Where are the stem cells that renew the epithelium of the gut found?

TLS Online TPP Program

#Question id: 14287

#SCPH05 I Biotechnology

A chemostat is run with a feed rate of llitre/h when the volume of the reactor is also 1 litre. At steady state the doubling time of the cells in the chemostat is.....   h. 

TLS Online TPP Program

#Question id: 23256

#SCPH06 I Botany

Which chromosome pair has same centromeric sequence?

TLS Online TPP Program

#Question id: 11132

#SCPH28 | Zoology

The sensation of temperature is signaled mainly by warm and cold receptors whose sensory fibers travel in association with the sensory fibers carrying pain signals. Which of the following statements best characterizes the transmission of signals from warm receptors?

TLS Online TPP Program

#Question id: 1409

#SCPH05 I Biotechnology

Which DNA repair system is affected in patients with xeroderma pigmentosum?

TLS Online TPP Program

#Question id: 15653

#SCPH06 I Botany

You are studying a new strain of E. coli that can utilize the disaccharide melibiose very efficiently. You find that utilization depends on the enzyme melibiase, which is encoded by the gene Mel1. Mel1 is not expressed unless melibiose is present in the growth medium. You have isolated a mutation that causes constitutive melibiase activity, which you designate MelA–. P1 phage mapping experiments using a Tn5 insertion linked to Mel1 show that MelA– is not linked to Mel1. Moreover you find that when an amber suppressor is introduced into a MelA– mutant, normal melibiase regulation is restored. Classify the MelA– mutation on the basis of genetic properties,  make a proposal for the type of regulatory functions affected by the MelA– mutation?