BSC 2023 Lecture Notes - Lecture 17: Cell Membrane, Tonicity, Osmosis

16 views3 pages

olivecattle778

14 Mar 2018

School

Department

Course

Professor

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

Document Summary

Diffusion movement of molecules or ions from a region of higher to lower concentration. Osmosis diffusion of water across a selectively permeable membrane. Tonicity the osmotic characteristics of a solution across a particular membrane. Isotonic same concentration of nondiffusible solutes and water on both sides of the plasma membrane. Higher concentration of solutes and lower concentration of water outside the cell than inside the cells. Hypotonic lower concentration of solutes and higher concentration of water outside the cell than inside the cells. Red blood cells in homeostasis have a nacl concentration of 0. 9%. Facilitated transport use of a plasma membrane carrier to move a substance into or out of a cell from higher to lower concentration. Active transport use of a plasma membrane carrier to move a substance into or out of a cell from lower to higher concentration. Metabolism all chemical reactions that occur in a cell.

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

Which is the only substance involved in osmosis?

alcohol

salt

sugar

water

If a solution outside of a cell has a lower concentration of solutes inside of a cell, it is referred to as what?

hypotonic

facilitated

hypertonic

isotonic

In an electron microscope, what type of cells are used?

dead, but fresh cells

live and fresh cells

dead, processed cells

live, processed cells

Which model best describes the observations and functions of the plasma membrane?

phospholipid bilayer

cell membrane

fluid mosaic model

nuclear envelope

1,Match the descriptions to the type of transport.

- A. B. C.	Water enters a cell because it is hypertonic compared to the extracellular environment, increasing its turgor pressure
- A. B. C.	Water enters guard cells because the guard cells are hypertonic compared to the surrounding cells
- A. B. C.	Potassium ions are pumped into guard cells
- A. B. C.	The motor cells of a Venus fly trap are hypotonic compared to surrounding cells, causing water to leave the motor cells
- A. B. C.	Sugar is loaded into the phloem

A.	Both active and passive transport
B.	Passive Transport
C.	Active transport

2,Describe what is wrong with the following statement and explain why:

All prokaryotic and eukaryotic cells contain plasma membrane, nucleus, ribosomes, organelles, cytoplasm, and cell walls.

What is short-distance transport?

	a,	The movement of solutes from a region of low concentration to a region of high concentration
		b,The movement of water, nutrients, and other substances between cells
c,		The movement of substances from a region of high concentration to a region of low concentration
d,		The movement of water across a semipermeable membrane from a region of low solute concentration to a region of high solute concentration.

What terms describe the movement of water across a semipermeable membrane from a region of high water concentration towards a region of low water concentration (and high solute concentration.)

What is found in the proptoplasm?

Cell wall, cytoplasm, plasma membrane, nucleus, and other cell organelles

Plasmodesmata, cell wall, and plasma membrane

Cell wall, cytoplasm, and plasma membrane

Cytoplasm, nucleus, and other cell organelles

The channels that allow nutrients and protoplasm to pass between plant cells are called _________________.

What happens when a plant cell is placed in a hypotonic solution?

Water will enter the plant cell and the plasma membrane will swell and cell lysis will occur

Water will leave the plant cell and the plasma membrane will pull away from the cell and plasmolysis will occur

Water will enter the plant cell and the plasma membrane will swell and push against the cell wall

Water will leave the plant cell and the plant cell will lose turgor pressure, causing the plant to wilt

________________ transport uses cellular energy.

What molecules make plasma cell membranes hydrophilic on the outside and hydrophobic on the inside?

What type of cells do plants have?

		Bacterial
		Archaeic
		Eukaryotic
		Prokaryotic

BSC 2023 Lecture Notes - Lecture 17: Cell Membrane, Tonicity, Osmosis

Document Summary

Get access

Related Documents

BSC 2023 Lecture Notes - Lecture 1: Lipid Bilayer, Cellular Respiration, G1 Phase

BSC 2023 Lecture Notes - Lecture 10: Cell Membrane, Activation Energy, Sodium Chloride

BIO 121 Lecture Notes - Eukaryote, Chromatin, Pinocytosis

Related Questions