ZOO 3210 Lecture Notes - Lecture 4: Osmosis, Membrane Potential, Peter Agre

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11 Oct 2017

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Page 14 of lecture 4 notes has a chart on it that you"ll need to know apparently every cell maintains concentrations of inorganic solutes inside the cell that are very different from those outside types of membrane transport. 2. active: requires no energy direction of solute movement: [high] to [low] requires atp direction of solute movement: [low] to [high] types of passive transport: Page 16 has a few types of membrane transport drawn out the kinetics of facilitated transport the saturation kinetics of facilitated transporters follows a hyperbolic relationship, i. e. michaelis-menten kinetics. Page 18 has a few illustrations of membrane transporters discovery of aquaporins. Peter agre won the nobel prize in chemistry (2003) for his discovery of the water channel, i. e. aquaporins (aqp) achievements: determined dna and amino acid sequences of the water channel aqp1 used . Peter agre and his team investigated the properties of laevis oocytes microinjected with the rna that codes for the protein.

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

1. To move molecules from a low concentration on one side of amembrane to a high concentration on the other side of a membrane,which would be needed?
A.
Time
B.
A protein that can engage in facilitated diffusion
C.
An active (energy-requiring) process that moves the moleculesdirectly rather than relying on diffusion

Answer choice c

2. If a cell transports a number of these ions across the membrane,which direction of transport would require energy from thecell?
A.
From the outside to the inside of the cell
B.
From the inside to the outside of the cell

Answer choice A

3. Which of the following is not true of the carrier moleculesinvolved in
facilitated diffusion?

A.
They do not require energy to operate.
B.
They can concentrate molecules on one side of the membrane.
C.
They allow molecules to travel both directions across amembrane.
D.
They may undergo a structural (conformational) change upon bindinga molecule.

Answer choice D

ZOO 3210 Lecture Notes - Lecture 4: Osmosis, Membrane Potential, Peter Agre

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