Which of the following statements about a neurone in a healthy human is/are correct?
- Transport across its cell membrane can occur by exocytosis.
- It contains the gene that codes for insulin.
- It contains circular DNA.
A. 1, 2 and 3
B. 1 and 3 only
C. 1 and 2 only
D. 2 and 3 only
E. 1 only