Some of the common acronyms used in the Bacterial physiology and Metabolism which you need to know from the examination point of view are:
ATP - Adenosine tri phosphate
APS - Adenosine 5-phosphosulfate
ABC - ATP Binding Cassette transporter
CFU - Colony forming unit
DPA - Dipicolinic acid
ED - Entner Doudroff pathway
EMP - Embden–Meyerhof–Parnas pathway
FAD - Flavin adenine dinucleotide
FMN - Flavin mono nucleotide
HMP - Hexose mono phosphate pathway
MPN - Most probable number
NADH or NADH H+ Nicotine adenine dinucleotide (reduced) (it should NOT be written as NADH2)
NAD - Nicotine adenine dinucleotide
Nif genes - nitrogen fixation genes
OD - optical density
PAPS - phosphoadenosine 5' phosphosulfate
PBP - Periplasmic binding proteins
PMF - Proton motive force
PPP - Pentose phosphate pathway
PTS - phosphoenol dependent phosphotransferase system
SBP - Solute binding protein
TCA - Tricarboxylic acid cycle