1. Which of the following is a component of passive transport? A. requires ATP B

ID: 3474459 • Letter: 1

Question

1. Which of the following is a component of passive transport?

A. requires ATP

B. can occur with or without a carrier molecule

C. allows all molecules and ions to pass hrough the cell membrane

D. movement up a concentration gradient

2. How does passive transport differ from active transport?

A. active requires use of ATP, passive does not

B. active goes against a concentration gradient, passive goes with the gradient

C. active must use a carrier molecule, passive occure wiht or without a carrier

D. all of the choices are differences between active and passive transportation.

3. A student has had a bad case of upset stomach with fever, vomiting, and diarrhea for several days and ends up in the emergency room. What type of IV solution should be given to the student?

A. isotonic

B. hypertonic

C. hypotonic

4. A slice of potato is placed in a hypertonic salt water solution. In a few hours, what would be the appearance of the potato slice?

A. It would be shriveled

B. it would be "puffy"

C. There would be no change

D. The cells would have burst

5. What does the hydrolysis of ATP do in a Ca2+ pump or a Na+/K+ pump?

A. return the carrier to its initial shape

B. allows the ion to bind ro the inside of the carrier

C. activates ATPase

D. temporarily blocks both exits of the carrier

6. Which of the following is a function of the gradient created by the NA+/k+ PUMP?

A. maintains higher levels of potassium (K+) ions outside the cell

B. does not require energy

C. provides for fascilitated diffusion

D, produces electrochemical impulses in muscles and nerves

7. If a plasma membrane was only permeable to calcium ions, theresting membrane potential would be:

A. equal to the equillibrium potential for CA2+

B. zero, since the membrane is at rest

C. equal to the equilibrium potential, but opposite in carge

D. greater than the equilibrium potential

8. If a regulatory molecule is nonpolar, the receptor proteein would most likely be found:

A. on the outside of the plasma membrane

B. on the inside of the plasma membrane

C. in the cytoplasm

D. All of the choices are possible

9. A polar regulatory molecule will require a _______ to cause changes in the cell.

A. nuclear receptor

B. cytoplasmic receptor

C. second messenger

D. calcium ion

10. When sugar is mixed with water, equilibrium is reached when_______.

A. molecules stop moving

B. water and sugar molecules are moving at the same speed

C. the dissolved sugar molecules are evenly distributed throughout the solution

D. there are the same number of water molecules as dissolved sugar molecules

E. two tablespoons of coffee are added

11. Lethal injections trigger the cessation of the heartbeat as a result of:

A. lower equilibrium potential for potassium

B. lower equilibrium potential for sodium

C. more negative resting membrane potential than normal

D. greater concentrations of ions both inside and outside of the cells

12. If an oral rehydration therapy (ORT) solution has an unequal concentration of NaCl and glucose, this can cause which of the following to occur?

A. ineffective cotransport

B. increased rate of osmosis

C. increased intestinal absorption of water

D. improved hydration over IV therapy

Explanation / Answer