What is the function of cAMP in regulation of the lac operon? 1. activates a rep
ID: 99228 • Letter: W
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What is the function of cAMP in regulation of the lac operon? 1. activates a repressor protein 2. activates an activator protein 3. inactivates a repressor protein 4. inactivates an activator protein Consider a bacterial strain that has a mutant lac repressor that cannot bind the lac operator region. This strain likely 1. synthesizes lactose. 2. displays inducible expression of the lac operon. 3. displays constitutive expression of the lac operon. 4. does not catabolize lactose. Use the following diagram of the lac I gene and lac operon for questions 5 and 6. (I = lac repressor gene: Z, Y, A = lac operon structural genes: P = lac promoter: O = lac operator) Where would the lac repressor be bound in a (nonmutant) E. coli cell that is growing in low glucose and high lactose? 1. P 2. O 3. P and O 4. the repressor would not be bound Which parts of the DNA region shown in the diagram encode proteins? 1. P 2. P, O, Z, Y, A 3. I, Z, Y, A 4. I, P, O, Z, Y, A A type of DNA sequence in eukaryotes that helps to regulate transcription, may be tissue specific, and may exert control over a gene that is a great distance away is called 1. a promoter. 2. a Shine-Dalgarno sequence. 3. a TATA box. 4. an enhancer. Which statement about RNA splicing in eukaryotes is true? 1. splicing does not represent a potential level of regulation of gene expression. 2. splicing occurs in the cytoplasm. 3. every RNA molecule produced in a eukaryotic cell undergoes splicing. 4. the same transcript may be spliced in different ways to ultimately yield different translation products.Explanation / Answer
Q. 1 Correct Answer is 2 cAMP active the catabolite Activator Protein (CAP) and it activates the transcription of the operon. Option 4 is opposite to option 2 so is incorrect. option 1 is lac repressor protein bind to operator and block RNA polymearse and c AMP have no role in that.
Q2 correct ans is 3 because mutant lac repressor can not bind the lac operator region due to that RNA polymerase is active and allow the constitutive expression of lac operon.
Q3 correct Ans is 4 because due to high lactose its bind with lac repressor and lac repressor would not bind.and RNA polymerase can now transcribe the operon.
Q4 correct ans is 2 because I is Initial site.
Q 5 correct Ans is 3 A TATA box is regulating in Eukaryotes while 2 option Shine Dalgarno sequences present is Prokaryotes and other option 1 and 4 are relative to DNA sequence and not to regulation, there function is different.
Q6 correct answer is 3 because every RNa molecule undergo in splicing
1 is wrong because RNA Splciing is regulating the gene expression
the option 2 is in correct beacause RNA splicing occur in Nucleus, not in cytoplasm
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