BI111 Lecture Notes - Lecture 8: Casparian Strip, Electrochemical Gradient, Symplast

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ambercoyote184

9 Feb 2017

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Simple diffusion is simplest form of passive transport: requires no metabolic energy, substance moves down concentration or electrochemical gradient. But how efficient is it: not very over long distances, 10 um in 0. 1sec;100 um in 1 sec; 1 mm in 100 sec. Active transport requires metabolic energy (atp: based on h+ pumps, h+ gradient maintained through atp use, h+ diffusion into cell powers uptake of solutes. Material transported in same direction as movement of h+ and solute, organic uptake. Material transported in opposite direction to movement of h+ and solute, na+ export. Diffusion: the spontaneous movement of molecules or particles along concentration gradient. Osmosis: special case of diffusion: water molecules diffuse across a selectively permeable membrane from an area to higher water concentration(low solute concentration), to a lower water concentration(high solute concentration) Hypertonic: high concentration of solutes outside of cell(salty environment water will move from areas where its abundant across its plasma membrane into the plasma)

Related Questions

1 Which of the following statements is false?

(a) CO₂ and O₂ can diffuse freely across the cell membranes.

(b) The differences in permeability between artificial lipid bilayers and cell membranes arise from variations in phospholipid content.

(d) Cells expend energy in the form of ATP hydrolysis to maintain ion concentrations that differ from those found outside the cell.

2 Cells use membranes to help maintain set ranges of ion concentrations inside and outside the cell. Which of the following ions is the most abundant inside a typical mammalian cell?

(a) Na⁺

(b) K⁺

(d) Cl^â

3 Pumps are transporters that are able to harness energy provided by other components in the cells and drive the movement of solutes across membranes, against their concentration gradient. This type of transport is called _____________.

(a) active transport.

(b) free diffusion.

(d) passive transport.

harlequinbuffalo618

A hypertonic solution has a higher level of solutes so the water moves out of the cells to the surroundings

A hypotonic solution has a higher level of solutes so the water moves out of the cells to the surroundings

The salt and water solution in the potato is a hypotonic solution

Osmosis is the movement of large molecules across a membrane which require embedded proteins

The plain water in this experiment is the solvent and the salt is the solute.

Passive transport requires no energy and the molecules move with the concentration gradient or from high concentration to low concentration

Active transport required no energy and the molecules move with the concentration gradient or from high concentration to low concentration.

The water on the inside of the potato with the salt molecules is an isotonic solution the same as the solution on the outside of the potato.

Water will not move by simple diffusion (osmosis) into or out of cells it requires energy or protein transporters

The solution of salt water in the potato has a lower concentration of water molecules so the water on the outside should move into the cells

True or False: The solution of salt water inside of the hollowpotato has a lower concentration of water molecules so the water onthe outside of the potato should move into the potato cells. Or thewater molecules inside of the grape or pea will move to the outsidewhere there are fewer water molecules and more salt.

True or False: The water on the inside of the potato with thesalt molecules is an isotonic solution the same as the solution onthe outside of the potato.

True or False: Water will not move by simple diffusion (osmosis)into or out of cells it requires energy or proteintransporters.

T or F The salt and water solution inside of the hollow potatois a hypotonic solution.

T or F: Osmosis is the movement of large molecules across a semipermeable membrane which require embedded proteins.

T or F The plain water in this experiment is the solvent and thesalt is the solute.

T or F Active transport requires no energy and the moleculesmove with the concentration gradient from low concentration to ahigh concentration.

T/F Passive transport requires no energy and the molecules movewith the concentration gradient or from high concentration to lowconcentration

T/F A hypotonic solution has a higher level of solutes so thewater moves out of the cells to the surroundings.

T/F A hypertonic solution has a higher level of solutes so thewater moves out of the cells to the surroundings.

Why does a slug die when you put salt on her/him? (Think aboutwhat happened in this lab) :

A. The salt on the outside of the slug causes the water frominside of the cells to move out of the cells. The dehydration ofthe slug causes death

B. The slug does not die but becomes enlarged from the movementof water into the slug cells caused by a hypertonic solution

C. The salt and moisture on the outside of the slug cause anisotonic state and the water leaves the slug quickly byosmosis.

D. Sigh. The poor slug, sacrificed for science by many youngnature lovers around the world. Obviously this happens as theoutside solution is hypotonic and the inside of the slug's cellsare hypertonic. Energy is used for active transport leading toosmosis.

lemonbeetle571

BI111 Lecture Notes - Lecture 8: Casparian Strip, Electrochemical Gradient, Symplast

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