#1
Which phase of the cell cycle involves cell growth and DNA replication?
S phase
ExplanationCell growth and DNA replication occur.
#2
What is the correct sequence of phases in mitosis?
Prophase, Metaphase, Anaphase, Telophase
ExplanationProphase, Metaphase, Anaphase, Telophase represent the correct sequence of mitotic phases.
#3
Which of the following is true regarding cytokinesis?
It involves division of the cytoplasm
ExplanationCytokinesis involves the division of the cytoplasm.
#4
What is the primary function of the cell cycle checkpoints?
To prevent uncontrolled cell division
ExplanationCell cycle checkpoints prevent uncontrolled cell division.
#5
Which of the following structures are responsible for organizing microtubules during cell division?
Centrioles
ExplanationCentrioles organize microtubules during cell division.
#6
What is the purpose of homologous chromosomes?
To pair up during meiosis
ExplanationHomologous chromosomes pair up during meiosis.
#7
Which enzyme is responsible for unwinding the DNA double helix during DNA replication?
Helicase
ExplanationHelicase unwinds the DNA double helix during DNA replication.
#8
During which phase of meiosis do homologous chromosomes pair up and undergo crossing over?
Prophase I
ExplanationHomologous chromosomes pair up and undergo crossing over during Prophase I of meiosis.
#9
Which of the following is NOT a characteristic of cancer cells?
Repair of damaged DNA
ExplanationCancer cells do not efficiently repair damaged DNA.
#10
What happens during the S phase of the cell cycle?
Cell growth and DNA replication occur
ExplanationS phase involves cell growth and DNA replication.
#11
Which phase of the cell cycle is characterized by a cell's preparation for division?
G2 phase
ExplanationG2 phase is characterized by a cell's preparation for division.
#12
During which phase of meiosis does the nuclear envelope reform around the chromosomes?
Telophase I
ExplanationThe nuclear envelope reforms around chromosomes during Telophase I of meiosis.
#13
What is the role of spindle fibers during mitosis?
To move chromosomes to opposite poles of the cell
ExplanationSpindle fibers move chromosomes to opposite poles during mitosis.
#14
Which of the following accurately describes the difference between mitosis and meiosis?
Mitosis results in genetically identical daughter cells, while meiosis results in genetically diverse daughter cells
ExplanationMitosis results in genetically identical cells, while meiosis results in genetically diverse cells.
#15
What is the significance of crossing over during meiosis?
It increases genetic variation among offspring
ExplanationCrossing over in meiosis increases genetic variation among offspring.
#16
During which phase of the cell cycle does the cell commit to undergoing division?
G1 phase
ExplanationG1 phase is when the cell commits to undergoing division.
#17
What is the significance of independent assortment during meiosis?
It increases genetic variation by randomly distributing homologous chromosomes
ExplanationIndependent assortment in meiosis increases genetic variation by randomly distributing homologous chromosomes.