2. Range
Number in Range
Letter Grade
0-5 F
6-10 1
11-15
16-20 2
21-25 3
26-30
31-35
36-40
41-45
46-50 5 C
51-55 13
56-59 6 C+
60-65 10 B-
66-70 B
71-75
76-79 B+
80-85 7 A-
86-90 A
91-95 A+
96-100 72

7. 16600 bp in humans
37 genes
13proteins of about 90 proteins in the respiratory chain
2 ribosomal RNAs
22 tRNA
copies per cell
per mammalian oocyte
Heteroplasmic mtDNA mutations segregate during cell division
Continous replication and turnover independent of cell cycle
different proteins