You are studying regulation of the yeast enzyme glutamine synthetase (GS), which is encoded by the GLN1 gene. You have isolated two mutants, designated gln2– and gln3–, that give decreased GS activity. Mating of either gln2– or gln3– haploids to wild type produces heterozygous diploids that show normal amounts of GS expression. When you cross either a gln2– or gln3– haploid to a gln1– strain the resulting diploids show normal expression of GS.              

How many units of ß-galactiosidase would you expect to be expressed from deletion 1 in a gln2– mutant? 

TLS Online TPP Program

#Question id: 228

#Unit 1. Molecules and their Interaction Relevant to Biology

What is the prosthetic group of the retinal vision protein rhodopsin?

TLS Online TPP Program

#Question id: 14977

#Unit 2. Cellular Organization

Careful electron microscopic studies often have shown the nucleoids are present in contact. Thus bacterial DNA is attached to

TLS Online TPP Program

#Question id: 2692

#Unit 2. Cellular Organization

 With respect to microsatellite DNA which of the following is correct?

TLS Online TPP Program

#Question id: 2124

#Unit 2. Cellular Organization

An integral membrane protein can be extracted with:

TLS Online TPP Program

#Question id: 12094

#Unit 10. Ecological Principles

Which of the following plant groups is now extinct?