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

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Chapter 15

Question 1 of 26

1

The Na+/K+ pump is:

Select one of the following:

  • a) cytosolic enzyme;

  • b) membrane protein with enzyme activity;

  • c) membrane lipid.

Explanation

Question 2 of 26

1

The Na+/K+ pump is found:

Select one of the following:

  • a) in all types of cells;

  • b) in the excitable cells only;

  • c) in the human excitable cells.

Explanation

Question 3 of 26

1

The Na+/K+ pump is a type of:

Select one of the following:

  • a) passive ion transporter;

  • b) facilitated ion channel;

  • c) active ion transporter.

Explanation

Question 4 of 26

1

Does the Na+/K+ pump require an energy source?

Select one of the following:

  • 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.

Explanation

Question 5 of 26

1

What are the operation modes of the Na+/K+ pump?

Select one of the following:

  • a) electrogenic and non-electrogenic;

  • b) transmembrane and intracellular;

  • c) passive and active.

Explanation

Question 6 of 26

1

Describe the directions of ion transport through the Na+/K+ pump:

Select one of the following:

  • a) moves Na+ and K+ ions out of the cell;

  • b) moves Na+ out, and K+ in;

  • c) moves Na+ in, and K+ out.

Explanation

Question 7 of 26

1

. The Na+/K+ pump is found in:

Select one of the following:

  • a) cellular membranes;

  • b) cellular membrane and the membrane of the endoplasm reticulum;

  • c) nuclear and cellular membranes.

Explanation

Question 8 of 26

1

Which of the following transport processes is considered an active transport?

Select one of the following:

  • 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;

Explanation

Question 9 of 26

1

According the type of energy supply, the active membrane transport is divided into:

Select one of the following:

  • a) primary and secondary;

  • b) simport and antiport;

  • c) active and passive.

Explanation

Question 10 of 26

1

Which of the following statements does not hold for primary active transport?

Select one of the following:

  • transmembrane transport of inorganic ions;

  • transmembrane transport of organic molecules;

  • uses energy from ATP.

Explanation

Question 11 of 26

1

In the electrogenic regime the sodium – potassiumpump:

Select one of the following:

  • 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.

Explanation

Question 12 of 26

1

Which of the following statements refer to the primary active transmembrane transport?

Select one of the following:

  • 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.

Explanation

Question 13 of 26

1

The secondary active transport is carried through:

Select one of the following:

  • a) membrane protein carriers;

  • b) transmembrane ion channels;

  • c) spontaneously formed (and vanishing) membrane pores.

Explanation

Question 14 of 26

1

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?

Select one of the following:

  • 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.

Explanation

Question 15 of 26

1

What type of membrane transport delivers iodide into the thyroid gland?
a) passive transport;

Select one of the following:

  • a) passive transport;

  • b) primary active transport;

  • c) secondary active transport.

Explanation

Question 16 of 26

1

What is the direct driving force for the transmembrane transport of iodide?

Select one of the following:

  • a) energy from the hydrolysis of ATP;

  • b) the electrochemical gradient of Na+ ions;

  • c) the concentration gradient of Na+ ions.

Explanation

Question 17 of 26

1

Antiport is defined as:

Select one of the following:

  • 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.

Explanation

Question 18 of 26

1

The operational mode of the thyroid Na+/I- symporter is as follows:

Select one of the following:

  • 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.

Explanation

Question 19 of 26

1

An example for secondary active transport is:

Select one of the following:

  • a) the Ca2+ pump;

  • b) the Na+/I- symporter;

  • c) the K+ leak channel.

Explanation

Question 20 of 26

1

The electrogenic mode of operation of the Na+/K+ pump is as follows:

Select one of the following:

  • 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;

Explanation

Question 21 of 26

1

Transmembrane transport of substances against their electrochemical gradient, that does not use direct coupling of ATP is called:

Select one of the following:

  • a) passive transport;

  • b) primary active transport;

  • c) secondary active transport.

Explanation

Question 22 of 26

1

When substances are transported across the membrane through specialised protein molecules, the process is described as:

Select one of the following:

  • a) simple diffusion;

  • b) uniport or cotransport;

  • c) protein transport.

Explanation

Question 23 of 26

1

When substances use protein carrier molecules to cross the membrane, the process is described as:

Select one of the following:

  • a) simple diffusion;

  • b) protein-lipid transport;

  • c) facilitated diffusion.

Explanation

Question 24 of 26

1

What type of membrane transport involves the accumulation of iodine in the follicular cells of the thyroid gland?

Select one of the following:

  • b) secondary-active;

  • c) facilitated passive.

  • a) primary-active;

Explanation

Question 25 of 26

1

The primary active membrane transport is carried by:

Select one of the following:

  • a) aquaporins;

  • b) ion channels;

  • c) ion pumps.

Explanation

Question 26 of 26

1

The bi-directional secondary active transport is called:

Select one of the following:

  • a) simport;

  • b) antiport;

  • c) uniport.

Explanation

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