Membrane Transport at Universiti Putra Malaysia | Flashcards & Summaries

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Lernmaterialien für Membrane Transport an der Universiti Putra Malaysia

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TESTE DEIN WISSEN

What are the 4 characteristics of plasma membrane?

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1. selectively permitting - specific substances to pass between cell and environment

2. control the entry of nutrient molecules and exit of secretory and waste products

3. maintain the differences in ion concentrations between cell’s interior and exterior

4. key role in the ability of a cell to respond to changes, signals in cell’s environment

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TESTE DEIN WISSEN

Membrane transport are divided into 2. Give one characteristic that differentiate them& give 4 processes that involve in each transport.

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TESTE DEIN WISSEN

1. Passive (Physical) Processes
• require no cellular energy
• simple diffusion
• facilitated diffusion
• osmosis
• filtration


2. Active (Physiological) Processes
• require cellular energy
• active transport
• endocytosis
• exocytosis
• transcytosis

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TESTE DEIN WISSEN

Describe this terms:

a. Permeable

b. Impermeable

c. Selectively permeable

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TESTE DEIN WISSEN

a. Substances can cross the membrane
b. Substances cannot pass the membrane

c. Certain substances allowed to pass the membrane

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What is molecular motion?

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TESTE DEIN WISSEN

the inherent kinetic energy of molecules due to sub atomic forces and collisions
with other molecules lead to continuous random motion

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TESTE DEIN WISSEN

Between hypertonic, hypotonic and isotonic solution, which have a higher osmotic pressure?

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TESTE DEIN WISSEN

Hypertonic solution

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TESTE DEIN WISSEN

What are the 5 main factors that influence molecules moving across a cell membrane?

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TESTE DEIN WISSEN

– Size
– Lipid solubility
– Gradient size
– Temperature
– Distance to diffuse

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TESTE DEIN WISSEN

What are the examples of molecules that are highly lipid soluble?

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TESTE DEIN WISSEN

Uncharged or nonpolar molecules (O2, CO2, fatty acids)

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TESTE DEIN WISSEN

What are the examples of molecules that has low lipid solubility but very soluble in water?

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TESTE DEIN WISSEN

Charged particles (ions) and polar molecules (glucose, proteins)

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TESTE DEIN WISSEN

Movement across the membrane also mediate by force. What are the 2 general types of forces involved in accomplishing transport across the membrane?

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TESTE DEIN WISSEN

1. Passive forces - forces that do not require the cell to extend energy to produce movement
2. Active forces - forces that do require the cell to extend energy (ATP) to transport substances across the membrane

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TESTE DEIN WISSEN

What is diffusion?

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TESTE DEIN WISSEN

the passive movement of molecules or particles along a concentration gradient or from regions of higher to lower concentration

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TESTE DEIN WISSEN

What are the 2 characteristics of the channel& carrier mediated facilitated diffusion? Explain

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TESTE DEIN WISSEN

1. Specific - to size, charge & interaction with the channel

2. Subject to saturation - making the channels rate limited

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TESTE DEIN WISSEN

What are the 3 examples of molecules that need assisted membrane transport to cross the plasma membrane? And why?

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TESTE DEIN WISSEN

- Glucose (energy), proteins. amino acids (protein synthesis)

- These molecules are too big for channels and they cannot dissolve in the lipid bilayer

- Therefore, they need a transport to transporting these molecules in or out of the cells

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Q:

What are the 4 characteristics of plasma membrane?

A:

1. selectively permitting - specific substances to pass between cell and environment

2. control the entry of nutrient molecules and exit of secretory and waste products

3. maintain the differences in ion concentrations between cell’s interior and exterior

4. key role in the ability of a cell to respond to changes, signals in cell’s environment

Q:

Membrane transport are divided into 2. Give one characteristic that differentiate them& give 4 processes that involve in each transport.

A:

1. Passive (Physical) Processes
• require no cellular energy
• simple diffusion
• facilitated diffusion
• osmosis
• filtration


2. Active (Physiological) Processes
• require cellular energy
• active transport
• endocytosis
• exocytosis
• transcytosis

Q:

Describe this terms:

a. Permeable

b. Impermeable

c. Selectively permeable

A:

a. Substances can cross the membrane
b. Substances cannot pass the membrane

c. Certain substances allowed to pass the membrane

Q:

What is molecular motion?

A:

the inherent kinetic energy of molecules due to sub atomic forces and collisions
with other molecules lead to continuous random motion

Q:

Between hypertonic, hypotonic and isotonic solution, which have a higher osmotic pressure?

A:

Hypertonic solution

Mehr Karteikarten anzeigen
Q:

What are the 5 main factors that influence molecules moving across a cell membrane?

A:

– Size
– Lipid solubility
– Gradient size
– Temperature
– Distance to diffuse

Q:

What are the examples of molecules that are highly lipid soluble?

A:

Uncharged or nonpolar molecules (O2, CO2, fatty acids)

Q:

What are the examples of molecules that has low lipid solubility but very soluble in water?

A:

Charged particles (ions) and polar molecules (glucose, proteins)

Q:

Movement across the membrane also mediate by force. What are the 2 general types of forces involved in accomplishing transport across the membrane?

A:

1. Passive forces - forces that do not require the cell to extend energy to produce movement
2. Active forces - forces that do require the cell to extend energy (ATP) to transport substances across the membrane

Q:

What is diffusion?

A:

the passive movement of molecules or particles along a concentration gradient or from regions of higher to lower concentration

Q:

What are the 2 characteristics of the channel& carrier mediated facilitated diffusion? Explain

A:

1. Specific - to size, charge & interaction with the channel

2. Subject to saturation - making the channels rate limited

Q:

What are the 3 examples of molecules that need assisted membrane transport to cross the plasma membrane? And why?

A:

- Glucose (energy), proteins. amino acids (protein synthesis)

- These molecules are too big for channels and they cannot dissolve in the lipid bilayer

- Therefore, they need a transport to transporting these molecules in or out of the cells

Membrane Transport

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