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Biology Test sobre Membrane Transport, creado por cs423 el 13/10/2013.

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Membrane Transport

Pregunta 1 de 31

1

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

Selecciona una de las siguientes respuestas posibles:

  • lungs

  • vacuoles

  • stoma

  • cell membrane

Explicación

Pregunta 2 de 31

1

cell membrane mostly consists of

Selecciona una de las siguientes respuestas posibles:

  • carbohydrates and lipids

  • carbohydrates and nucleic acid

  • protein and carbohydrates

  • protein and lipids

Explicación

Pregunta 3 de 31

1

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

Selecciona una de las siguientes respuestas posibles:

  • homeostasis

  • plasmolysis

  • phagocytosis

  • pinocytosis

Explicación

Pregunta 4 de 31

1

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

Selecciona una de las siguientes respuestas posibles:

  • diffusion

  • active transport

  • cyclosis

  • circulation

Explicación

Pregunta 5 de 31

1

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

Selecciona una de las siguientes respuestas posibles:

  • absorption

  • respiration

  • locomotion

  • reproduction

Explicación

Pregunta 6 de 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:

Selecciona una de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 7 de 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?

Selecciona una de las siguientes respuestas posibles:

  • hydrolysis

  • dehydration synthesis

  • osomosis

  • plasmolysis

Explicación

Pregunta 8 de 31

1

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

Selecciona una de las siguientes respuestas posibles:

  • diffusion

  • gas exchange

  • osmosis

  • active transport

Explicación

Pregunta 9 de 31

1

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

Selecciona una de las siguientes respuestas posibles:

  • cell membrane

  • cell wall

  • ribosome

  • nuclolus

Explicación

Pregunta 10 de 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:

Selecciona una de las siguientes respuestas posibles:

  • diffusion

  • passive transport

  • osmosis

  • active transport

Explicación

Pregunta 11 de 31

1

during which process is ATP not essential?

Selecciona una de las siguientes respuestas posibles:

  • active tranport

  • passive transport

  • phagocytosis

  • pinocytosis

Explicación

Pregunta 12 de 31

1

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

Selecciona una de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 13 de 31

1

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

Selecciona una de las siguientes respuestas posibles:

  • plasma membranes

  • contractile vacuoles

  • chromosomes

  • cytoplasm

Explicación

Pregunta 14 de 31

1

An important role of the cell membrane is to:

Selecciona una de las siguientes respuestas posibles:

  • store materials

  • change the rate of which chemical reactions occur

  • constructs proteins for the cells

  • maintain homeostasis

Explicación

Pregunta 15 de 31

1

the cell membrane is said to be selectively permeable because it

Selecciona una de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 16 de 31

1

what happens during diffusion?

Selecciona una de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 17 de 31

1

during passive transport

Selecciona una de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 18 de 31

1

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

Selecciona una de las siguientes respuestas posibles:

  • salt molecules in the cell

  • water molecules out of the cell

  • salt molecules out of the cell

  • water molecules in the cell

Explicación

Pregunta 19 de 31

1

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

Selecciona una de las siguientes respuestas posibles:

  • salt molecules in the cell

  • water molecules out of the cell

  • salt molecules out of the cell

  • water molecules in the cell

Explicación

Pregunta 20 de 31

1

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

Selecciona una de las siguientes respuestas posibles:

  • osmosis

  • active transport

  • gravity

  • a catalyst

Explicación

Pregunta 21 de 31

1

the organelle that stores water for the cell is the

Selecciona una de las siguientes respuestas posibles:

  • chloroplast

  • vacuole

  • lysosomes

  • golgi complex

Explicación

Pregunta 22 de 31

1

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

Selecciona una de las siguientes respuestas posibles:

  • salt out of the cell

  • salt into the cell

  • water out of the cell

  • water into the cell

Explicación

Pregunta 23 de 31

1

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

Selecciona una de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 24 de 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?

Selecciona una de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 25 de 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

Selecciona una de las siguientes respuestas posibles:

  • osmosis

  • diffusion

  • passive transport

  • active transport

Explicación

Pregunta 26 de 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?

Selecciona una de las siguientes respuestas posibles:

  • osmosis

  • diffusion

  • passive transport

  • active transport

Explicación

Pregunta 27 de 31

1

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

Selecciona una de las siguientes respuestas posibles:

  • osmosis

  • diffusion

  • passive transport

  • active transport

Explicación

Pregunta 28 de 31

1

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

Selecciona una de las siguientes respuestas posibles:

  • selectivity of the cell membrane

  • selectivity of the cell wall

  • both a and b

  • neither a or b

Explicación

Pregunta 29 de 31

1

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

Selecciona una de las siguientes respuestas posibles:

  • phagocytosis

  • endocytosis

  • exocytosis

  • both a and b

Explicación

Pregunta 30 de 31

1

what happens during active transport

Selecciona una de las siguientes respuestas posibles:

  • 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

Explicación

Pregunta 31 de 31

1

the sodium-potassium pump of a cell is located in

Selecciona una de las siguientes respuestas posibles:

  • 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

Explicación

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