Proteins are formed by __________ in the __________ of a cell. Ribosomes are a type of __________ which are made up of proteins and RNA. RNA is the same as DNA except that is usually only a single strand, and uses Uracil as a base rather than Thymine. The RNA in a ribosome is called __________ RNA (rRNA).
DNA is found in the __________ of the cell, but the DNA molecule is too big to fit through the pores of the __________ and so can not get into the __________. There has to be a messenger molecule, which we called __________ (mRNA).
The enzyme called RNA polymerase is able to __________ the DNA strands. The enzyme moves along the unzipped DNA and makes use of free __________ (nucleotides) found in the nucleus to make the strand of __________ RNA.
The strand of mRNA pass through pores in the nucleus wall, into __________ where __________ synthesise polypeptide (proteins).
Each triplet of bases is known as a codon, and translates into (is the code for) a specific amino acid. __________ RNA (tRNA) which has already attached itself to amino acids, pairs up with the messenger RNA. The amino acids link together to form the desired __________ .