MCQ
During which phase of the cell cycle does the cell check for DNA errors before mitosis begins?
A. G1 phase
B. S phase
C. G2 phase
D. Cytokinesis
C. G2 phase
What is cytokinesis?
Division of the cytoplasm.
Interphase is the ___ stage of the cell cycle.
Longest.
What are the four stages of mitosis (in order)?
Prophase, Metaphase, Anaphase, Telophase.
Which part of the cell cycle does the cell spend most of its time in?
Interphase.
What would happen if DNA did NOT replicate before mitosis?
A. The daughter cells would have double the DNA
B. The daughter cells would receive half the needed DNA
C. The cell would skip mitosis
D. Chromosomes would still separate normally
The daughter cells would receive half the needed DNA
What do we call two identical copies of a chromosome?
sister chromatids.
What happens during the G1 phase
Cell grows and carries out normal functions.
In which stage do chromosomes line up in the middle of the cell?
Metaphase.
What is the main purpose of mitosis?
To produce two identical daughter cells.
Which structure attaches to chromosomes and helps pull sister chromatids apart?
A. Centriole
B. Spindle fibers
C. Vesicles
D. Ribosomes
Spindle fibers
What holds sister chromatids together?
Centromere.
What happens during the S phase?
DNA replication.
In which stage do sister chromatids separate?
Anaphase.
Which phase of the cell cycle comes immediately after mitosis?
Cytokinesis
A cell with damaged DNA keeps dividing rapidly without control. Which of the following BEST describes this situation?
A. Normal growth
B. Apoptosis
C. Regeneration
D. Cancer formation
D. Cancer formation
A cell with 46 chromosomes divides to form two cells with ___ chromosomes each
46.
What happens during the G2 phase?
Final growth and preparation for mitosis.
In which stage does the nuclear membrane reappear?
Telophase.
What happens if cell division becomes uncontrolled?
A tumor or cancer may form.
During which mitosis stage do chromosomes appear as TWO separate sister chromatids being pulled toward opposite poles?
A. Prophase
B. Metaphase
C. Anaphase
D. Telophase
C. Anaphase
What structure controls movement of chromosomes during mitosis?
Spindle fibers.
Why is DNA replication important before mitosis?
So each daughter cell receives an identical copy of DNA
In which stage do chromosomes condense and become visible?
Prophase.
Why do skin cells divide more frequently than nerve cells?
Because skin cells must constantly replace damaged or dead cells.