MSc Sem2 Class 1 02032024

What are housekeeping genes?

• Genes that control the architectural design of residential structures

• Genes that are not expressed continuously in a cell and responsible for regulating cell cycle progression

• Genes that are expressed continuously in a cell regardless of conditions and help in maintaining constant state

• Genes involved in environmental adaptation of cells and are responsible for tissue-specific function

What is an operon?

• Groups of multiple genes placed under multiple promoters and are transcribed individually

• Groups of multiple genes placed under single promoter and are transcribed together

• Groups of multiple genes placed under multiple promoters and are transcribed together

• Groups of multiple genes placed under single promoter and are transcribed individually

What do you mean by polycistronic gene?

• One gene is transcribed to produce one messenger RNA

• All genes are transcribed together to produce multiple messenger RNA

• All genes are transcribed individually to produce multiple messenger RNA

• All genes are transcribed together to produce one messenger RNA

Choose the correct order of arrangement of genes in lac operon.

• lacI - Operator - Promoter - lacZ - lacY - lacA

• Operator - lacI - Promoter - lacZ - lacY - lacA

• lacI - Operator - Promoter - lacY - lacZ - lacA

• lacI - Operator - Promoter - lacY - lacA - lacZ

What does lac operon code for?

• Metabolize glucose

• Metabolize lactose

• Metabolize galactose

• Metabolize arabinose

What is an allosteric protein?

• Protein to which when another molecule binds on a different site, does not change conformation and leaves the initial site.

• Protein to which when another molecule binds on a different site, changes conformation and leaves the initial site.

• Protein to which when an enzyme binds on a different site, changes conformation and leaves the initial site.

• Protein to which when another molecule binds on a different site, changes conformation and stays bound to the initial site.

What is an inducer in lac operon?

• Glucose

• Alloloactose

• Lactose

• Galactose

Which linkage is changed in allolactose?

• Beta 1-4 to Beta 1-2

• Beta 1-2 to Beta 1-6

• Beta 1-4 to Beta 1-6

• Beta 1-6 to Beta 1-2

How are concentrations of Glucose and cAMP related?

• Increase in Glucose, increases cAMP

• Increase in Glucose, decreases cAMP

• Decrease in Glucose, decreases cAMP

• Increase in Glucose, increases galactose

What are two monomers of lactose?

• glucose, glucose

• glucose, galactose

• galactose, lactose

• glucose, glycose