Assertion (A) : In an operon, the regulator and operator genes are notassociated with the constitutive genes.Reason (R) : Constitutive genes need not be repressed.(a) Both Assertion (A) and Reason (R) are true and Reason (R) is thecorrect explanation of the Assertion (A).(b) Both Assertion (A) and Reason (R) are true, but Reason (R) is notthe correct explanation of the Assertion (A).(c) Assertion (A) is true, but Reason (R) is false.(d) Assertion (A) is false, but Reason (R) is true. aA bB cC dD
Question
Assertion (A) : In an operon, the regulator and operator genes are notassociated with the constitutive genes.Reason (R) : Constitutive genes need not be repressed.(a) Both Assertion (A) and Reason (R) are true and Reason (R) is thecorrect explanation of the Assertion (A).(b) Both Assertion (A) and Reason (R) are true, but Reason (R) is notthe correct explanation of the Assertion (A).(c) Assertion (A) is true, but Reason (R) is false.(d) Assertion (A) is false, but Reason (R) is true. aA bB cC dD
Solution
The correct answer is (b). Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
In an operon, the regulator and operator genes are indeed not associated with the constitutive genes. This is because the regulator gene produces a repressor protein that can bind to the operator gene and prevent transcription of the structural genes. The operator gene is a segment of DNA to which the repressor binds. It is located 'downstream' of the promoter gene and 'upstream' of the structural genes.
On the other hand, constitutive genes are genes that are always active, or 'on'. They are not regulated and do not need to be repressed. However, this is not the reason why the regulator and operator genes are not associated with the constitutive genes. The lack of association is due to the specific roles and locations of these genes in the operon, not the fact that constitutive genes do not need to be repressed.
Similar Questions
Assertion (A) : For sequencing, the total DNA from a cell is isolated and converted into random fragments.Reason (R) : DNA is a very long polymer.(a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).(b) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).(c) Assertion (A) is true, but Reason (R) is false.(d) Assertion (A) is false, but Reason (R) is true
Assertion: If the gene for an enzyme has an alteration which makes the enzyme less efficient, the amount of hormone will be less.Reason: Genes control characteristics or traits.Both assertion and reason are true and reason is the correct explanation of the assertionBoth assertion and reason are true but reason is not the correct explanation of the assertionAssertion is true statement but reason is falseAssertion is false but reason is true
Directions: In the following questions, a statement of assertion (A) is followed by astatement of reason (R). Mark the correct choice as:(a) Both assertion (A) and reason (R) are true and reason (R) is the correct explanation ofassertion (A).(b) Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation ofassertion (A).(c) Assertion (A) is true but reason (R) is false.(d) Assertion (A) is false but reason (R) is true.4. Assertion : Cell wall is a non-living part of the cell.Reason : It offers protection, definite shape and support. ( )5. Assertion- A cell of meristem tissue is very active.Reason- Meristem tissue is dividing tissue. ( )6. Assertion: Legumes increases the soil fertility.Reason: Microbes in the root nodules of leguminous plants fix atmospheric nitrogen
Directions : In the following questions, a statementof Assertion (A) is followed by a statement ofReason (R). Mark the correct choice as:(A) Both Assertion (A) and Reason (R) are true,and Reason (R) is the correct explanation ofAssertion (A).(B) Both Assertion (A) and Reason (R) are true,but Reason (R) is not the correct explanation ofAssertion (A).(C) Assertion (A) is true, but Reason (R) is false.(D) Assertion (A) is false, but Reason (R) is true.Q. 1. Assertion (A): Management is a systematic body ofknowledge.Reason (R): Management has its own theory andprinciples that have developed over a period oftim
In each of the questions given below, there are two statements marked as Assertion (A) and Reason (R). Mark your answer as per the codes provided below: Assertion A: For animals physical facility is necessary as well as adequateReasoning R: For human being physical facility is necessary but not adequateBoth A and R are true and R is the correct explanation of A.Both A and R are true but R is not the correct explanation of A.A is true but R is false.A is false but R is true.Both A and R are false.
Upgrade your grade with Knowee
Get personalized homework help. Review tough concepts in more detail, or go deeper into your topic by exploring other relevant questions.