Driving force - mineral nutrition, Biology

Assignment Help:

Driving Force - Mineral Nutrition

Let us now find out what is the driving force involved in protein mediated transport. Many membrane transport proteins allow specific solutes to move across the lipid bilayers. If the transported molecule is uncharged, then the difference in its concentration on the two sides of the membrane, that is its concentration gradient - determines the direction of transport. However, if the solute to be transported carries a net charge, then both its concentration gradient and the total electrical gradient across the membrane influence its transport. For instance, an ion will move across a membrane if there is sufficient electrical gradient across the membrane even if the concentration gradient does not favour such a movement.

In other words, the direction of movement is decided by which of the two forces is steepest. The two gradients together constitute the electrochemical gradient. The gradient can develop in part due to the selective permeability of the membrane. So the related diffusion of cations may be more than anions or vice versa. For example, K+ diffuses out mort rapidly due to differences in electrical gradient than Cl- in the immediate exterior and hence excess of Cl- in the cell gives it a negative charge. In fact, all plasma membranes have electric potentials (Transmembrane potential) across them with inside of the cell more negative compared to the outside. This is due to active transport of ions particularly H+ ions out of the cell. This potential difference allows the entry of positively charged ions into the cell but opposes the entry of negatively charged ions.


Related Discussions:- Driving force - mineral nutrition

Modification of mitosis, MODIFICATION OF MITOSIS 1 .      CRYPTOMITOS...

MODIFICATION OF MITOSIS 1 .      CRYPTOMITOSIS OR PROMITOSIS : Primitive type of mitosis. In this mitosis nuclear membrane not disappear (remain intact throughout the div

What percentage of acid is not ionized, A weak acid (HA) has a pKa of 4.691...

A weak acid (HA) has a pKa of 4.691. If a solution of this acid has a pH of 4.920, what percentage of the acid is not ionized? (Assume all H in solution came from the ionization of

Write in brief about hba1c, Write in brief about HbA1c. HbA1c is also t...

Write in brief about HbA1c. HbA1c is also the primary glycemic (sugar) target in the management of a diabetic patient and should be performed at repeated intervals throughout t

Describe about the implant surgeon, Describe about The implant surgeon ...

Describe about The implant surgeon The implant surgeon should have basic knowledge of the macroscopic and microscopic anatomy of the jaw bones with their associated neurovascul

First stage of invagination, First Stage of Invagination The large en...

First Stage of Invagination The large endodermal cells that are remaining in the vegetal plate move laterally towards the centre of the plate and fill the gap in the vegetal

Left antero lateral thoracotomy approach, Left Antero Lateral Thoracotomy A...

Left Antero Lateral Thoracotomy Approach :  Arterial and central venous pressure monitoring lines are placed. A left antero lateral thoracotomy is done through the 5th or 4th

Cartoon, A dialogue and cartoon between haemoglobin and chlorophyll

A dialogue and cartoon between haemoglobin and chlorophyll

Management of asymptomatic patient, Q. Management of Asymptomatic Patient? ...

Q. Management of Asymptomatic Patient? The most common cause of death in a truly asymptomatic patient with severe aortic stenosis is aortic valve replacement (AVR). While expec

Tail - structure of the sperm, Tail - Structure of the Sperm The tail ...

Tail - Structure of the Sperm The tail or flagellum is the longest part of the sperm. By its movement it causes the sperm to swim with the head forward. It consists of a thin

Phospholipids exhibit important biological functions, Phospholipids exhibi...

Phospholipids exhibit  important biological functions. They are: a)  increase  the rate of fatty acid oxidation b)  act as inorganic ion carrier across the membrane c) hel

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd