BIOL150 Chapter Notes -Antiporter, Passive Transport, Facilitated Diffusion

20 views2 pages

grayelephant135

3 Nov 2014

School

University of Waterloo

Department

Biology

Course

BIOL150

Professor

Tristan A F Long

For unlimited access to Textbook Notes, a Class+ subscription is required.

Document Summary

Diffusion: from a high region of concentration to a region of low concentration. Passive transport: requires no energy to transport, large molecules travel through this transport. Small molecules just move through the layers easily. Dynamic equilibrium is reached when individual molecules or ions continue to move randomly across the membrane in both directions, no net movement. Osmosis: high conc. to low conc, through a selectively permeable membrane. Hypertonic : a greater solute concentration outside than inside; Hypotonic : a lesser solute concentration outside than inside; or. Isotonic : equal solute concentrations outside and inside. Uniport:single type of substance is transported in a single direction along the conc. gradient. Symport: 2 or more different substances are moved in the same direction. Antiport:2 different substances are moved in opposite directions. Facilitated diffusion , polar molecules and ions unable to cross the membrane on their own can diffuse with the help of transport proteins.

Related Questions

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

Please help! Not sure about these questions..thanks

Which can cross the phospholipid bilayer of a membrane without assistance from transport proteins?

	A.	Ions such as Na+.
	B.	Small hydrophobic molecules such as O2.
	C.	Small hydrophilic molecules such as glucose.
	D.	Any small molecule or ion.

QUESTION 2

Which transport process requires a cell to expend energy?

	A.	Moving a solute up its concentration gradient.
	B.	No transport processes require energy.
	C.	Moving a solute either up or down its concentration gradient.
	D.	Moving a solute down its concentration gradient.

QUESTION 3

Imagine a cell whose membrane is permeable to water, but impermeable to solute X. If solute X is more concentrated outside the cell than inside, which way will water move by osmosis?

	A.	Water will not move in either direction, in or out of the cell.
	B.	Water will move equally in both directions, in and out of the cell.
	C.	Water will leave the cell.
	D.	Water will enter the cell.

QUESTION 4

The cellular structure that encloses the DNA/genes is the

		ribosome.
		plasma membrane.
		nucleus.
		mitochondrion.

QUESTION 5

The part of metabolism that builds larger, more complex molecules or structures from smaller, simpler components is

	A.	anabolism.
	B.	catabolism.
	C.	catalysis.
	D.	hydrolysis.

QUESTION 6

In an exergonic reaction

	A.	the reactants have more energy than the products, so energy is absorbed.
	B.	the reactants have more energy than the products, so energy is released.
	C.	the reactants have less energy than the products, so energy is released.
	D.	the reactants have less energy than the products, so energy is absorbed.

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

BIOL150 Chapter Notes -Antiporter, Passive Transport, Facilitated Diffusion

Document Summary

Get access

Related Documents

BIOL150 Lecture Notes - Lecture 12: Osmosis, Active Transport, Passive Transport

BIOL150 Chapter 1-5: Module 1 Notes

BIOL150 Lecture : Life in Water.docx

Related Questions