Replication of a bacterial chromosome normally starts at a fixed point called:

TLS Online TPP Program

#Question id: 2162

#SCPH28 | Zoology

Uniport transport

TLS Online TPP Program

#Question id: 10925

#I Life Science/ Life Sciences Group – I-V

During the second trimester of pregnancy, where is the predominant site of red blood cell production?

TLS Online TPP Program

#Question id: 3873

#SCPH28 | Zoology

The excision (splicing) of many group I introns requires, in addition to the primary transcript RNA:

TLS Online TPP Program

#Question id: 16126

#SCPH06 I Botany

2 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, that could explain the effect of the gln2– and gln3– mutations on the regulation of GLN1.

The GLN1 gene shows a rather complex regulation in response to different amino acids. When either glutamate (glu) or glutamine (gln) is added to the medium, the amount of GS expression diminished and when both glutamate and glutamine are added to the medium GS expression is shut off completely. The effects of different mutants on the response to glu and gln are shown below.

TLS Online TPP Program

#Question id: 3892

#SCPH28 | Zoology

The DNA binding motif for many prokaryotic regulatory proteins, such as the lac repressor, is: