Question

what is the purpose of checkpoints in the cell cycle?
to speed up division
to make cells divide into different types
to make sure cells are healthy and dna is correct before dividing
to stop all cells from dividing

which stage of the cell cycle involves copying dna?
g1 phase
s phase
g2 phase
mitosis

what is the difference between benign and malignant tumors?
benign tumors spread to other tissues, malignant tumors do not.
benign tumors do not spread, malignant tumors can spread.
benign tumors are always cancerous, malignant tumors are not.

Explanation:

1. Checkpoints in the cell cycle monitor cell health and DNA integrity before division to prevent errors.
2. The S - phase (synthesis phase) of the cell cycle is when DNA replication occurs.
3. Benign tumors are non - invasive and do not spread, while malignant tumors are invasive and can metastasize to other tissues.

Answer:

1. To make sure cells are healthy and DNA is correct before dividing
2. S Phase
3. Benign tumors do not spread, malignant tumors can spread.