Welcome to the 9th Class Biology Chapter 5 MCQs Practice and Quiz Tests. We are presenting you with top MCQ questions from the 9th Class Biology Chapter 5 Cell Cycle.
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The cell cycle is a series of events that leads to the:
a) Formation of gametes
b) Division of the cytoplasm
c) Replication of DNA
d) Generation of energy
During which phase of the cell cycle does the cell primarily grow and carry out its normal functions?
a) G1 phase
b) S phase
c) G2 phase
d) M phase
The cell cycle is regulated by a family of proteins known as:
a) Ribosomes
b) Hormones
c) Cyclins and cyclin-dependent kinases (CDKs)
d) Receptors
Which phase of the cell cycle is characterized by the synthesis of DNA?
a) G1 phase
b) S phase
c) G2 phase
d) M phase
The phase of the cell cycle in which the cell prepares for division and checks for DNA
damage is:
a) G1 phase
b) S phase
c) G2 phase
d) M phase
The phase of the cell cycle in which the cell physically divides into two daughter cells is:
a) G1 phase
b) S phase
c) G2 phase
d) M phase
Which of the following accurately represents the order of the phases in the cell cycle?
a) G1 phase → M phase → S phase → G2 phase
b) M phase → S phase → G1 phase → G2 phase
c) G1 phase → S phase → G2 phase → M phase
d) S phase → G2 phase → G1 phase → M phase
The checkpoint that occurs near the end of G1 phase checks for:
a) DNA damage and replication errors
b) Completion of DNA replication
c) Cell size and nutrient availability
d) Proper alignment of chromosomes
The checkpoint that occurs before the cell enters the M phase ensures that:
a) DNA synthesis is complete
b) The cell is large enough for division
c) Chromosomes are properly aligned
d) All nutrients are available
The process of cell division is necessary for:
a) The growth of multicellular organisms
b) Repair of damaged tissues
c) Production of gametes
d) All of the above
Which of the following is the correct sequence of phases in the M phase of the cell cycle?
a) Prophase → Anaphase → Metaphase → Telophase
b) Telophase → Metaphase → Anaphase → Prophase
c) Prophase → Metaphase → Anaphase → Telophase
d) Metaphase → Prophase → Anaphase → Telophase
During which phase of the cell cycle do the sister chromatids line up at the cell’s equator?
a) Prophase
b) Metaphase
c) Anaphase
d) Telophase
The phase of mitosis in which the nuclear envelope re-forms and the chromatin condenses into chromosomes is:
a) Prophase
b) Metaphase
c) Anaphase
d) Telophase
In mitosis, the separation of sister chromatids to opposite poles of the cell occurs during:
a) Prophase
b) Metaphase
c) Anaphase
d) Telophase
The phase of mitosis in which the nuclear envelope breaks down and the chromosomes become visible is:
a) Prophase
b) Metaphase
c) Anaphase
d) Telophase
During cytokinesis in animal cells, the cell membrane is pinched inward to form two daughter cells by a process called:
a) Cleavage furrow formation
b) Cell plate formation
c) Mitotic spindle formation
d) Chromosome segregation
During cytokinesis in plant cells, a new cell wall is formed between the two daughter cells by the:
a) Formation of a cleavage furrow
b) Synthesis of new DNA
c) Assembly of a mitotic spindle
d) Formation of a cell plate
Which of the following checkpoints ensures that all chromosomes are properly attached to the mitotic spindle?
a) G1 checkpoint
b) S checkpoint
c) G2 checkpoint
d) Spindle checkpoint
The cell cycle can be arrested at specific checkpoints to:
a) Ensure accurate DNA replication
b) Repair DNA damage
c) Prevent the formation of tumors
d) All of the above
The spindle checkpoint prevents the onset of anaphase until:
a) DNA replication is complete
b) Chromosomes are properly aligned
c) The cell reaches a certain size
d) The nuclear envelope breaks down
The process by which a cell divides into two daughter cells is called:
a) Mitosis
b) Cytokinesis
c) Interphase
d) Meiosis
The protein responsible for coordinating the events of the cell cycle is called:
a) Cyclin
b) CDK
c) Cyclin-dependent kinase
d) All of the above
The G1 phase of the cell cycle is mainly focused on:
a) DNA replication
b) Growth and preparation for DNA replication
c) Cell division
d) Chromosome segregation
The G2 phase of the cell cycle is mainly focused on:
a) DNA replication
b) Growth and preparation for cell division
c) Chromosome segregation
d) Formation of the mitotic spindle
The process of cytokinesis is distinct from mitosis because cytokinesis:
a) Occurs in the cytoplasm, not the nucleus
b) Involves the separation of sister chromatids
c) Takes place during the G1 phase
d) Is controlled by cyclin-dependent kinases
The protein complex that is activated by cyclins and promotes cell cycle progression is called:
a) CDK
b) Cyclin
c) Cyclin-dependent kinase
d) Replicase
The cell cycle is tightly regulated to ensure that:
a) DNA replication occurs before cell division
b) Cells undergo mitosis at the same time
c) All cells in an organism divide at the same rate
d) Cells divide only when necessary and appropriate
The restriction point (R point) in the G1 phase is responsible for:
a) Checking for DNA damage
b) Initiating DNA replication
c) Committing the cell to enter S phase and continue the cell cycle
d) Stopping the cell cycle if the cell is not large enough
The G1/S checkpoint checks if the cell is ready to:
a) Enter mitosis
b) Initiate cytokinesis
c) Replicate its DNA
d) Begin the G1 phase
Which of the following represents the correct order of phases in the cell cycle?
a) G1 → S → G2 → M
b) M → G1 → S → G2
c) S → G1 → G2 → M
d) G2 → S → G1 → M
The G2/M checkpoint ensures that all DNA is replicated correctly before the cell enters:
a) G1 phase
b) S phase
c) G2 phase
d) M phase
The G1 checkpoint is also known as the:
a) S checkpoint
b) G2/M checkpoint
c) Restriction point
d) Spindle checkpoint
The cell cycle control system is similar to a:
a) Stopwatch
b) Switch
c) Timer
d) Clock
The G2/M checkpoint ensures that the cell:
a) Completes DNA replication
b) Begins DNA replication
c) Enters the G1 phase
d) Begins mitosis
A cell in the G0 phase is:
a) Dividing actively
b) Preparing for division
c) In a resting state, not actively dividing
d) Replicating its DNA
The phase of the cell cycle during which the cell is not actively dividing is called:
a) G0 phase
b) S phase
c) G2 phase
d) M phase
The G1 checkpoint is critical for determining whether the cell should:
a) Continue with DNA replication
b) Enter the G2 phase
c) Begin mitosis
d) Enter a resting state or proceed with the cell cycle
The protein responsible for regulating the progression of the cell cycle is called a:
a) Ribosome
b) Cyclin
c) Centrosome
d) Mitochondrion
The G2 checkpoint ensures that the cell:
a) Begins mitosis
b) Is large enough to divide
c) Completes DNA replication and repair
d) Initiates cytokinesis
Which of the following is not a phase of the cell cycle?
a) Interphase
b) Prophase
c) Metaphase
d) Telophase
The cell cycle is a tightly regulated process to prevent:
a) Uncontrolled cell division and tumor formation
b) Cell shrinkage and dehydration
c) Premature DNA replication
d) Unnecessary cell growth
During which phase of the cell cycle does cell growth and metabolic activity occur?
a) G1 phase
b) S phase
c) G2 phase
d) M phase
The protein responsible for activating CDKs and driving the cell cycle forward is called:
a) Cyclin
b) Centromere
c) Chromatid
d) Centriole
During which phase of the cell cycle are the sister chromatids separated and pulled to opposite poles of the cell?
a) Prophase
b) Metaphase
c) Anaphase
d) Telophase
The protein complex formed by the binding of cyclin to CDK is called:
a) A cyclin-CDK inhibitor
b) A cyclin-CDK activator
c) A cyclin-CDK complex
d) A cyclin-CDK checkpoint
The spindle checkpoint is also known as the:
a) G1 checkpoint
b) G2/M checkpoint
c) S checkpoint
d) Metaphase checkpoint
The protein complex that holds the sister chromatids together is called the:
a) Centromere
b) Centrosome
c) Spindle checkpoint
d) Cyclin-CDK complex
The cell cycle is divided into two main phases: interphase and:
a) Anaphase
b) Metaphase
c) Telophase
d) Mitosis
The cell cycle is regulated by the production and degradation of:
a) Cyclins
b) Centromeres
c) Centrioles
d) Spindles
In the G1 phase, the cell mainly prepares for:
a) Mitosis
b) DNA replication
c) Cytokinesis
d) Cell division
During which phase of the cell cycle does the cell replicate its DNA?
a) G1 phase
b) S phase
c) G2 phase
d) M phase
The G1 checkpoint ensures that the cell is ready to:
a) Enter the G2 phase
b) Begin the cell cycle
c) Replicate its DNA
d) Continue the cell cycle or enter a resting state
The protein complex responsible for initiating the breakdown of cyclins is called:
a) A cyclin-CDK inhibitor
b) A cyclin-CDK activator
c) A cyclin-CDK checkpoint
d) A cyclin-CDK complex
The protein complex responsible for activating cyclin-dependent kinases (CDKs) is called:
a) A cyclin-CDK inhibitor
b) A cyclin-CDK activator
c) A cyclin-CDK checkpoint
d) A cyclin-CDK complex
The protein complex responsible for monitoring the integrity of the spindle fibers is called:
a) A cyclin-CDK inhibitor
b) A cyclin-CDK activator
c) A cyclin-CDK checkpoint
d) A cyclin-CDK complex
The protein complex responsible for holding the sister chromatids together is called the:
a) Centromere
b) Centrosome
c) Spindle checkpoint
d) Cyclin-CDK complex
Which of the following is the correct order of phases in the cell cycle?
a) G1 → S → G2 → M
b) M → G1 → S → G2
c) S → G1 → G2 → M
d) G2 → S → G1 → M
The process by which a cell divides into two daughter cells is called:
a) Mitosis
b) Cytokinesis
c) Interphase
d) Meiosis
The protein responsible for regulating the progression of the cell cycle is called a:
a) Ribosome
b) Cyclin
c) Centrosome
d) Mitochondrion
The G2/M checkpoint ensures that the cell:
a) Begins mitosis
b) Is large enough to divide
c) Completes DNA replication and repair
d) Initiates cytokinesis
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