- 1(current)
Q. No.Gene regulation governing lactose operon of E. coli that involves the lac I gene products is:
| 1. | positive and inducible because it can be induced by lactose. |
| 2. | negative and inducible because repress or protein prevents transcription. |
| 3. | negative and repressible because repress or protein prevents transcription. |
| 4. | feedback inhibition because excess of β galactosidase can switch off transcription. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich enzyme(s) will be produced in a cell in which there is a non-sense mutation in the lac Y gene?
| 1. | Lactose permease |
| 2. | Transacetylase |
| 3. | Lactose permease and transacetylase |
| 4. | β - galactosidase |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology1. usually not expressed unless a signal turns them "on"
2. usually expressed unless a signal turns them "off"
3. never expressed
4. always expressed
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyRead the following four statements (A-D):
| A. | In transcription, adenosine pairs with uracil |
| B. | Regulation of lac operon by a repressor is referred to as positive regulation |
| C. | The human genome has approximately 50,000 genes |
| D. | Haemophilia is a sex-linked recessive disease |
How many of the above statements are right?
1. Three
2. Four
3. One
4. Two
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologySelect the two correct statements out of the four (a-d) given below about lac operon:
| a: | Glucose or galactose may bind with the repressor and inactivate it. |
| b: | In the absence of lactose, the repressor binds with the operator region. |
| c: | The z-gene codes for permease. |
| d: | It was explained by Francois Jacob and Jacque Monod. |
The correct statements are:
| 1. | (b) and (c) |
| 2. | (a) and (c) |
| 3. | (b) and (d) |
| 4. | (a) and (b) |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe lac Operon consists of:
| 1. | One regulatory gene and three structural genes |
| 2. | Two regulatory genes and two structural genes |
| 3. | Three regulatory genes and three structure genes |
| 4. | Four regulatory genes only |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology- 1(current)
Q. No.
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