Cell Transport

Open Ended

Try and remember back when we looked at homeostasis a couple weeks ago, what is homeostasis? Give a brief description of homeostasis.

Multiple Choice

Which of the following is an example of a stimulus that could disrupt homeostasis in the human body?

• A sudden drop in external temperature

• Maintaining a stable blood sugar level

• Balanced pH in the blood

• Constant internal temperature

Multiple Choice

Which type of feedback mechanism amplifies the response of a system?

• Negative feedback

• Positive feedback

• Passive feedback

• Neutral feedback

Multiple Select

Which of the following are examples of negative feedback mechanisms in the human body?

• Blood sugar regulation

• Fruit ripening

• Human body temperature regulation

• Human child birth

Open Ended

Explain how negative feedback mechanisms help maintain homeostasis in the human body. Provide an example.

Fill in the Blanks

The cell membrane is selectively

, meaning it is picky about what goes in and out.

Multiple Choice

Which of the following statements about passive transport is correct?

• It requires extra energy from the cell.

• It moves molecules against the concentration gradient.

• It moves molecules down the concentration gradient.

• It only occurs in animal cells.

Open Ended

Compare and contrast passive and active transport in terms of energy requirement and direction of movement across the concentration gradient.

Multiple Choice

Which term describes the substance that gets dissolved in a solution?

• Solute

• Solvent

• Solution

• Concentration

Multiple Select

Which of the following statements about osmosis is/are correct?

• Water moves from an area of high concentration to low concentration.

• Osmosis involves the movement of solute molecules across the membrane.

• Equilibrium is reached when water concentration is equal on both sides of the membrane.

• Osmosis only occurs in plant cells.

Fill in the Blanks

Fill in the blank: In osmosis, water molecules move down a concentration gradient, from high ___ to an area of low ___.

Fill in the Blanks

Fill in the blank: In a hypotonic solution, the cell

due to the net movement of water into the cell.

Open Ended

Compare and contrast the effects of hypertonic, hypotonic, and isotonic solutions on a cell.

Multiple Choice

Which process allows a cell to concentrate key molecules within the cell or remove waste quickly from the cell?

• Active transport using molecular pumps

• Passive transport using diffusion

• Facilitated diffusion

• Osmosis

Open Ended

Why is homeostasis important for living organisms?

Fill in the Blanks

Facilitated diffusion helps regulate blood

.

Fill in the Blanks

A change in the environment that causes an organism to respond is called a

.

Open Ended

How does homeostasis help organisms maintain stability in their internal environment?