Chapter 15

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Quiz on Chapter 15, created by x x on 06/29/2019.

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Question 1

Question
The Na+/K+ pump is:
Answer
  • a) cytosolic enzyme;
  • b) membrane protein with enzyme activity;
  • c) membrane lipid.

Question 2

Question
The Na+/K+ pump is found:
Answer
  • a) in all types of cells;
  • b) in the excitable cells only;
  • c) in the human excitable cells.

Question 3

Question
The Na+/K+ pump is a type of:
Answer
  • a) passive ion transporter;
  • b) facilitated ion channel;
  • c) active ion transporter.

Question 4

Question
Does the Na+/K+ pump require an energy source?
Answer
  • a) yes, it hydrolyses adenosine triphosphate;
  • b) no, ions are driven by concentration gradients;
  • c) yes, it uses redox reactions in the annular lipid molecules.

Question 5

Question
What are the operation modes of the Na+/K+ pump?
Answer
  • a) electrogenic and non-electrogenic;
  • b) transmembrane and intracellular;
  • c) passive and active.

Question 6

Question
Describe the directions of ion transport through the Na+/K+ pump:
Answer
  • a) moves Na+ and K+ ions out of the cell;
  • b) moves Na+ out, and K+ in;
  • c) moves Na+ in, and K+ out.

Question 7

Question
. The Na+/K+ pump is found in:
Answer
  • a) cellular membranes;
  • b) cellular membrane and the membrane of the endoplasm reticulum;
  • c) nuclear and cellular membranes.

Question 8

Question
Which of the following transport processes is considered an active transport?
Answer
  • a) the transfer of substance (molecules, ions) from area with high concentration into area of lower concentration;
  • b) the transfer of substance (molecules, ions) irregardless of the direction of the concentration gradient;
  • c) the transfer of substance (molecules, ions) from area with low concentration into area of higher concentration;

Question 9

Question
According the type of energy supply, the active membrane transport is divided into:
Answer
  • a) primary and secondary;
  • b) simport and antiport;
  • c) active and passive.

Question 10

Question
Which of the following statements does not hold for primary active transport?
Answer
  • transmembrane transport of inorganic ions;
  • transmembrane transport of organic molecules;
  • uses energy from ATP.

Question 11

Question
In the electrogenic regime the sodium – potassiumpump:
Answer
  • a) moves one negative charge out of the cell;
  • b) moves one positive charge out of the cell;
  • c) moves three positive charges in, for two positive charges out.

Question 12

Question
Which of the following statements refer to the primary active transmembrane transport?
Answer
  • a) transport of organic molecules;
  • b) uses the energy of the concentration gradient of Na+;
  • c) involves the active transport of: Na+, K+, Ca2+, H+, Mg2+, Cl-, and bicarbonate ions.

Question 13

Question
The secondary active transport is carried through:
Answer
  • a) membrane protein carriers;
  • b) transmembrane ion channels;
  • c) spontaneously formed (and vanishing) membrane pores.

Question 14

Question
The Na+/I- symporter, which transports iodine into the thyroid gland, cannot distinguish between non-radioactive (I-127) and radioactive (I-131) iodine. How could this be explained?
Answer
  • a) radioactive and non-radioactive iodine have the same physical properties;
  • b) radioactive and non-radioactive iodine have the same number of neutrons;
  • c) radioactive and non-radioactive iodine have the same chemical properties.

Question 15

Question
What type of membrane transport delivers iodide into the thyroid gland? a) passive transport;
Answer
  • a) passive transport;
  • b) primary active transport;
  • c) secondary active transport.

Question 16

Question
What is the direct driving force for the transmembrane transport of iodide?
Answer
  • a) energy from the hydrolysis of ATP;
  • b) the electrochemical gradient of Na+ ions;
  • c) the concentration gradient of Na+ ions.

Question 17

Question
Antiport is defined as:
Answer
  • a) coupled membrane transport, where substances move in the same direction;
  • b) coupled membrane transport, where substances move in opposite directions;
  • c) ion channel that allows ions to move only in one direction.

Question 18

Question
The operational mode of the thyroid Na+/I- symporter is as follows:
Answer
  • a) 2 Na+ ions move in, for each I- ion moving in;
  • b) 2 Na+ ions move out, for each I- ion moving in;
  • c) 3 Na+ ions move in, for 2 I- ions moving out.

Question 19

Question
An example for secondary active transport is:
Answer
  • a) the Ca2+ pump;
  • b) the Na+/I- symporter;
  • c) the K+ leak channel.

Question 20

Question
The electrogenic mode of operation of the Na+/K+ pump is as follows:
Answer
  • a) 2 Na+ ions move out, for 3 K+ ions moving in;
  • b) 3 Na+ ions move out, for 2 K+ ions moving in;
  • c) 3 Na+ ions move in, for 2 K+ moving out;

Question 21

Question
Transmembrane transport of substances against their electrochemical gradient, that does not use direct coupling of ATP is called:
Answer
  • a) passive transport;
  • b) primary active transport;
  • c) secondary active transport.

Question 22

Question
When substances are transported across the membrane through specialised protein molecules, the process is described as:
Answer
  • a) simple diffusion;
  • b) uniport or cotransport;
  • c) protein transport.

Question 23

Question
When substances use protein carrier molecules to cross the membrane, the process is described as:
Answer
  • a) simple diffusion;
  • b) protein-lipid transport;
  • c) facilitated diffusion.

Question 24

Question
What type of membrane transport involves the accumulation of iodine in the follicular cells of the thyroid gland?
Answer
  • b) secondary-active;
  • c) facilitated passive.
  • a) primary-active;

Question 25

Question
The primary active membrane transport is carried by:
Answer
  • a) aquaporins;
  • b) ion channels;
  • c) ion pumps.

Question 26

Question
The bi-directional secondary active transport is called:
Answer
  • a) simport;
  • b) antiport;
  • c) uniport.
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