The Cell Cycle And Differentiation

Question 1

The cell cycle

Answer 1

• the process that all body cells from multicellular organisms to grow and divide
• starts when cells have been produced by cell division and ends with the cell dividing into 2 identical cells

Question 2

Interphase

Answer 2

• cell carries out normal functions whilst preparing to divide
• DNA unravels and replicates to double genetic content
• organelles replicate and ATP content increased

Question 3

Mitosis

Answer 3

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Question 4

How is DNA replicated?

Semi-conservative replication

Answer 4

• 1- DNA helicase breaks the hydrogen bonds. The helix unzips to form 2 single stands
• 2- single strands act as a template for a new strand. Free-floating DNA joins to exposed bases
• 3- nucleotides on new strands join by the enzyme DNA polymerase. Hydrogen bonds form.
• each new DNA molecule contains 1 original strand and 1 new strand