B2 - Cell Division Flashcards
Write ‘chromosome, DNA, cell, gene and nucleus’ in order from largest to smallest
Cell, nucleus, chromosome, DNA, gene
What is a cell?
The smallest structural and functional unit of an organism
What is a nucleus?
structure that contains genetic material and controls the activities of the cell
What is a chromosome?
A thread like structure of coiled DNA found in the nucleus of eukaryotic cells.
What is a DNA?
A polymer made up of two strands forming a double helix.
What is a gene?
A section of DNA that codes for a specific protein or characteristic
The ___ the difference in concentrations, the faster the rate of diffusion.
The greater the difference in concentrations, the faster the rate of diffusion.
How is the small intestine adapted for diffusion?
The small intestine contains villi which:
- Increase the surface area
- Have a good blood supply to maintain concentration gradient
- Thin membranes for a short diffusion distance
