Simplified biosynthetic pathway for cytokinin biosynthesis followed given such steps;

a) isopentenyl transferase (IPT), is the addition of the isopentenyl side chain from DMAPP (dimethylallyl diphosphate) to an adenosine moiety (AMP)

b) iPRTP or iPRDP is converted to ZTP or ZDP respectively by cytochrome P450 monooxygenase  and eventually is converted to zeatin

c) The ribotide and riboside forms of trans-zeatin can be interconverted, and free transzeatin can be formed from the ribotide by the LONELY GUY (LOG) family of cytokinin

Which of the following steps is true of the cytokinin biosynthesis?

TLS Online TPP Program

#Question id: 199

#Unit 1. Molecules and their Interaction Relevant to Biology

The ʺ+ʺ sign in NAD+ indicates that

TLS Online TPP Program

#Question id: 200

#Unit 1. Molecules and their Interaction Relevant to Biology

When NAD+ is reduced, the UV absorbance at 340 nm

TLS Online TPP Program

#Question id: 201

#Unit 1. Molecules and their Interaction Relevant to Biology

The product(s) of lactate dehydrogenase under anaerobic conditions is (are)

A) pyruvic acid.

B) NAD+.

C) NADH.

TLS Online TPP Program

#Question id: 202

#Unit 1. Molecules and their Interaction Relevant to Biology

Unlike NADH and NADPH, Which of the following is correct for FAD and FADH

A) donate one electron at a time.

B) donate one or two electrons at a time.

C) do not become positively charged.

TLS Online TPP Program

#Question id: 203

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following two-electron transfer reactions can be linked to one-electron transfer reactions by

A) formation of semiquinones.

B) a [Fe-S] cluster.

C) NADH and NADPH.

TLS Online TPP Program

#Question id: 204

#Unit 1. Molecules and their Interaction Relevant to Biology

Acyl-group-transfer reactions often involve which coenzyme?