AQA A level Biology - Topic 4

how is dna in eukaryotic cells described

long linear and associated with proteins(histones)

how is dna in prokaryotic cells described

short circular and not associated with histones

what is a dna molecule and its associated protein called

a chromosome

what is the dna in mitochondria and chloroplast described as

short circular and not associated with protein

what is a gene

a base sequence of DNA that codes for the amino acid sequence of a polypeptide by coding for a functional RNA

what is the name of the fixed position a gene holds of a particular DNA molecule

a locus

what is the sequence of three bases called

a triplet

what are the three things the genetic code is described as

universal, non overlapping and degenerate

what does the triplet (sequence of 3 bases) code for

a specifc amino acid

what are diffrent versions of gees called

allelles

what does universal genetic code mean

same specifc base triplets code for the same amino acids in all living things

what does degenerate genetic code mean

there is more than one possible combination of triplets that code for the same amino acid