occurs, producing two new cells

Question 3

G1

Answer 3

• Growth phase 1

• Cell grows
• New organelles and proteins are made

Question 4

S

Answer 4

• Synthesis phase

- DNA replication and synthesis

Question 5

G2

Answer 5

• Growth phase 2

• Cell keeps growing
• Proteins needed for cell division are made

Question 6

Describe when DNA replication and mitosis occur during the cell cycle

Answer 6

• DNA replication occurs during the interphase of the cell cycle
• Mitosis is the part of the cell cycle in which a eukaryotic cell divides to produce two daughter cells, each with the identical copies of DNA produced by the parent cell during DNA replication