Question

people who have leukemia, a cancer that affects white blood cells, are often given cyto this drug inhibits the synthesis of dna. which phase of the cell cycle is most affected by cytarabine?
s phase
g2 phase
g1 phase
mitosis
question 13
what happens in mitosis?
cell creates two cells with different dna
cell divides its cytoplasm
cell copies its dna
cell divides its dna

Explanation:

• First question:
• In the cell cycle, the S phase (synthesis phase) is when DNA replication occurs. Since Cytarabine inhibits DNA synthesis, it most affects the S phase.
• G1 phase is for cell growth and preparation for DNA synthesis. G2 phase is for preparation for mitosis. Mitosis is for cell division of the nucleus.
• Second question:
• Mitosis results in two daughter cells with the same DNA as the parent cell (so "Cell creates two cells with different DNA" is wrong).
• DNA copying (replication) occurs in the S phase (so "Cell copies its DNA" is wrong).
• Mitosis is about division of the nucleus (distribution of DNA), and cytokinesis is about division of the cytoplasm. But among the options, "Cell divides its DNA" is the most relevant as mitosis ensures an equal distribution of replicated DNA into two daughter nuclei.

Answer:

• First question: S phase
• Second question: Cell divides its DNA