A cell does not want to waste energy synthesizing the amino acid arginine if arginine is present in its diet. Therefore, when arginine is present, it activates a repressor protein to prevent transcription of genes that code for enzyme to make arginine. This is an example of what type of regulation?

TLS Online TPP Program

#Question id: 27982

#Unit 1. Molecules and their Interaction Relevant to Biology

Reactions catalyzed by FoF1

a. Perform by mechanism of rotational catalysis 

b.. Gamma rotate 120 degree to contact with beta subunit 

c. Gamma rotate 360 degree to contact with beta subunit 

d. beta rotate 120 degree to contact with Gamma

Which of the following is true

TLS Online TPP Program

#Question id: 1556

#Unit 4. Cell Communication and Cell Signaling

Which one of these is not a property of Antigen?

TLS Online TPP Program

#Question id: 10805

#Unit 6. System Physiology – Plant

Breakdown of cyanogenic glycosides in plants is a two-step enzymatic process, the enzymes necessary to hydrolyze the sugar and liberate HCN is

TLS Online TPP Program

#Question id: 5325

#Unit 8. Inheritance Biology

Cystic fibrosis is caused by a recessive lethal gene and can be detected by an excess concentration of chloride in sweat. A normal man whose sister has cystic fibrosis, his normal wife whose brother has cystic fibrosis. What is chance of cystic fibrosis in their child?

TLS Online TPP Program

#Question id: 5306

#Unit 11. Evolution and Behavior

 If the sequence of a cDNA has matches with DNA sequences in the genome, then this genomic DNA could be described by which of the following statements?