Biology MCQ on Lac Operon for NEET and Medical Exam 2021
MCQ on Lac Operon: Biology is one of the most important and vital sections in NEET. It includes theories, descriptions, discoveries, diagrams, definitions, explanation of differences and relations. Most of the concepts covered in the NEET syllabus are from the NCERT syllabus of Class 11 & 12. Other related sources make up for the rest of the syllabus.
In this post we are providing you MCQ on Lac Operon, which will be beneficial for you in upcoming NEET, AIIMS, JIPMER, PGIMER, CBSE Board, ICSE Board, Class 12th, 11th.
MCQ on Lac Operon
Q1. Which of these acts as an inducer of the lac operon? (a) Allolactose
a) Allolactose
b) Lactose
c) Glucose
d) Galactose
Q2. Which condition in lac operon facilitates the condition of lac genes being transcribed at high levels ? (a) low glucose, high lactose
a) low glucose, high lactose
b) low glucose, low lactose
c) high glucose, high lactose
d) high glucose, low lactose
Q3. Regulation of the lac operon can be envisioned as regulation of enzyme synthesis by its _______. (d) all of the above
a) lactose
b) substrate
c) carbohydrate
d) all of the above
Q4. Which of the following will be prevented if the activator fastens to the repressor ? (c) Binding of the repressor to the operator
a) Transcription
b) Binding of the RNA polymerase to the promoter
c) Binding of the repressor to the operator
d) Binding of the repressor to the promoter
Q5. Lac operon is an example of _______. (c) both positive and negative regulation
a) only positive regulation
b) only negative regulation
c) both positive and negative regulation
d) sometimes positive sometimes negative
Q6. In Lac-operon, the gene product of LacA gene is _______. (b) Beta-galactoside transacetylase
a) Beta-galactoside permease
b) Beta-galactoside transacetylase
c) Beta-galactosidase
d) Beta-galactoside isomerase
Q7. The sequence of the structural genes in the lac operon is _______. (b) lacZ-lacY-lacA
a) lacA-lacZ-lacY
b) lacZ-lacY-lacA
c) lacZ-lacA-lacY
d) lacA-lacY-lacZ
Q8. The correct option regarding the lac operon in E.coli from the following is _______. (d) lac operon messenger RNA is a polycistronic mRNA
a) Lac operon is switched on in the absence of lactose
b) Lac repressor binds to the lac promoter
c) β-galactosidase is the only enzyme produced in large quantities when lac operon is turned on
d) lac operon messenger RNA is a polycistronic mRNA
Q9. In the presence of lactose, how long does it take for the lac operon to be expressed? (c) as long as lactose is more than glucose concentration
a) when lactose equals glucose concentration
b) when glucose is more than lactose concentration
c) as long as lactose is more than glucose concentration
d) as long as lactose is more than galactose concentration
Q10. Lac Operon will be turned on when _______. (c) Lactose in more than glucose
a) Lactose is less than glucose
b) Lactose is less in the medium
c) Lactose in more than glucose
d) Glucose is enough in the medium
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