In facilitated diffusion do molecules move down concentration gradient?

In facilitated diffusion do molecules move down concentration gradient?
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Without saturation of transport proteins and under same concentration gradient how can the speed of simple diffusion be compared to the speed of facilitated diffusion ?

Description : Without saturation of transport proteins and under same concentration gradient how can the speed of simple diffusion be compared to the speed of facilitated diffusion ?

Last Answer : The action of facilitator proteins in facilitated diffusion makes this type of diffusion faster than simple diffusion under equal concentration gradients of the moved substance.

Substances insoluble in a membrane are carried across the membrane with the concentration gradient by means of a carrier molecule in a process known as: a) osmosis. b) diffusion. c) active transport. d) facilitated diffusion.

Description : Substances insoluble in a membrane are carried across the membrane with the concentration gradient by means of a carrier molecule in a process known as: a) osmosis. b) diffusion. c) active transport. d) facilitated diffusion.

Last Answer : ANSWER: D -- FACILITATED DIFFUSION.

The primary force moving water molecules from the blood plasma to the interstitial fluid is a. active transport b. cotransport with H+ c. facilitated diffusion d. cotransport with Na+ e. filtration

Description : The primary force moving water molecules from the blood plasma to the interstitial fluid is a. active transport b. cotransport with H+ c. facilitated diffusion d. cotransport with Na+ e. filtration

Last Answer : filtration

How does the intensity of facilitated diffusion vary in relation to the concentration of the moved substance ?

Description : How does the intensity of facilitated diffusion vary in relation to the concentration of the moved substance ?

Last Answer : What is the limiting factor? Likewise simple diffusion facilitated diffusion is more intense when the concentration gradient of the substance increases and less intense when the gradient lessens. In ... which the maximum transport capacity of the substance across the membrane is achieved.

How does the intensity of simple diffusion vary in relation to the concentration gradient of the moved substance ?

Description : How does the intensity of simple diffusion vary in relation to the concentration gradient of the moved substance ?

Last Answer : The higher the concentration gradient of a substance the more intense its simple diffusion will be. If the concentration gradient diminishes the intensity of simple diffusion diminishes too.

Pick out the wrong statement. (A) The Reynolds analogy for mass transfer is given by Lewis relation and is applicable, when Schmidt number is one (B) Sherwood number for flow in pipes can be expressed as the ratio of the concentration gradient at wall to the overall concentration difference (C) According to film theory for equimolar counter diffusion, the mass transfer coefficient is given by DAB(B)P - 3, Q - 2 (D) The z-component of the total mass flux of a component A in binary mixture of A and B is given by - Dab'.dCA/dz

Description : Pick out the wrong statement. (A) The Reynolds analogy for mass transfer is given by Lewis relation and is applicable, when Schmidt number is one (B) Sherwood number for flow in pipes can be expressed ... flux of a component A in binary mixture of A and B is given by - Dab'.dCA/dz

Last Answer : (C) According to film theory for equimolar counter diffusion, the mass transfer coefficient is given by DAB(B)P - 3, Q - 2

The movement of ions against the concentration gradient will be (a) active transport (b) osmosis (c) diffusion (d) all of the above.

Description : The movement of ions against the concentration gradient will be (a) active transport (b) osmosis (c) diffusion (d) all of the above.

Last Answer : (a) active transport

Molecular diffusion is caused by the (A) Transfer of molecules from low concentration to high concentration region (B) Thermal energy of the molecules (C) Activation energy of the molecules (D) Potential energy of the molecules

Description : Molecular diffusion is caused by the (A) Transfer of molecules from low concentration to high concentration region (B) Thermal energy of the molecules (C) Activation energy of the molecules (D) Potential energy of the molecules

Last Answer : (B) Thermal energy of the molecules

In the passive diffusion, solute molecules cross the membrane as a result of A- concentration difference B- pressure difference C- ionic difference D- all of these

Description : In the passive diffusion, solute molecules cross the membrane as a result of A- concentration difference B- pressure difference C- ionic difference D- all of these

Last Answer : concentration difference

What is facilitated diffusion? -Biology

Description : What is facilitated diffusion? -Biology

Last Answer : answer:

How is facilitated diffusion different from simple diffusion? -Biology

Description : How is facilitated diffusion different from simple diffusion? -Biology

Last Answer : answer:

How is facilitated diffusion similar to active transport How is it different?

Description : How is facilitated diffusion similar to active transport How is it different?

Last Answer : Need answer

Thyroid gland takes up circulating iodine (A) By simple diffusion (B) By facilitated diffusion (C) By active uptake (D) In exchange for chloride

Description : Thyroid gland takes up circulating iodine (A) By simple diffusion (B) By facilitated diffusion (C) By active uptake (D) In exchange for chloride

Last Answer : Answer : C

Intestinal absorption of calcium occurs by (A) Active takeup (B) Simple diffusion (C) Facilitated diffusion (D) Endocytosis

Description : Intestinal absorption of calcium occurs by (A) Active takeup (B) Simple diffusion (C) Facilitated diffusion (D) Endocytosis

Last Answer : Answer : A

Fatty acids can be transported into and out of cell membrane by (A) Active transport (B) Facilitated transport (C) Diffusion (D) Osmosis

Description : Fatty acids can be transported into and out of cell membrane by (A) Active transport (B) Facilitated transport (C) Diffusion (D) Osmosis

Last Answer : B

What do facilitated diffusion and active transport have in common ?

Description : What do facilitated diffusion and active transport have in common ?

Last Answer : What are the differences between them? Facilitated diffusion can be confused with active transport because in both processes there is participation of membrane proteins. In active transport however the ... it does not require energy. Cell Membrane Review - Image Diversity: active transport

How does facilitated diffusion present similarities with enzymatic chemical reactions ?

Description : How does facilitated diffusion present similarities with enzymatic chemical reactions ?

Last Answer : One of the main examples of facilitated transport is the entrance of glucose from the blood into cells. Glucose from blood binds to specific permeases (hexose-transporting permeases) present in the ... job is concluded the permease is not consumed and can perform successive other transports.

What is the difference between simple and facilitated diffusion ?

Description : What is the difference between simple and facilitated diffusion ?

Last Answer : Facilitated by which type of molecule does the term facilitated mean? Simple diffusion is the direct passage of substances across the membrane in favor of their concentration gradient. In ... their passage through the membrane. Cell Membrane Review - Image Diversity: facilitated diffusion

Q. What are the salient features of facilitated diffusion?

Description : Q. What are the salient features of facilitated diffusion?

Last Answer : A. It is carrier mediated. It does not require energy directly

Sugars depend on which mechanism to enter the cell a. facilitated diffusion b. active transport c. both d. none of them

Description : Sugars depend on which mechanism to enter the cell a. facilitated diffusion b. active transport c. both d. none of them

Last Answer : facilitated diffusion

Which transmembrane movement involves carriers? a. facilitated diffusion b. active transport c. both d. none of them

Description : Which transmembrane movement involves carriers? a. facilitated diffusion b. active transport c. both d. none of them

Last Answer : both

Fructose is absorbed into the blood through mucosa cells of intestine by the process called (a) active transport (b) facilitated transport (c) simple diffusion (d) co-transport mechanism.

Description : Fructose is absorbed into the blood through mucosa cells of intestine by the process called (a) active transport (b) facilitated transport (c) simple diffusion (d) co-transport mechanism.

Last Answer : (b) facilitated transport

The movement of glucose into a cell occurs by a. Facilitated diffusion. b. Active transport. c. Simple diffusion. d. Phospholipid exchange.

Description : The movement of glucose into a cell occurs by a. Facilitated diffusion. b. Active transport. c. Simple diffusion. d. Phospholipid exchange.

Last Answer : b. Active transport.

Majority of drugs cross biological membranes primarily by: A. Passive diffusion B. Facilitated diffusion C. Active transport D. Pinocytosis

Description : Majority of drugs cross biological membranes primarily by: A. Passive diffusion B. Facilitated diffusion C. Active transport D. Pinocytosis

Last Answer : A. Passive diffusion

Majority of drugs cross biological membranes primarily by: A. Passive diffusion B. Facilitated diffusion C. Active transport D. Pinocytosis

Description : Majority of drugs cross biological membranes primarily by: A. Passive diffusion B. Facilitated diffusion C. Active transport D. Pinocytosis

Last Answer : C. Is affected by extent of ionization of drug molecules

The random movement of particles in solution towar a uniform distribution is termed: a) osmosis b) repulsion c) diffusion d) facilitated diffusion

Description : The random movement of particles in solution towar a uniform distribution is termed: a) osmosis b) repulsion c) diffusion d) facilitated diffusion

Last Answer : ANSWER: C -- DIFFUSION

A metabolic pathways is a (A) Route taken by chemicals (B) Sequence of enzyme facilitated chemical reactions (C) Route taken by an enzyme from one reaction to another (D) Sequence of origin of organic molecules

Description : A metabolic pathways is a (A) Route taken by chemicals (B) Sequence of enzyme facilitated chemical reactions (C) Route taken by an enzyme from one reaction to another (D) Sequence of origin of organic molecules

Last Answer : Answer : B

The process of moving molecules against an electro-chemical gradient is:

Description : The process of moving molecules against an electro-chemical gradient is:

Last Answer : ANSWER: ACTIVE TRANSPORT

The movement of Ions against the concentration gradient will be -

Description : The movement of Ions against the concentration gradient will be -

Last Answer : The movement of Ions against the concentration gradient will be - A. Active transport B. Osmosis C. Diffusion D. All

Concentration gradient of axoplasm at resting stage is maintained by

Description : Concentration gradient of axoplasm at resting stage is maintained by

Last Answer : Concentration gradient of axoplasm at resting stage is maintained by

Concentration gradient of axoplasm at resting stage is maintained by

Description : Concentration gradient of axoplasm at resting stage is maintained by

Last Answer : Concentration gradient of axoplasm at resting stage is maintained by

The movement of Ions against the concentration gradient will be -

Description : The movement of Ions against the concentration gradient will be -

Last Answer : The movement of Ions against the concentration gradient will be - A. Active transport B. Osmosis C. Diffusion D. All of these

Absorbed of water against a concentration gradient by using energy released from respiration is called as

Description : Absorbed of water against a concentration gradient by using energy released from respiration is called as

Last Answer : Ans. Active absorption

A striking feature of living cells is a marked difference between the composition of the cytosol and the extracellular milieu. Which of the following statement(s) concerning the mechanisms of maintenance of these differences is/are true? a. The cell membrane is able to maintain a 10,000 fold gradient between the extracellular concentration of ionized calcium and the intracellular concentration b. The key to these differences is the fact that the plasma membrane is normally impermeable to sodium, potassium and calcium c. The selectivity of biologic membranes is highly consistent and seldom changes d. The selectivity of cell membranes relates only to ions and not organic compounds

Description : A striking feature of living cells is a marked difference between the composition of the cytosol and the extracellular milieu. Which of the following statement(s) concerning the mechanisms of maintenance ... d. The selectivity of cell membranes relates only to ions and not organic compounds

Last Answer : Answer: a The survival of the cell requires that cytosolic composition be maintained within narrow limits, despite the constant influx of nutrients and the simultaneous outflow of waste. A ... be altered drastically as a result of regulatory or signaling processes that occur within the cell

What is the relation between concentration gradient and active and passive transport ?

Description : What is the relation between concentration gradient and active and passive transport ?

Last Answer : Passive transport is the movement of substances across membranes in favor of their concentration gradient, i.e., from a more concentrated region to a less concentrated region. Active transport, in ... two regions while passive transport acts in a manner to reduce the concentration gradient.

What is meant by concentration gradient ?

Description : What is meant by concentration gradient ?

Last Answer : Is it correct to refer to concentration gradient of water ? Concentration gradient is the difference of concentration of a substance between two regions. Concentration is a term used to designate the quantity of ... it is not correct to refer to concentration of water in a given solution.

Movement of cell against concentration gradient is called?

Description : Movement of cell against concentration gradient is called?

Last Answer : active transport

The action potential of a neuron a. is initiated by efflux of Na+ b. is terminated by efflux of K+ c. declines in amplitude as it moves along the axon d. results in a transient reversal of the concentration gradient of Na+ across the cell membrane e. is not associated with any net movement of Na+ or K+ across the cell membrane

Description : The action potential of a neuron a. is initiated by efflux of Na+ b. is terminated by efflux of K+ c. declines in amplitude as it moves along the axon d. results in a transient reversal of the ... the cell membrane e. is not associated with any net movement of Na+ or K+ across the cell membrane

Last Answer : is terminated by efflux of K+

Which of the following is not a feature of active transport of solutes in plants ? (a) Occurs against concentration gradient (b) Non-selective (c) Occurs through membranes (d) Requires ATP

Description : Which of the following is not a feature of active transport of solutes in plants ? (a) Occurs against concentration gradient (b) Non-selective (c) Occurs through membranes (d) Requires ATP

Last Answer : Non-selective

Active and passive transports across cell membrane differ in (a) passive transport is nonselective(b) passive transport is along the concentration gradient while active transport is due to metabolic energy (c) active transport is more rapid (d) passive transport is confined to anions while active transport is confined to cations.

Description : Active and passive transports across cell membrane differ in (a) passive transport is nonselective (b) passive transport is along the concentration gradient while active transport is due to metabolic ... (d) passive transport is confined to anions while active transport is confined to cations.

Last Answer : (b) passive transport is along the concentration gradient while active transport is due to metabolic energy

A key process in metabolism is the transport of hydrogen ions (H+) across a membrane to create a concentration gradient. Explain which arrangement of hydrogen ions (unequal concentration or equal concentration) allows work to be done.

Description : A key process in metabolism is the transport of hydrogen ions (H+) across a membrane to create a concentration gradient. Explain which arrangement of hydrogen ions (unequal concentration or equal concentration) allows work to be done.

Last Answer : It is clear that an unequal concentration, not an equal one, would be the only possibility that work will be done; the unequal concentration of hydrogen ions would allow them to flow across the membrane and increase not only entropy but also work.

What are the changes of molecules in diffusion process ?

Description : What are the changes of molecules in diffusion process ?

Last Answer : Molecular pressure changes during diffusion.

In diffusion, particle/molecules moves from region of

Description : In diffusion, particle/molecules moves from region of

Last Answer : Ans. Higher to lower concentration

The process of union of two or more molecules of a substance to form a large single molecule is called : (1) Fusion (2) Diffusion (3) Polymerization (4) Synthesis

Description : The process of union of two or more molecules of a substance to form a large single molecule is called : (1) Fusion (2) Diffusion (3) Polymerization (4) Synthesis

Last Answer : (3) Polymerization Explanation: Polymerisation is the chemical process of monomers joining together to form polymers, often it takes many thousands of monomers to make a single polymer.

The process by which cell can take in fluid and molecules too large to be carried across the plasma membrane by active transport is called a. phagocytosis b. Pinocytosis c. absorption d. diffusion

Description : The process by which cell can take in fluid and molecules too large to be carried across the plasma membrane by active transport is called a. phagocytosis b. Pinocytosis c. absorption d. diffusion

Last Answer : Pinocytosis

The mechanism by which neostigmine improves contraction of myasthenic muscle involves: A. Repetitive binding of the acetylcholine molecules to the same receptors at the muscle endplate B. Diffusion of acetylcholine released from motor nerve endings to a wider area activating neighbouring receptors C. Activation of motor end-plate receptors by neostigmine molecules themselves D. All of the above

Description : The mechanism by which neostigmine improves contraction of myasthenic muscle involves: A. Repetitive binding of the acetylcholine molecules to the same receptors at the muscle endplate B. Diffusion of ... Activation of motor end-plate receptors by neostigmine molecules themselves D. All of the above

Last Answer : D. All of the above

The anticholinesterase action of edrophonium is short lasting because termination of its action depends on: A. Dissociation and diffusion of the drug from the enzyme B. Hydrolysis of the drug by the enzyme C. Synthesis of fresh enzyme molecules D. A combination of the above three processes

Description : The anticholinesterase action of edrophonium is short lasting because termination of its action depends on: A. Dissociation and diffusion of the drug from the enzyme B. Hydrolysis of the drug by the enzyme C. Synthesis of fresh enzyme molecules D. A combination of the above three processes

Last Answer : A. Dissociation and diffusion of the drug from the enzyme

3 Diffusion of drugs across cell membrane: A. Is dependent upon metabolic activity of the cell B. Is competitively inhibited by chemically related drugs C. Is affected by extent of ionization of drug molecules D. Exhibits saturation kinetics

Description : 3 Diffusion of drugs across cell membrane: A. Is dependent upon metabolic activity of the cell B. Is competitively inhibited by chemically related drugs C. Is affected by extent of ionization of drug molecules D. Exhibits saturation kinetics

Last Answer : C. Is affected by extent of ionization of drug molecules

The mechanism by which neostigmine improves contraction of myasthenic muscle involves: A. Repetitive binding of the acetylcholine molecules to the same receptors at the muscle endplate B. Diffusion of acetylcholine released from motor nerve endings to a wider area activating neighbouring receptors C. Activation of motor end-plate receptors by neostigmine molecules themselves D. All of the above

Description : The mechanism by which neostigmine improves contraction of myasthenic muscle involves: A. Repetitive binding of the acetylcholine molecules to the same receptors at the muscle endplate B. Diffusion of ... Activation of motor end-plate receptors by neostigmine molecules themselves D. All of the above

Last Answer : D. All of the above