Cycles of Cell Cycle
A cell has just completed G1. What major process must occur next before mitosis can eventually begin? Give the name
DNA replication during S Phase
Chromosomes are lined up across the center of a cell. What stage of mitosis is occurring?
Metaphase
A cell increases in size, produces proteins, and performs its normal functions. What phase of the cell cycle is the cell most likely in?
G1
The division of the cytoplasm of the cell during cell division is referred to as_____________.
Cytokinesis
Sister chromatids are being pulled toward opposite sides of the cell. What stage is occurring, and why is this movement important?
Anaphase
A scientist observes that a cell has doubled its DNA but has not yet divided. What phase must the cell have already completed?
S Phase
A student says, “Mitosis creates four genetically different cells.” Identify and correct the student's error.
Mitosis produces two genetically equivalent daughter cells;
A student observes chromosomes becoming visible while the nuclear membrane begins breaking down. Identify the stage and give one piece of evidence supporting your answer.
Prophase
A chemical prevents DNA replication. Predict what will happen to cells attempting to progress through the cell cycle and explain why.
Cells cannot successfully proceed toward division because DNA must be copied first
A cell has completed DNA replication. Why must the DNA be replicated before mitosis rather than after it?
Each daughter cell needs a complete copy of the genetic information
A drug prevents spindle fibers from attaching to chromosomes. Which stage of mitosis would be directly disrupted, and how could this affect the daughter cells?
Metaphase/anaphase transition; daughter cells may receive unequal chromosome numbers
A cell contains 12 chromosomes before DNA replication. How many chromosomes will each daughter cell contain after normal mitosis and cytokinesis? Explain your reasoning.
12 chromosomes because mitosis maintains chromosome number
During telophase, chromosomes have reached opposite ends of the cell. Predict two structural changes that should occur next.
2 new nuclei forms , Cleavage Furrow forms
Scientists discover cells that continuously enter mitosis without responding to signals telling them to stop dividing. Explain how this change could affect the organism and identify the biological condition that could result.
Uncontrolled cell division/tumor formation/cancer.