Cells 1
Selectively permeable
Cell membrane
Made of cellulose
Plant cell wall
Cell membrane is composed of....
Required molecules for cells. Diffuses through membrane.
Oxygen & Glucose
Explain plasmolysis
Loss of water in plant cell until vacuole shrinks and cell membrane pulls away from cell wall. Overall shape of cell is not altered due to cell wall.
Site of aerobic respiration
Mitochondria
Composed of many cells
Multicellular
Difference between two concentrations
Concentration gradient
Structure of the cell membrane
Phospholipid bilayer/Fluid mosaic model
A potato weighed 4g before being placed in pure water.
After the experiment it weighed 6g.
Calculate the % change
difference/original x 100
2/4 x100
0.5 x 100
=50%
Only found in bacterial cells
Plasmid/Circular chromosome
An example is yeast
Fungal cell
Molecules that cannot cross the membrane passively
Large, insoluble molecules
Definition of active transport
Movement of molecules from an area of low concentration to an area of high concentration, against a concentration gradient.
It requires energy in the form of ATP
Which has the higher water concentration?
A: 20% sucrose solution
B: 15% salt solution
C: 85% salt solution
D: 90% sucrose solution
B
Site of most of the chemical reactions in a cell
Cytoplasm
Not found in bacterial cells (3 answers)
Nucleus, chloroplast, vacuole, mitochondria
Definition of diffusion
Movement of molecules from an area of higher concentration to lower concentration, down a concentration gradient until molecules are evenly spread.
Is a passive process.
Example of active transport system in cells
Sodium-Potassium pump
True or False
The function of the nucleus is that it contains DNA
False.
Its function is to control cell activities.
Only seen with electron microscope
Ultrastructure
Site of protein synthesis
Ribosome
Definition of osmosis
Movement of water molecules from an are of higher water concentration to an area of lower water concentration, down a concentration gradient through a selectively permeable membrane.
It is a passive process.
Result of placing a red blood cell in pure water
It bursts
Contains cell sap
Vacuole