#1
Which phase of the cell cycle is characterized by DNA replication?
G1 phase
S phase
G2 phase
M phase
#2
What is the correct sequence of stages in the cell cycle?
G1 phase -> S phase -> G2 phase -> M phase
G1 phase -> G2 phase -> S phase -> M phase
G2 phase -> G1 phase -> M phase -> S phase
S phase -> G1 phase -> M phase -> G2 phase
#3
What is the purpose of cytokinesis in the cell cycle?
To replicate DNA
To ensure proper alignment of chromosomes
To divide the cytoplasm and separate the daughter cells
To initiate the process of cell division
#4
Which enzyme is responsible for unwinding DNA during replication?
DNA polymerase
RNA polymerase
Helicase
Ligase
#5
What is the purpose of the G1 checkpoint in the cell cycle?
To ensure proper alignment of chromosomes
To check for DNA damage
To separate sister chromatids
To initiate cytokinesis
#6
Which of the following is a characteristic of haploid cells?
They contain two sets of chromosomes
They are produced by meiosis
They undergo DNA replication
They are found in somatic tissues
#7
What is the function of the protein complex APC/C in the cell cycle?
To promote DNA replication
To initiate cytokinesis
To degrade cyclins
To activate cyclins
#8
Which phase of the cell cycle follows mitosis?
Interphase
G1 phase
S phase
G2 phase
#9
What is the role of the protein p53 in the cell cycle?
To promote cell division
To inhibit apoptosis
To arrest the cell cycle in response to DNA damage
To degrade cyclins
#10
Which phase of the cell cycle is characterized by cell growth and preparation for DNA replication?
G1 phase
S phase
G2 phase
M phase
#11
Which checkpoint ensures that the DNA is undamaged before entering mitosis?
G1 checkpoint
G2 checkpoint
M checkpoint
S checkpoint
#12
What is the significance of meiosis in sexual reproduction?
To produce genetically identical offspring
To produce haploid gametes
To increase genetic variation
To produce diploid cells
#13
What happens during interphase of the cell cycle?
Cell division occurs
DNA replication occurs
Chromosomes condense
Chromosomes align at the metaphase plate
#14
Which of the following is a characteristic of cancer cells?
Uncontrolled cell division
Strict adherence to cell cycle checkpoints
Normal functioning of tumor suppressor genes
Decreased angiogenesis
#15
What is the role of cyclin-dependent kinases (CDKs) in cell cycle regulation?
To degrade cyclins
To activate cyclins
To inhibit cyclins
To phosphorylate target proteins
#16
What is the primary function of the G2 checkpoint?
To check for DNA damage
To ensure proper alignment of chromosomes
To initiate cytokinesis
To separate sister chromatids
#17
During which phase of meiosis do homologous chromosomes separate?
Prophase I
Metaphase I
Anaphase I
Telophase I
#18
What is the role of the enzyme telomerase in cell division?
To replicate DNA
To degrade telomeres
To lengthen telomeres
To initiate cytokinesis
#19
What is the outcome of meiosis II?
Formation of haploid daughter cells
Formation of diploid daughter cells
Formation of genetically identical daughter cells
Formation of sister chromatids
#20
What is the function of checkpoints in the cell cycle?
To speed up cell division
To promote mutations
To ensure accurate progression through the cell cycle
To degrade cyclins
#21
During which phase of mitosis do chromosomes align at the metaphase plate?
Prophase
Metaphase
Anaphase
Telophase
#22
What is the role of spindle fibers during mitosis?
To attach sister chromatids to each other
To separate sister chromatids and move them to opposite poles
To replicate DNA
To initiate cytokinesis
#23
What is the consequence of a mutation in a tumor suppressor gene?
Increased cell proliferation
Decreased cell proliferation
Increased DNA repair
Decreased apoptosis
#24
What is the significance of crossing over during meiosis?
It increases the number of chromosomes in daughter cells
It leads to genetic diversity
It ensures proper alignment of chromosomes
It initiates cytokinesis
#25
Which phase of mitosis is characterized by the physical separation of sister chromatids?
Prophase
Metaphase
Anaphase
Telophase