Microbiology: Match the term in the correct sentence. The terms are in BOLD. (Of
ID: 169895 • Letter: M
Question
Microbiology: Match the term in the correct sentence. The terms are in BOLD. (Of my answers below I have 4 wrong, and only one submission left for a grade, Help!) Just tell me which numbers are wrong.
1. An REPRESSOR controls the expression of functionally related genes and consists of a control region and structural genes.
2. If the repressor is not bound to the operator, the RNA polymerase WILL transcribe the structeral genes.
3. REPRESSION decreases expression of the structural genes. This typically occures in response to an OVERABUNDANCE of a substrate.
4. INDUCTION increases expression of the structural genes. This typically occures in response to the PRESENCE of a substrate.
5. The OPERATOR operates differently depending on whether the operon is inducible or not.
6. The CONTROL REGION controls whether RNA polymerase can advance along the DNA strand or not.
7. If the REPRESSOR is bound to the operator, then RNA polymerase WILL NOT transcribe the structural genes.
8. The OPERON contains a promoter and an operator.
9. The PROMOTER is the region of DNA where RNA polymerase initially binds.
Explanation / Answer
Lac operon or a lactose operon is a group of genes which can be transcribed at the same time .lac operon is foun in the prokaryotic cells and are responsible for the Biological processes.
Lac operon contains operator , promoter and a repressor regions. so point number 8 is correct.
Promoter is the region of the DNA where operator binds. so point 9 is correct
Repressor is a DNA or RNA binding protein that inhibits the expression of one or more genes by binding to the operator. So point 7 is also correct.
If the repressor is not bound to the operator, the RNA Polymerase will transcribe the structural genes, so point 2 is correct.
induction occurs in response to the presence of a substrate and consequently increases the expression of genes. so point 4 is correct.
the operator operates depending on wether the operon is inducible or not, so point 5 is correct.
The control regions also called operator, controls wether RNA polymerase can advance along the DNA strand or not. so point 6 is correct.
Repression is the decrease in the expression of structural genes . This typically occurs in response to the overabundance of an end product but not the substrate , so point 3 is wrong.
An operon controls the expression of a functionally related genes and consists of a control region and a structural genes so point 1 is wrong.
so totally from the above question, points 1 and 3 are wrong.