#Question id: 2663
#XL - T Zoology
A ______________ is a collection of clones that, among themselves, contain all the DNA sequences of the organism.
#Question id: 2664
#XL - T Zoology
Which of the following is an example of positive gene regulation?
#Question id: 2665
#XL - T Zoology
A transposon ____________.
#Question id: 2666
#XL - T Zoology
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?
#Question id: 2667
#XL - T Zoology
A regulatory protein that attracts RNA polymerase to its promoter is an example of what type of regulation?
#Question id: 2668
#XL - T Zoology
The toxic shock syndrome toxin is produced by some Salmonella species when there is not sufficient iron present. When iron is present, it prevents transcription of the TSS-toxin gene. Iron therefore serves as __________.