Multiple Choice
Based on the information you know about the trp operon, is the creation of tryptophan expensive to the cell?
16. Regulation of Expression
The Trp Operon
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
The trp operon consists of ________ genes that encode tryptophan biosynthesis enzymes.
A
One.
B
Two.
C
Three.
D
Four.
E
Five.
Verified step by step guidance1
Understand the concept of an operon: An operon is a functioning unit of genomic DNA containing a cluster of genes under the control of a single promoter. These genes are transcribed together into a single mRNA strand and are usually involved in a common metabolic pathway.
Learn about the trp operon: The trp operon is a group of genes that are used to produce the amino acid tryptophan in bacteria, such as E. coli. It is a classic example of a repressible operon, which means it can be turned off by the presence of tryptophan.
Identify the components of the trp operon: The trp operon includes a promoter, an operator, and five structural genes. These genes are labeled trpE, trpD, trpC, trpB, and trpA, each encoding enzymes necessary for the biosynthesis of tryptophan.
Recognize the function of each gene: Each of the five genes in the trp operon encodes a specific enzyme that catalyzes a step in the tryptophan biosynthesis pathway. Together, these enzymes convert chorismate to tryptophan.
Conclude the number of genes: Based on the structure of the trp operon, it consists of five genes that encode the enzymes required for the biosynthesis of tryptophan.
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