(a(i))[1]
Name the enzyme marked A in Fig. 4.1.
(a(ii))[1]
Name the bond that is made between nucleotides in the primary transcript.
(b(i))[1]
State how many amino acids are coded for by the nucleotide sequence shown on the primary transcript in Fig. 4.1.
(b(ii))[2]
Use the information in Fig. 4.1 to explain why just one strand of DNA is transcribed.
(c(i))[2]
State two visible features of mitochondria in Fig. 4.2.
(c(ii))[1]
The line on Fig. 4.2 gives the diameter of one mitochondrion. Calculate the actual diameter of the mitochondrion. Give your answer to one significant figure.
(d)[3]
Mitochondrial DNA codes for some polypeptides of proteins used inside the mitochondrion. Some of these proteins permit ions to move into and out of the mitochondria. Outline the ways in which ions can move into mitochondria.