Question

notes: the stages of the cell cycle

1. all living things are made of _. for an organism to grow, these cells must _ to make more cells.
2. the process of cellular division is very important because it makes every cell in an organism _.
3. most of the cell’s time is spent _ to divide during interphase.

• interphase = _ of the cell cycle

interphase

1. interphase has _ important stages.

• the gaps between activity when the cell grows and performs normal cellular processes.
• _ = _
• (s) phase - dna _

g0 resting phase: cells are not preparing to divide
interphase: dna replication

1. every cell needs a complete set of dna.

• dna must be _ (copied) to make 2 complete sets during the s phase.

1. step 1: the dna _ and the two strands must _ between the nitrogenous bases
2. step 2: the dna polymerase enzymes add nucleotides to create _
3. dna replication is a semi - conservative process.

• each set of dna contains _ strand and _ strand.

Explanation:

1. All living things are composed of cells, and for growth, cells must divide.
2. Cellular division is crucial for cell - identity maintenance in an organism.
3. Most of a cell's time is in interphase, which is about 90% of the cell cycle.
4. Interphase has three stages: G1 (cell growth and normal functions), S (DNA replication), and G2 (pre - division preparation). In DNA replication, DNA is replicated (copied) in S phase. The DNA double - helix unwinds, and the hydrogen bonds between nitrogenous bases break. DNA polymerase adds nucleotides to create new complementary strands. DNA replication is semi - conservative, with each new DNA set having one old strand and one new strand.

Answer:

1. cells; divide
2. identical
3. preparing; 90%
4. three; G1; cell growth and normal functions; Synthesis; replication

Interphase: DNA Replication

1. replicated
2. double - helix unwinds; break
3. new complementary strands
4. one old; one new