What I Need to Know About Nucleic Acids, Osmosis and Diffusion, and Homeostasis

What I need to know about Cell Transport: Osmosis and Diffusion

. Diffusion

Circle the correct bolded words.

Diffusion is the movement of a substance/water across a selectively permeable membrane from an area of high/low concentration to high/low concentration.

Diffusion of substances

Identify 3 substances that move across the cell membrane.

1. ______

2. ______

3. ______Draw a picture demonstrating diffusion across the cell membrane – show high and low concentrations and indicate in which direction the molecules are moving (into or out of the cell)

What is the role of diffusion in our lung cells? ______

Effect of temperature on the Rate of Diffusion Lab Set Up Temperature Time to Dissolve A – Cold 20 1 minute B – Room 40 30 seconds C – Warm 60 12 seconds D - Hot 80 4 seconds

Using the data table above, please identify: Independent Variable: ______Dependent Variable: ______Constants: ______Control Group: ______

In which temperature would the rate of diffusion be quickest? a. Hot b. Warm c. Room d. Cold

Explain why: ______Match the definition to the correct term.

Term Definition a. This type of transport requires energy for it _____1. Passive transport to happen. b. Molecules on both sides of the cell _____ 2. Active transport membrane are equal. c. The difference in concentration of _____ 3. Equilibrium molecules. d. movement of a substance or water without _____ 4. Concentration gradient energy. Osmosis

Circle the correct bolded words.

Osmosis is the movement of a substance/water across a selectively permeable membrane from an area of high/low concentration to high/low concentration.

Explain why the water molecules are moving from inside the cell to the outside of the cell.

______Carrot Osmosis Lab Type of Initial Weight Final Weight Solution

Using the data table above, please identify: Independent Variable: ______Dependent Variable: ______Constants: ______

In which type of solution does the carrot increase in size? a. Distilled Water b. Salt Water

Explain why: ______

Explain what will happen for each type of solution (picture and words). A cell which normally lives in a 30% saltwater solution was moved into another solution. What will happen if the cell is placed in a:

A. 0% saltwater solution

B. 10% saltwater solution

C.20% saltwater solution

D. 30% saltwater solution

Which of the solutions above would cause the cell to increase in size the most? Why? ______

The Structure of the Cell Membrane Draw cell membrane and Label the following: phospholipid bilayer, phospholipid, polar head, non-polar tail, protein, inside of cell, outside of cell

Cell Membrane Function What is the role of the cell membrane? Give an example of the function in a real cell. ______What does selectively permeable mean? ______