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Biology Quiz on Membrane Transport, created by cs423 on 13/10/2013.

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Membrane Transport

Question 1 of 31

1

The exchange of respiratory gases in a cell takes place through the:

Select one of the following:

  • lungs

  • vacuoles

  • stoma

  • cell membrane

Explanation

Question 2 of 31

1

cell membrane mostly consists of

Select one of the following:

  • carbohydrates and lipids

  • carbohydrates and nucleic acid

  • protein and carbohydrates

  • protein and lipids

Explanation

Question 3 of 31

1

in cells, the selectivity of the cell membrane is closely associated with the maintenance of:

Select one of the following:

  • homeostasis

  • plasmolysis

  • phagocytosis

  • pinocytosis

Explanation

Question 4 of 31

1

During which process do molecules move from a region of higher concentration to a region of lower concentration?

Select one of the following:

  • diffusion

  • active transport

  • cyclosis

  • circulation

Explanation

Question 5 of 31

1

Osmosis is a physical process most closely associated with the life function of:

Select one of the following:

  • absorption

  • respiration

  • locomotion

  • reproduction

Explanation

Question 6 of 31

1

Normally, the process of osmosis, the net flow of water molecules into or out of the cell depends on the difference in the:

Select one of the following:

  • concentration of water molecules inside and outside the cell

  • concentration of enzyme on either side of the cell membrane

  • rate of molecular motion on either side of the cell membrane

  • rate of movement of insoluble molecules inside the cell

Explanation

Question 7 of 31

1

If red blood cells are placed in distilled water, they will eventually be destroyed. Which process is most likely to be the chief cause of this destruction?

Select one of the following:

  • hydrolysis

  • dehydration synthesis

  • osomosis

  • plasmolysis

Explanation

Question 8 of 31

1

The destruction of all ATP (energy) molecules in a cell would interfere most immediately with the process of:

Select one of the following:

  • diffusion

  • gas exchange

  • osmosis

  • active transport

Explanation

Question 9 of 31

1

Active transport of certain proteins from a cell's environment into the cell is most closely associated with the:

Select one of the following:

  • cell membrane

  • cell wall

  • ribosome

  • nuclolus

Explanation

Question 10 of 31

1

Sodium ions are "pumped" from a region of lower concentration to a region of higher concentration in the nerve cells of humans. This process is an example of:

Select one of the following:

  • diffusion

  • passive transport

  • osmosis

  • active transport

Explanation

Question 11 of 31

1

during which process is ATP not essential?

Select one of the following:

  • active tranport

  • passive transport

  • phagocytosis

  • pinocytosis

Explanation

Question 12 of 31

1

The process of osmosis would explain the net movement of water into a cell if the percentage of:

Select one of the following:

  • water was 90% inside the cell and 95% outside the cell

  • water was 95% inside the cell and 90% outside the cell

  • protein was 30% inside the cell and 35% outside the cell

  • water and protein was equal inside and outside the cell

Explanation

Question 13 of 31

1

Freshwater protozoa may be distinguished from many marine protozoa by the fact that the freshwater species contain:

Select one of the following:

  • plasma membranes

  • contractile vacuoles

  • chromosomes

  • cytoplasm

Explanation

Question 14 of 31

1

An important role of the cell membrane is to:

Select one of the following:

  • store materials

  • change the rate of which chemical reactions occur

  • constructs proteins for the cells

  • maintain homeostasis

Explanation

Question 15 of 31

1

the cell membrane is said to be selectively permeable because it

Select one of the following:

  • is ultra thin and flexible

  • composed of lipids and proteins

  • allows only certain molecules to move through it

  • allows all molecules to pass through it, but only very slowly

Explanation

Question 16 of 31

1

what happens during diffusion?

Select one of the following:

  • molecules move automatically from an area of higher concentration to an area of lower concentration

  • molecules are pumped from an area of lower concentration to an area of higher concentration

  • an enzyme joins with a particular molecule

  • a catalyst speeds up the rate if a chemical reaction

Explanation

Question 17 of 31

1

during passive transport

Select one of the following:

  • the cell uses energy to move molecules across the cell membrane

  • molecules loves across the cell membrane without the use of energy

  • the cell uses energy to break chemical bonds

  • chemical bonds are broken without the use of energy

Explanation

Question 18 of 31

1

a plant cell shrinks when placed in salt water due to the movement of

Select one of the following:

  • salt molecules in the cell

  • water molecules out of the cell

  • salt molecules out of the cell

  • water molecules in the cell

Explanation

Question 19 of 31

1

a plant cell shrinks when placed in salt water due to the movement of

Select one of the following:

  • salt molecules in the cell

  • water molecules out of the cell

  • salt molecules out of the cell

  • water molecules in the cell

Explanation

Question 20 of 31

1

placing limp celery in water will make the celery stalk firm again due to

Select one of the following:

  • osmosis

  • active transport

  • gravity

  • a catalyst

Explanation

Question 21 of 31

1

the organelle that stores water for the cell is the

Select one of the following:

  • chloroplast

  • vacuole

  • lysosomes

  • golgi complex

Explanation

Question 22 of 31

1

a red blood cell placed in distilled (100%) water will swell and burst due to the diffusion of

Select one of the following:

  • salt out of the cell

  • salt into the cell

  • water out of the cell

  • water into the cell

Explanation

Question 23 of 31

1

some single-celled organisms live in fresh water (100% water) lakes. what problem do they encounter on a daily basis?

Select one of the following:

  • water is diffusing through their cell membrane and they may burst if it is not removed

  • water is diffusing out of their cell membrane and may shrivel up and die if water is not pumped back into the cell

  • both a and b

  • they do not encounter any problems living in the freshwater lake

Explanation

Question 24 of 31

1

human blood cells placed in a 2% salt solution appear to shrink, but those placed in a 0.4% salt solution burst. which statement best supports these observations?

Select one of the following:

  • salt causes cell walls to swell

  • salt is actively transported across the cell membranes

  • the nucelus does not regulate water balance in a cell

  • osmosis may be occur in either direction across the cell membrane

Explanation

Question 25 of 31

1

which process would include a net movement of sugar molecules through a membrane from a region of lower concentration to a region of higher concentration

Select one of the following:

  • osmosis

  • diffusion

  • passive transport

  • active transport

Explanation

Question 26 of 31

1

In the human body, potassium is small and can pass easily through the cell membrane. potassium is constantly diffusing out of the cell. however, there is always a higher concentration of potassium inside cells and a lower concentration outside of the cells. what process is responsible for maintaining this concentration gradient?

Select one of the following:

  • osmosis

  • diffusion

  • passive transport

  • active transport

Explanation

Question 27 of 31

1

when a cell uses energy to move materials across the cell membrane, the process is known as

Select one of the following:

  • osmosis

  • diffusion

  • passive transport

  • active transport

Explanation

Question 28 of 31

1

the net movement of molecules across the cell membrane is dependent upon the

Select one of the following:

  • selectivity of the cell membrane

  • selectivity of the cell wall

  • both a and b

  • neither a or b

Explanation

Question 29 of 31

1

a process that requires energy by cell and is used to engulf large macro-molecules is called

Select one of the following:

  • phagocytosis

  • endocytosis

  • exocytosis

  • both a and b

Explanation

Question 30 of 31

1

what happens during active transport

Select one of the following:

  • substances are moved from areas of high concentration to areas of low concentration with the use of energy

  • substances are moved from areas of low concentration to areas of high concentration without the use of energy

  • substances are moved from areas of high concentration to areas of low concentration without the use of energy

  • substances are moved from areas of low concentration to areas of high concentration with the use of energy

Explanation

Question 31 of 31

1

the sodium-potassium pump of a cell is located in

Select one of the following:

  • a protein molecule of the cell membrane

  • a lipid molecule of the cell membrane

  • an ATP molecule of the cell membrane

  • an ADP molecule of the cell membrane

  • in the cytoplasm

Explanation

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