Question

plant cells have cell walls and a nucleus. *
a. true
b. false
mitosis is the longest stage of the cell cycle. *
a. true
b. false
dna is replicated during interphase. *
a. true
b. false

Explanation:

First Question: "Plant cells have cell walls and a nucleus."

Plant cells are eukaryotic, so they have a nucleus. They also have a rigid cell wall (composed of cellulose) for structure. So the statement is true.

The cell cycle has interphase (G₁, S, G₂) and mitotic phase (mitosis + cytokinesis). Interphase, especially G₁, is the longest as the cell grows, replicates DNA, and prepares for division. Mitosis is relatively short. So the statement is false.

Interphase has three parts: G₁ (growth), S (synthesis, where DNA replication occurs), and G₂ (preparation for mitosis). So DNA replication happens in the S phase of interphase. The statement is true.

Answer:

A. True

Second Question: "Mitosis is the longest stage of the cell cycle."