Homeostasis

As conditions change inside and outside the cell, the cell must adjust to maintain a stable internal environment. Which of the following is NOT an example of how cells maintain homeostasis?

• The cell membrane regulates what enters and exits the cell.

• The nucleus contains all the genetic information of the cell.

• Lysosomes break down molecules to excrete from the cell.

• A cell began to repair skin cells through the process of mitosis.

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Which of the following is the best definition for homeostasis?

• The movement of particles from one side of a cellular membrane to another.

• The tendency of particles to distribute themselves evenly across a membrane.

• The ability to maintain and regulate stable internal conditions of the cell.

• The transfer of molecules in response to excess solute relative to a solution.

Plants have openings on their leaves called stomata, through which gases, including water vapor, can pass in and out of the plant. Plants open and close stomata in

order to regulate the exchange of gases with the atmosphere. Why might it

benefit plants to keep their stomata closed under certain conditions?

• To reduce water loss during a drought

• To increase energy production at night

• To decrease the need for nutrients

• To prevent predation of insects

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Living things maintain homeostasis by getting rid of waste. Which of the following is another way living things maintain homeostasis?

• Hiding from predators

• Attracting a mate

• Extracting energy from food

• Moving through their environment

Process where food is broken down to release chemical energy. Occurs in the mitochondria.

• Cellular Respiration
• Photosynthesis
• Active Transport
• Passive Transport

In order to sustain life, all cells must...

• digest nutrients and water
• excrete waste and fluids
• must be able to maintain a homeostasis environment (aka cellular respiration and regulation)
• All of the above

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Which is NOT part of the Cell Theory

• New cells are produced from existing cells
• All living things are composed of cells
• Only eukaryotic cells have a nucleus
• Cells are the basic unit of structure & function in living things

How does photosynthesis benefit heterotrophs?

• It adds carbon dioxide to the air

• It creates food that they can eat

• It eliminates harmful sugars

• It creates clean water

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Cell Respiration is a cell process that only happens in animals.

• false

• true

Why do some cells in multi-cellular organisms repeatedly divide to make more cells?

• so the organism can grow
• to produce more food
• to remove wastes

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