Reference no: EM133228811

1. Because they are embedded within the membrane, ion channels are examples of ________.

a) receptor proteins

b) integral proteins

c) peripheral proteins

d) glycoproteins

2. Which of the following allows the movement of cytoplasm, ions, sugars, and amino acids from cell to cell?

a) Tight junctions

b) Gap junctions

c) Desmosomes

d) Cholesterol

3. In diffusion, substances move _____________ the concentration gradient, from regions of ________________ to ___________ concentration.

a) against, lower, higher

b) against, higher, lower

c) down, higher, lower

d) down, lower, higher

4. What is the function of the rough ER?

a) production of proteins

b) detoxification of certain substances

c) synthesis of steroid hormones

d) regulation of intracellular calcium concentration

5. Which of the following is a feature common to all three components of the cytoskeleton?

a) They all serve to scaffold the organelles within the cell.

b) They are all characterized by roughly the same diameter.

c) They are all polymers of protein subunits.

d) They all help the cell resist compression and tension.

6. Which of the following is a common characteristic for both the nucleus and mitochondria?

a) a double cell membrane

b) the synthesis of ribosomes

c) the production of cellular energy

d) the synthesis of proteins

7. Which of the following describes the function of membrane proteins?

a) Cell transport

b) Cell recognition

c) Cell signaling

d) All of the above

8. Which of the following provides the cell membrane with structure and stability?

a) Glycoproteins

b) Glycolipids

c) Peripheral proteins

d) Cholesterol