Please enable JavaScript.
Coggle requires JavaScript to display documents.
cells - Coggle Diagram
cells
animal and plant cells
animal
Animal cells have a basic structure. Below the basic structure is shown in the same animal cell, on the left viewed with the light microscope, and on the right with the transmission electron microscope.
-
-
transport in cells
diffusion
articles (molecules and ions) in a liquid and a gas move continuously. Because of this movement, particles will spread themselves evenly throughout a liquid or a gas.
If there is a situation where particles of a substance are in a higher concentration, they will move from this region to where they are in a lower concentration. This is called diffusion.
-
will move in both directions, but there will be a net movement from high to low concentration
will end up evenly spread throughout the liquid or gas, but will continue to move
osmosis
is the diffusion of water molecules, from a region where the water molecules are in higher concentration, to a region where they are in lower concentration, through a partially permeable membrane.
A dilute solution contains a high concentration of water molecules, while a concentrated solution contains a low concentration of water molecules.
-
-
cell division
chromosomes and DNA
Chromosomes carry genetic information in a molecule called DNA.
A type of cell division called mitosis ensures that when a cell divides each new cell produced has the same genetic information.
DNA exists in a cell's nucleus within structures called chromosomes. Each section of a chromosome that contains the code for the production of a particular protein is called a gene.
Each chromosome is made from a single molecule of DNA, but when a cell is ready to divide, the DNA copies itself, then coils and condenses to form the chromosomes that we see in micrographs.
Each human body cell contains 46 chromosomes. These can be arranged into 23 pairs.
Each chromosome in a pair carries the same types of genes. The 23rd pair are the sex chromosomes: