BIOL3149 Study Guide - Quiz Guide: Integral Membrane Protein, Facilitated Diffusion, Glycerol

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13 Jul 2016

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Used for molecules too large or too polar to diffuse on their own. Uses the concentration gradient of a compound to move it across the membrane from a higher concentration to a lower concentration: equalizes the internal and external concentrations of a solute. Aquaporin channel, transports water and small polar molecules like glycerol. Glycerol transport is performed by glpf an integral membrane protein in e. coli: glycerol is important for energy ad building phospholipids. When the concentration of glycerol inside the cytoplasm = concentration of glycerol outside of the cell, the glycerol can be released. Can take molecules from outside the cell and concentrate them inside, it"s the ability to import nutrients against their natural concentration gradients. Form of active transport where the energy of one chemical gradient is exchanged for another: the most common type of chemical gradient used is that of ions.

Related Questions

QUESTION 1

Ion diffusion across plasma membrane needs

		a concentration gradient across the membrane
		specific transporters
		ATP
		provide extra energy for the transport

2 points

QUESTION 2

There are four types of large biological molecules

2 points

QUESTION 3

Active transporters transport substances across cell membrane against ____________

2 points

QUESTION 4

Which of the following is a nonpolar amino acid?

	1.	Valine
	2.	Serine
	3.	Aspartic acid
	4.	Glutamic acid

2 points

QUESTION 5

Membrane potential of a cell is created by:

	1.	sodium ion concentration difference between inside and outside of the cell
	2.	a difference in protein concentration across the cell membrane
	3.	an electrical potential difference between the intracellular fluid and the surrounding extracellular fluid
	4.	a difference between the potassium concentration inside and outside of the cell

2 points

QUESTION 6

A mutation resulted in a change from a valine to a glutamic acid in a peptide sequence. This mutation will NOT change the protein folding

True

False

2 points

QUESTION 7

Ions can be transported across plasma membrane by

	1.	diffusion
	2.	No need of transporters
	3.	osmosis
	4.	active transport

2 points

QUESTION 8

Phospholipid is composed of

	1.	A glycerol backbone
	2.	One protein group
	3.	One carbohydrate group
	4.	Two fatty acid chains and one phosphate group

2 points

QUESTION 9

Prokaryotic cells and eukaryotic cells are similar in

	1.	Plasma membrane
	2.	nucleus
	3.	mechanism for protein translation
	4.	endoplasmic reticulum

2 points

QUESTION 10

Disulfide bonds are formed between two histidine residues

True

False

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

BIOL3149 Study Guide - Quiz Guide: Integral Membrane Protein, Facilitated Diffusion, Glycerol

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