Question

Which of the following statements about the Lac operon is correct? Group of answer choices The...

Which of the following statements about the Lac operon is correct?

Group of answer choices

The Lac promoter is weak because its sequence deviates significantly from the consensus sequence.

The Lac promoter is weak because it requires cAMP for transcription.

The Lac promoter is strong because its sequence does not deviate greatly from the consensus sequence.

The Lac promoter is strong so it requires a repressor for negative control.

Science   Biology   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

ANSWER :- a.) The lac promoter is weak because it's sequence deviates significantly from the consensus sequence.

A promoter is considered weak or strong based on the affinity for RNA polymerase and the sigma factor. This means the consensus sequence of promoter should match that of the RNA polymerase. If it doesn't exactly match, we can say that the promoter is weak. A weak promoter gives low Transcription and thus low levels of protein product.

The lac promoter is not a particularly strong promoter, and mutations have been obtained that either can increase or decrease its efficiency of initiating Transcription. Base substitution that make the promoter sequence more similar to the consensus generate a stronger promoter whereas those that make the promoter less similar to the consensus generate a weaker promoter.

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
Which of the following statements about regulation of the lac operon is true? Select all that...
Which of the following statements about regulation of the lac operon is true? Select all that apply. Group of answer choices When glucose is present but lactose is absent, gene expression is activated at the lac operon. The presence of glucose in the growth medium does not affect the level of gene expression activated by the presence of lactose. The lac repressor can dissociate from the operator in the presence of glucose. Gene expression is high when the lac repressor...
Which of the following is a protein produced by a regulatory gene near the lac operon?...
Which of the following is a protein produced by a regulatory gene near the lac operon? Group of answer choices Operon Promoter Enhancer Inducer Repressor
1. The lac operon responds to lactose and glucose. If wild-type E. coli cells are grown...
1. The lac operon responds to lactose and glucose. If wild-type E. coli cells are grown in media that contains both lactose and glucose, they will consume the glucose first because: (select all that apply) A.) the lac repressor remains bound to lacO, preventing the lac operon from being expressed at maximal levels B.) the permease (lacY) is not expressed in the presence of glucose, preventing lactose from entering the cell and being converted to allolactose, the inducer C.) the...
Which of the following statements about RNA synthesis in prokaryotes is correct? A. RNA is synthesised...
Which of the following statements about RNA synthesis in prokaryotes is correct? A. RNA is synthesised in one step in prokaryotes. B. The core enzyme of RNA polymerase recognises the transcription initiation site when it binds to the promoter region. C. The Pribnow box is the -35 consensus nucleotide sequence 35 bases downstream from the transcription start site. D. By biochemical convention, regions to the left of the transcription start sites are known as "downstream". E. The nucleotide sequence of...
Which of the following statements about sigma factors is false? Group of answer choices All sigma...
Which of the following statements about sigma factors is false? Group of answer choices All sigma factors recognize the same promoter sequences Sigma factors interact with DNA polymerase prior to forming the closed complex Sigma factors remain bound to the promoter after transcription initiates A and B A and C
6. Which one of the following statements about income is correct? Group of answer choices Income...
6. Which one of the following statements about income is correct? Group of answer choices Income can be in the form of decreases of liabilities. Increases in assets, or decreases in liabilities, that result in increases in equity, other than those relating to contributions from holders of equity claims. Income may arise when there is control over the increase in economic benefits. Income may arise from the recognition of an increase in the value of assets.
Which one of the following statements about income is correct? Group of answer choices Income may...
Which one of the following statements about income is correct? Group of answer choices Income may arise when there is control over the increase in economic benefits. Income may arise from the recognition of an increase in the value of assets. Income can be in the form of decreases of liabilities. Increases in assets, or decreases in liabilities, that result in increases in equity, other than those relating to contributions from holders of equity claims.
Which of the following statements is not correct? Group of answer choices The binomial option pricing...
Which of the following statements is not correct? Group of answer choices The binomial option pricing model when taken to the limit becomes the Black-Scholes option pricing model. The Black-Scholes model uses a continuous time discount factor. The binomial option pricing model use a ratio of the range values as the hedge ratio. The Black-Scholes model is related to a heat transfer equation and Brownian molecular motion. The Black Scholes model only estimates the intrinsic value of the call option....
1. Which of the following is true about binary fission? Group of answer choices A the...
1. Which of the following is true about binary fission? Group of answer choices A the original two chromosomes in a bacterial cell each replicate and are placed into two new cells B the chromosome is copied, then attaches to the cell membrane by spindle fibers C there is no nuclear membrane to break down and reform D lysis of the existing cell wall of bacteria occurs during the process 2. DNA:   Group of answer choices A replication is described...
Which of the following statements is CORRECT? Group of answer choices The risk that cashflows will...
Which of the following statements is CORRECT? Group of answer choices The risk that cashflows will have to be reinvested in the future at lower rates, pushes investors to require higher rates from shorter term bonds, compared to similar longer term bonds. The longer the time to maturity, the greater the change in the value of a bond in response to a given change in interest rates. All of the above are correct. None of the above is correct.
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT