intro to metabolism: enzymes Flashcards
1
Q
what are enzymes
A
protein catalysts that speed up rxns by lowering activation nrg
2
Q
what are cofactors
A
non protein component, required for some enzyme’s activity. 2 groups prosthetic and conenzymes
3
Q
haloenzyme
A
apoenzyme + cofactor
4
Q
prosethetic group
A
firmly attached to apoenzyme. eg heme(fe2+), FAD, FMN, FeS clusters
5
Q
heme groups
A
5 structurally diff hemes called A.B,C,D, and O. each diff reduction p
6
Q
eg of holoenzymes
A
cytochrome, flavoproteins, FeS proteins
7
Q
what are coenzymes
A
organic cofactors that carry e-, H+, or organic groups from enzyme to another
8
Q
eg of coenzymes
A
i) NAD+, 2e- +2H+
ii) Coenzyme A, acetyl~CoA
iii) ADP, carries a phosphate
iv) Ubiquinone and meniquinone carries 2H+
