Question

which 2 stages in interphase have checkpoints? *
g1 & s phase
g2 & s phase
g1 & g2 phases
mitosis & cytokinesis
what is the longest phase of the cell cycle? *
interphase
gap 2
mitosis
cytokinesis
what process occur during s phase? *
dna replication
cell division
cell growth
organelle reproduction

Explanation:

First Question:

Interphase has G1, S, and G2 phases. Checkpoints in interphase are at G1 (to check for cell size, nutrients, growth factors, DNA damage) and G2 (to check for DNA replication completeness and damage). S phase doesn't have a checkpoint in the same way, and Mitosis & Cytokinesis are not interphase. So G1 & G2 Phases are the correct choice.

The cell cycle has interphase (G1, S, G2) and the mitotic phase (mitosis and cytokinesis). Interphase is where the cell grows, replicates DNA, and prepares for division. It takes much longer than the relatively short mitotic phase. Gap 2 is part of interphase, mitosis and cytokinesis are shorter. So Interphase is the longest.

S phase (synthesis phase) of the cell cycle is when DNA replication occurs. Cell division is mitosis/cytokinesis, cell growth is in G1 and G2, organelle reproduction is in G1 and G2. So DNA Replication happens in S phase.

Answer:

C. G1 & G2 Phases

Second Question: