#1
What is the main purpose of cell division in organisms?
To produce offspring
ExplanationCell division is essential for the reproduction and production of offspring in organisms.
#2
What is the term for the point where two sister chromatids are joined together in a chromosome?
Centromere
ExplanationThe centromere is the point where two sister chromatids are joined together in a chromosome.
#3
During which phase of mitosis do chromosomes align at the cell's equator?
Metaphase
ExplanationChromosomes align at the cell's equator during the Metaphase stage of mitosis.
#4
Which phase of the cell cycle is characterized by rapid cell growth and preparation for DNA replication?
G1 phase
ExplanationThe G1 phase is characterized by rapid cell growth and preparation for DNA replication.
#5
What happens during cytokinesis in animal cells?
Cell membrane pinches off
ExplanationDuring cytokinesis, the cell membrane pinches off, resulting in the separation of the two daughter cells in animal cells.
#6
What is the result of meiosis in terms of chromosome number in the daughter cells?
Haploid
ExplanationThe result of meiosis is the formation of haploid daughter cells, each with half the chromosome number of the parent cell.
#7
During which phase of the cell cycle does DNA replication occur?
S phase
ExplanationDNA replication takes place during the Synthesis (S) phase of the cell cycle.
#8
What is the role of centrioles in animal cell division?
Organizing the spindle fibers
ExplanationCentrioles play a crucial role in organizing and forming the spindle fibers during animal cell division.
#9
In which phase of meiosis do homologous chromosomes separate and move to opposite poles?
Anaphase I
ExplanationHomologous chromosomes separate and move to opposite poles during Anaphase I of meiosis.
#10
Which enzyme is responsible for unwinding the DNA double helix during replication?
DNA helicase
ExplanationDNA helicase is the enzyme that unwinds the DNA double helix during the replication process.
#11
What is the primary function of the spindle fibers during cell division?
Chromosome movement
ExplanationSpindle fibers play a key role in moving chromosomes to ensure proper segregation during cell division.
#12
What is the role of checkpoints in the cell cycle?
Controlling progression to the next phase
ExplanationCheckpoints in the cell cycle ensure proper conditions before allowing progression to the next phase.
#13
Which type of cell division results in the formation of gametes?
Meiosis
ExplanationMeiosis is the process of cell division that leads to the formation of gametes (sex cells) with half the chromosome number.
#14
What is the significance of crossing over during meiosis?
Increases genetic diversity
ExplanationCrossing over during meiosis results in the exchange of genetic material between homologous chromosomes, increasing genetic diversity.
#15
What is the significance of the G0 phase in the cell cycle?
Resting phase
ExplanationThe G0 phase is a resting phase in the cell cycle, where cells are not actively dividing.
#16
Which type of cell division is responsible for the growth and repair of multicellular organisms?
Mitosis
ExplanationMitosis is the type of cell division responsible for the growth and repair of multicellular organisms.
#17
What is the term for the point where non-sister chromatids exchange genetic material during meiosis?
Chiasma
ExplanationThe point where non-sister chromatids exchange genetic material during meiosis is called the chiasma.
#18
Which enzyme proofreads and repairs errors in DNA during replication?
DNA polymerase
ExplanationDNA polymerase is responsible for proofreading and repairing errors in DNA during the replication process.