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Chapter 12- The Cell Cycle Answer Key

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Cell Cycle
#1

The chromosomes are separated and are moving toward the poles.
This phase is called___________?

 

 

 

Anaphase.

#2

Chromosomes have coiled.

Chromosomes are duplicated.

The Nucleolos begins to disappear.

Mitotic Spindle begins to form.

Nuclear Envelope disappears.

 

This phase in Mitosis is called_______________?

Prophase.

#3

What is happening with the cell during G1, S, G2, and M phases?

During G1 phase: 

  • Growth
  • Increase in size
  • New proteins and organelles made.

 

During S phase:

  • Synthesizing DNA
  • Occurs in nucleus

 

During G2 phase:

  • Growth and preparation for cell division

 

During M phase:

  • Mitosis and Cytokinesis occur
#4

This is the phase in the cycle in which the cell spends the majority of its time in preparation for cell division.

Interphase.

#5

What happens in Prometaphase?

Nuclear membrane breaks down.

Kinetochore microtubules attach to kinetichores.

Polar microtubules push against each other moving centrosomes apart.

Cell Cycle (Continued)
#1

This phase in Mitosis is called______________?

 

Metaphase.

#2

This phase in Mitosis is called__________?

 

Telophase.

#3

This phase in Mitosis is called____________?

 

Cytokinesis.

#4

In Mitosis, this process is called______________?

Cleavage. Tongue Out

#5

What is this overarching process called?

Cell Division.

Vocabulary
#1

The haploid set of chromosomes in a gamete or microorganism, or in each cell of a multicellular organsism.

Genome.

#2

They are generated when a single chromosome is replicated into two copies of itself. These copies are called________________?

Sister Chromatids.

#3

This factor influences the cell cycle. This factor typically acts as a signaling molecule betweeen cells. It often promotes cell diffrentiation and maturation. 
This is called the ____?_____ Factor.

Growth Factor.

#4

A mature haploid male or female germ cell that is able to unite with another of the opposite sex in sexual reproduction to form a zygote are called ______________?

Gametes.

#5

Several points in the eukaryotic cell cycle at which the progression of a cell to the next stage in the cycle can be halted until conditions are favorable. These points are called __________?

Checkpoints.

Define The Term
#1

Define Binary Fission.

It is a form of asexual reproduction and cell division used by all prokaryotes.

 

#2

A Centromere is?

The part of the chromosome that links sister chromatids.

#3

The Centrosome is?

An organelle that serves as the main microtubule organizing center as well as a regulator of cell-cycle progression.

#4

Chromatin is?

The combination or complex of DNA and proteins that make up the contents of the nucleus of a cell.

#5

Somatic Cells are?

Any cell of a living organism other than the reproductive cells.

More About Mitosis!
#1

Define Mitosis.

A type of cell division resulting in two identical daughter cells.

#2

What is the job of the mitotic spindle?

It segregates chromosomes to two daughter cells during mitosis.

#3

________  ___  _________ is a particular sequence in a genome at which replication is initiated.

 

*Hint* Three words.

Origin of Replication.

#4

Sometimes cells can turn into cancer cells. This process is called?

Transformation.

#5

What are the roles of Cyclins and Cyclin-Dependent Kinases in the G1 phase? 

Cyclin and the cyclin dependent kinases (CDKs) are the principle regulators of cell cycle progression through activation of cell cycle checkpoints.

These are the core mechanism which drives the irreversible transitions that must be successfully negotiated for cells to successfully navigate the cell cycle and proliferate.

During G1 phase there are a series of critical criteria that must be met for cells to proceed to S phase.

These criteria and those necessary for cells to reenter the cell cycle through G1 phase, are governed by a subset of the cyclin/CDKs.

They are specifically activated during G1 phase, and are responsible for rendering cells permissive for irreversible entry into S phase and continued proliferation or, alternatively, retirement from the cell cycle to become senescent, quiescent or to terminally differentiate.

Final Question

What is a tumor?

A cluster of cancer cells.