cs423
Quiz von , erstellt am more than 1 year ago

Biology Quiz am Membrane Transport, erstellt von cs423 am 13/10/2013.

73
2
0
cs423
Erstellt von cs423 vor fast 11 Jahre
Schließen

Membrane Transport

Frage 1 von 31

1

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

Wähle eine der folgenden:

  • lungs

  • vacuoles

  • stoma

  • cell membrane

Erklärung

Frage 2 von 31

1

cell membrane mostly consists of

Wähle eine der folgenden:

  • carbohydrates and lipids

  • carbohydrates and nucleic acid

  • protein and carbohydrates

  • protein and lipids

Erklärung

Frage 3 von 31

1

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

Wähle eine der folgenden:

  • homeostasis

  • plasmolysis

  • phagocytosis

  • pinocytosis

Erklärung

Frage 4 von 31

1

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

Wähle eine der folgenden:

  • diffusion

  • active transport

  • cyclosis

  • circulation

Erklärung

Frage 5 von 31

1

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

Wähle eine der folgenden:

  • absorption

  • respiration

  • locomotion

  • reproduction

Erklärung

Frage 6 von 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:

Wähle eine der folgenden:

  • 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

Erklärung

Frage 7 von 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?

Wähle eine der folgenden:

  • hydrolysis

  • dehydration synthesis

  • osomosis

  • plasmolysis

Erklärung

Frage 8 von 31

1

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

Wähle eine der folgenden:

  • diffusion

  • gas exchange

  • osmosis

  • active transport

Erklärung

Frage 9 von 31

1

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

Wähle eine der folgenden:

  • cell membrane

  • cell wall

  • ribosome

  • nuclolus

Erklärung

Frage 10 von 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:

Wähle eine der folgenden:

  • diffusion

  • passive transport

  • osmosis

  • active transport

Erklärung

Frage 11 von 31

1

during which process is ATP not essential?

Wähle eine der folgenden:

  • active tranport

  • passive transport

  • phagocytosis

  • pinocytosis

Erklärung

Frage 12 von 31

1

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

Wähle eine der folgenden:

  • 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

Erklärung

Frage 13 von 31

1

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

Wähle eine der folgenden:

  • plasma membranes

  • contractile vacuoles

  • chromosomes

  • cytoplasm

Erklärung

Frage 14 von 31

1

An important role of the cell membrane is to:

Wähle eine der folgenden:

  • store materials

  • change the rate of which chemical reactions occur

  • constructs proteins for the cells

  • maintain homeostasis

Erklärung

Frage 15 von 31

1

the cell membrane is said to be selectively permeable because it

Wähle eine der folgenden:

  • 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

Erklärung

Frage 16 von 31

1

what happens during diffusion?

Wähle eine der folgenden:

  • 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

Erklärung

Frage 17 von 31

1

during passive transport

Wähle eine der folgenden:

  • 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

Erklärung

Frage 18 von 31

1

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

Wähle eine der folgenden:

  • salt molecules in the cell

  • water molecules out of the cell

  • salt molecules out of the cell

  • water molecules in the cell

Erklärung

Frage 19 von 31

1

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

Wähle eine der folgenden:

  • salt molecules in the cell

  • water molecules out of the cell

  • salt molecules out of the cell

  • water molecules in the cell

Erklärung

Frage 20 von 31

1

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

Wähle eine der folgenden:

  • osmosis

  • active transport

  • gravity

  • a catalyst

Erklärung

Frage 21 von 31

1

the organelle that stores water for the cell is the

Wähle eine der folgenden:

  • chloroplast

  • vacuole

  • lysosomes

  • golgi complex

Erklärung

Frage 22 von 31

1

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

Wähle eine der folgenden:

  • salt out of the cell

  • salt into the cell

  • water out of the cell

  • water into the cell

Erklärung

Frage 23 von 31

1

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

Wähle eine der folgenden:

  • 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

Erklärung

Frage 24 von 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?

Wähle eine der folgenden:

  • 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

Erklärung

Frage 25 von 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

Wähle eine der folgenden:

  • osmosis

  • diffusion

  • passive transport

  • active transport

Erklärung

Frage 26 von 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?

Wähle eine der folgenden:

  • osmosis

  • diffusion

  • passive transport

  • active transport

Erklärung

Frage 27 von 31

1

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

Wähle eine der folgenden:

  • osmosis

  • diffusion

  • passive transport

  • active transport

Erklärung

Frage 28 von 31

1

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

Wähle eine der folgenden:

  • selectivity of the cell membrane

  • selectivity of the cell wall

  • both a and b

  • neither a or b

Erklärung

Frage 29 von 31

1

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

Wähle eine der folgenden:

  • phagocytosis

  • endocytosis

  • exocytosis

  • both a and b

Erklärung

Frage 30 von 31

1

what happens during active transport

Wähle eine der folgenden:

  • 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

Erklärung

Frage 31 von 31

1

the sodium-potassium pump of a cell is located in

Wähle eine der folgenden:

  • 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

Erklärung