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

Define gelatin - tests for presence of exoenzymatic activity, Explain Gelat...

Explain Gelatin - Tests for Presence of Exoenzymatic Activity? Gelatin is an incomplete protein as it lacks amino acid tryptophan. It is a major component of connective tissue

Antimicrobial barriers - proliferation of microorganisms, Q. Antimicrobial...

Q. Antimicrobial Barriers -  proliferation of microorganisms? The first barrier is the integument: a physical barrier to protect the food, e.g., the shell on eggs, the skin on

Consumptive use values, This means the non-market value of natural products...

This means the non-market value of natural products such as firewood, game and fodder that do not pass through a market or product preparation. Indigenous people in developing cou

Explain the characteristics of cancer, Explain the Characteristics of Cance...

Explain the Characteristics of Cancer? The important characteristics of cancer are excessive cellular multiplication, invasiveness and autonomy. The active process of invasion

Who created the two-part naming system used in biology, Who created the two...

Who created the two-part naming system used in biology? The scientific naming system that is used worldwide today was primary devised by Swedish naturalist Carl Linnaeus in 173

Primary production - ecosystem, Primary Production - Ecosystem Energy ...

Primary Production - Ecosystem Energy accumulated by plants during photosynthesis is called production or more specifically primary production. It is the first and the basic f

What are the mitochondria, Q. What are the mitochondria? What is the fundam...

Q. What are the mitochondria? What is the fundamental morphology of these organelles and in which cells can they be found? Mitochondria are the organelles in which the most sig

Explain third mitotic period, Q. What are the major events of the third mit...

Q. What are the major events of the third mitotic period? The third mitotic period is anaphase. In anaphase the following events occur breaking and duplication of centromeres w

Explain zipping of the apical canal, Explain Zipping of the Apical Canal ...

Explain Zipping of the Apical Canal a. If the preparation is continued with progressively larger and stiffer file lead to : zipping perforation or tear apical foramen.

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