Q: Which equation best represents the energy requirement for primary active transport?

$$ \text{ATP} \rightarrow \text{ADP} + \text{P}_i + \text{energy} $$

Question 1

Which of the following best describes the main difference between primary and secondary active transport across the plasma membrane?

Accepted Answer

Primary active transport uses energy directly from ATP hydrolysis, while secondary active transport uses energy indirectly from ionic gradients created by primary active transport.

Question 2

A cell is observed to take in large solid particles by surrounding them with extensions of its plasma membrane, forming a vesicle. What is this process called?

Accepted Answer

Phagocytosis

Question 3

Which of the following is a correct statement about the Na$$^+-K$^+$$ pump?

Accepted Answer

It is an antiporter that pumps Na$$^+$$ out of the cell and K$$^+$$ into the cell against their concentration gradients.

Question 4

Which equation best represents the energy requirement for primary active transport?

Accepted Answer

$$ 	ext{ATP} ightarrow 	ext{ADP} + 	ext{P}_i + 	ext{energy} $$

Question 5

A patient is given a drug that blocks all ATP production in their cells. Which of the following transport processes would be most directly and immediately affected?

Accepted Answer

Primary active transport

Question 6

Which of the following best explains why the inside of a resting cell membrane is negative relative to the outside?

Accepted Answer

K$$^+$$ ions diffuse out of the cell through leakage channels, leaving behind negatively charged proteins that cannot cross the membrane.

Question 7

Which of the following is NOT a function of cell adhesion molecules (CAMs)?

Accepted Answer

Directly generating ATP for cellular processes

Question 8

A cell in the small intestine absorbs nutrients by engulfing extracellular fluid and dissolved solutes into tiny vesicles. Which process is this?

Accepted Answer

Pinocytosis

Question 9

Which of the following scenarios best illustrates secondary active transport?

Accepted Answer

Na$$^+$$ moving down its concentration gradient into the cell, dragging glucose with it via a symporter

Question 10

Which of the following is true about receptor-mediated endocytosis?

Accepted Answer

It involves the selective uptake of specific molecules bound to receptors in clathrin-coated pits.

Question 11

Which of the following best describes the role of G proteins in cell signaling?

Accepted Answer

They act as relays between extracellular messengers and intracellular second messengers, leading to cellular responses.

Question 12

A neuron is at rest with a membrane potential of $$-70\ 	ext{mV}. $$Which ion is primarily responsible for establishing this resting membrane potential?

Accepted Answer

K$$^+ ($$potassium)

Question 13

Which of the following best explains why the Na$$^+-K$^+$$ pump is essential for nerve and muscle function?

Accepted Answer

It maintains the electrochemical gradients of Na$$^+$$ and K$$^+$$, which are necessary for action potentials.

Question 14

Which of the following is an example of exocytosis in the human body?

Accepted Answer

Release of neurotransmitters from a neuron into the synaptic cleft

Question 15

A cell is exposed to a toxin that prevents the formation of vesicles. Which process would be most directly impaired?

Accepted Answer

Vesicular transport

Question 16

Which of the following best describes the function of antiporters in active transport?

Accepted Answer

They transport one substance into the cell while transporting a different substance out of the cell.

Question 17

Which of the following is a real-life example of receptor-mediated endocytosis that can have negative health consequences?

Accepted Answer

Viruses such as HIV hijacking cell receptors to enter host cells

Question 18

Which of the following best explains why the resting membrane potential is not exactly equal to the equilibrium potential for K$$^+$$?

Accepted Answer

The membrane is slightly permeable to Na$$^+$$, which brings the resting potential closer to zero.

Question 19

Which of the following best describes the process of transcytosis?

Accepted Answer

Transport of substances into, across, and then out of a cell via vesicles

Question 20

Which of the following is a correct statement about the voltage across a resting cell membrane?

Accepted Answer

It is typically negative inside the cell relative to the outside, with values ranging from $$-50 to$$ $$-100\ 	ext{mV}.$$

Active Membrane Transport and Cellular Physiology: Study Notes

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드