Exam 1, Cell Structure &Function (Ch.3)

7. The diffusion of substances within a solution tends to move those substances ________ their ________ gradient. up; electrical up; electrochemical down; pressure down; concentration

down; concentration

30. What materials can easily diffuse through the lipid bilayer, and why?

The structure of the lipid bilayer allows small, uncharged substances such as oxygen and carbon dioxide, and hydrophobic molecules such as lipids, to pass through the cell membrane, down their concentration gradient, by simple diffusion

13. Which of the following is a feature common to all three components of the cytoskeleton? They all serve to scaffold the organelles within the cell. They are all characterized by roughly the same diameter. They are all polymers of protein subunits. They all help the cell resist compression and tension.

They are all polymers of protein subunits.

!!!Check Again, Might not be correct !!! 32. What do osmosis, diffusion, filtration, and the movement of ions away from like charge all have in common? In what way do they differ?

They're all passive transport, move from high to low concentration gradient, and occur in plants and animals. They are different in that they move different things (osmosis-water, diffusion-molecules, etc...).

8. Ion pumps and phagocytosis are both examples of ________. endocytosis passive transport active transport facilitated diffusion

active transport

6. Because they are embedded within the membrane, ion channels are examples of ________. receptor proteins integral proteins peripheral proteins glycoproteins

integral proteins

14. Which of the following organelles produces large quantities of ATP when both glucose and oxygen are available to the cell? mitochondria peroxisomes lysosomes ER

mitochondria

9. Choose the answer that best completes the following analogy: Diffusion is to ________ as endocytosis is to ________. filtration; phagocytosis osmosis; pinocytosis solutes; fluid gradient; chemical energy

osmosis; pinocytosis

12. Which of the following is a function of the rough ER? production of proteins detoxification of certain substances synthesis of steroid hormones regulation of intracellular calcium concentration

production of proteins

10. Choose the term that best completes the following analogy: Cytoplasm is to cytosol as a swimming pool containing chlorine and flotation toys is to ________. the walls of the pool the chlorine the flotation toys the water

the water