Which statement is NOT correct about the trp operon?
A. Tryptophan acts as the corepressor.
B. The structural genes make products that are part of an anabolic pathway for the synthesis of tryptophan.
C. Tryptophan binds to the repressor protein and inactivates it.
D. It is normally turned off if tryptophan is present.
Answer: C
You might also like to view...
Which of the following can function in signal transduction in plants?
I) calcium ions II) nonrandom mutations III) receptor proteins IV) autochrome V) secondary messengers A) only I, III, and IV B) only I, II, and V C) only I, III, and V D) only II and IV E) only II, III, and V
Attributes of Welwitschia mirabilis include
_____ It has only two leaves. _____ It obtains most of its water from seasonal heavy rains. _____ It lives under desert conditions. _____ It is a gnetophyte. _____ Its stems are photosynthetic, but its leaves are not.
Phagocytosis is a form of ____
a. diffusion b. endocytosis c. exocytosis d. osmosis e. facilitated diffusion
It is possible to synthesize proteins in vitro (in a test tube) without the use of living cells. If starting from a mature mRNA transcript, which of the following components would not be needed to do this?
A) adenine molecules B) amino acids C) tRNAs D) ribosomes