The correct option is C.
Obligate anaerobes are micro organisms that are poisoned and killed when exposed to the normal atmospheric oxygen concentration. These organisms can only survive in the absences of oxygen, therefore, they carry out only anaerobic form of respiration in order to obtain the energy that they need. <span />
I believe the answer would be 20 amino acids
You would have multiple isomers:
C=c-c=c-c
C=c=c-c-c
C-c=c=c-c
<em>for deactivation of <u>lac represso</u><u>r , a lactose molecule is required that further result in transcription of RNA as a result enzymes are produced which break down lactose...</u></em>
Both answers b and d are macromolecules so either one would be correct. personally i would put b
