Plz help biology homework?

Posted on 2015-09-28 06:38:00 in Biology by ALEX

1. Which of the following type of activity is defective in a person with cystic fibrosis?
a.enzymatic activity
b. cells being able to recognize one another
c. transporting ions across a membrane
d. receptors embedded in a cell membrane
e.all the above

2. A Glucose molecule would move across a plasma membrane by which process?
a. active transport
b. All membranes are impermeable to glucose
c. Facilitated diffusion
d. Simple diffusion
e. Diffusion

3. Osmosis is the diffusion of _____________.
a. water
b. salt
c. solute
d. glucose only
e. a semi permeable membrane

4. Receptors in the plasma membrane
a. act as enzymes
b. Are important for cells during early development and in immunity
c. Help material move in and out of the cell
d. Provide support and shape to the cell
e. Act as an attachment site for substances that interact with the cell

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