In many cases, signaling factors maintain the stem cell in an uncommitted state.

TLS Online TPP Program

#Id: 2728

#Unit 12. Applied Biology

Which one of the following can be used as a selection marker for developing transgenic plants?

green fluorescent protein

β-glucuronidase

β-galactosidase

hygromycin phosphotransferase

 

TLS Online TPP Program

#Id: 2729

#Unit 12. Applied Biology

 Golden rice

The transgenic rice, popularly called "golden rice" contains good quantities of carotene, which gives the grains a golden colour. In one transgenic line, the β-carotene content was as high as 85% of the total carotenoids present in the grain.

TLS Online TPP Program

#Id: 2730

#Unit 12. Applied Biology

TLS Online TPP Program

#Id: 2731

#Unit 12. Applied Biology

Bioplastic

Polyhydroxyalkanoates (PHAs), e.g., po1yhydroxybutyrate (PHB), are synthesized from Acetyl co.A used as precursor, and are used for the synthesis of biodegradable plastics with thermoplastic properties. 

At present, PHAs are produced by bacterial fermentation based on Ralstonia eutropha. 

 

 

 

TLS Online TPP Program

#Id: 2732

#Unit 12. Applied Biology

TLS Online TPP Program

#Id: 2733

#Unit 12. Applied Biology

For the generation of transgenic plant in crop improvement, one important regulatory gene ‘X’ was overexpressed in a crop plant. Out of 30 transgenic rice plants generated, 22 showed high levels of gene ‘X’ expression. However, rest 8 lines displayed low level of expression. One explanation of such observation may be: 

Suppression effect of the transgene 

Knock down effect of gene X 

Gene silencing effect 

Co-suppression effect of transgene