Key words

7. Process in which red blood cells are clumped together by an antibody.
9. Different versions of the same gene.
11. Short lengths of RNA that combine with specific amino acids prior to protein synthesis.
15. The whole of the genetic information of an organism or cell.
16. Length of DNA that carries specific genes in a linear sequence.
17. One of two types of chemical compound used to make nucleotides – cytosine, thymine and uracil.
18. The particular position of a gene on homologous chromosomes.
19. A covalent bond between monosaccharide residues in disaccharides and polysaccharides.
20. Formed from a triacylglycerol in which one of the fatty acid groups is replaced by an ionized phosphate group.

1. Large organic molecule made up of repeating subunits (monomers).
2. Heritable factor that consists of a length of DNA that codes for a protein.
3. Chemical compounds of the same chemical formula but different structural formulae.
4. An organic base combined with pentose sugar and phosphate.
5. A group of four-ring hydrocarbons, of which cholesterol, oestradiol and testosterone are examples.
6. Reaction where molecules are split into smaller molecules.
8. Long carbohydrate molecules attached to membrane proteins and membrane lipids.
10. Reaction that combines two molecules.
12. Having hydrophobic and hydrophilic parts on the same molecule.
13. The chemically active part of a member of a series of organic molecules.
14. Three consecutive bases in DNA which specify an amino acid.