Gene Expression BellRinger

Which best explains why muscle cells are different from blood cells?

• Muscle cells are produced by the brain, but blood cells are produced by the heart. 
• Different genes are activated in muscle cells than in blood cells. 
• Muscles cells experience different environmental influences than blood cells. 
• A mutation occurs during the development of muscle cells but not in blood cells. 

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How can a person's muscle cells have the same exact DNA sequences as their nerve cells even though the look and perform completely different?

• The two different cells become mutated

• The proteins expressed in each cell are different

• They actually have different DNA in the two types of cells.

• The genome of the different cells changes

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The process by which a cell becomes specialized for a specific structure or function.

• cell multiplication
• cell division
• mitosis
• cell differentiation

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What is cell differentiation?

• The process where unspecialized cells become different in structure and function.

• When DNA controls the cell cycle.

• The ability of cells to make more cells.

• The ability of cells to maintain homeostasis.

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Cells that have the ability to become any type of specialized cell in the body are called:

• cell membranes

• stem cells

• nerve cells

• cardiac cells

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All our cells, except sex cells like eggs or sperm, have ___________ DNA

• different
• similar
• exactly the same
• half the amount of 

How do stem cells know what type of cells to differentiate into?

• The nucleus has instructions to turn some genes on and some genes off.
• Signals from chemicals in the organism or from the environment determine which genes will be turned on and off.
• Genes turn on and off randomly.
• The cell has unique DNA that determines what the cell will become.

Specialized Cells have...

• All of their genes switched ON

• All of their genes switched OFF

• Some of their genes switched OFF

• I don't know they like can choose?!?!

Gene regulation is the process that is used to:

• help make sugars for cells in plants.

• make glycosomes in cells.

• turning genes on and off.

• Not sure, need help.

The Himalayan rabbit’s habitat has cold, snowy winters and mild summers. The body is typically covered in white fur except for the nose, feet, tail, and ears, which are covered in black fur.

A scientist shaved an area of white fur on the back of a Himalayan rabbit and placed an ice pack over the shaved area. The shaved area grew black fur.

Which of these best explains why the hair that grew back where the ice pack was placed was black and not white?

• The genes for black hair were activated by specific temperatures.

• The white hair mutated to black hair as the rabbit’s body temperature decreased.

• The coat color changed from white to black with the age of the rabbit.

• White hair only grows during certain times of the year.

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