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

Risk analysis- definiton of food, Risk analysis- Definiton of Food Food...

Risk analysis- Definiton of Food Food  :  Any  substance,  whether processed,  semi- processed  or  raw  which  is intended for human consumption, containing drinks, chewing gu

Nucleolus, NUCLEOLUS Discovered by Fontana and name given by Bowm...

NUCLEOLUS Discovered by Fontana and name given by Bowman. It is naked structure that is attached to chromatin at specific point called nucleolar organiser region or

How do birds reproduce, Q. How do birds reproduce? Birds like every ver...

Q. How do birds reproduce? Birds like every vertebrate have sexual reproduction. Their embryos develop within shelled eggs containing extraembryonic membranes and exterior the

Saturated fatty acids required for dyslipidemia, Q. Saturated Fatty Acids r...

Q. Saturated Fatty Acids required for dyslipidemia? Saturated Fatty Acids (SFA): These are found mostly in animal fats as white marble-like solid at room temperature. Red meats

Stirred tank reactors, The next set of lectures in this course cover a num...

The next set of lectures in this course cover a number of topics including fermenter design, power consumption, oxygen transfer and mixing. The aim of these lectures is to underst

Determine the digestion of carbohydrates, How does the pancreatic juice res...

How does the pancreatic juice resume the digestion of carbohydrates? What is the involved enzyme? Carbohydrate digestion starts with the action of the salivary amylase (ptyalin

Define pipette - nutritional biochemistry, Define Pipette - Nutritional Bio...

Define Pipette - Nutritional Biochemistry? Pipettes are used to deliver a known volume of liquid from one container to another. They are precision instruments of measurement an

Patterns of cleavage, P A TTERNS OF CLEAVAGE - Patterns of cleavage d...

P A TTERNS OF CLEAVAGE - Patterns of cleavage depends upon amount of yolk & distribution of yolk. These are following types - 1 .       RADIAL CLEAVAGE PATTERN -

Anatomy, what are the names of twelve cranial nerves

what are the names of twelve cranial nerves

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