Which of the factors below weaken the hypothesis of abiotic synthesis of organic monomers in early Earthʹs atmosphere?

1.  the relatively short time between intense meteor bombardment and appearance of the first life forms

2.  the lack of experimental evidence that organic monomers can form by abiotic synthesis

3.  Uncertainty about which gases comprised early Earthʹs atmosphere

TLS Online TPP Program

#Question id: 4205

#Unit 3. Fundamental Processes

Puromycin is an antibiotic that inhibits protein synthesis because

TLS Online TPP Program

#Question id: 4206

#Unit 3. Fundamental Processes

Ribosomal protein synthesis is controlled by inhibitor proteins, the genes of which are located on the ribosomal protein operon, and which bind to __ when ribosome assembly slows and bind to __ when ribosome assembly is proceeding at a steady rate.

TLS Online TPP Program

#Question id: 4207

#Unit 3. Fundamental Processes

 If there is more globin than heme present in a reticulocyte, globin synthesis is stopped by

TLS Online TPP Program

#Question id: 4208

#Unit 3. Fundamental Processes

Tryptophan synthesis is controlled by a repressor protein which is activated by a corepressor which is

TLS Online TPP Program

#Question id: 4209

#Unit 3. Fundamental Processes

Tryptophan synthesis can be controlled by a process called attenuation in which the levels of tryptophan in the cell control translation by

TLS Online TPP Program

#Question id: 4210

#Unit 3. Fundamental Processes

Which statement is true about the attenuation mechanism of regulation?