Practice Questions

TLS Online TPP Program

#Question id: 3982

The diagram below represents a hypothetical operon in the bacterium E. coli. The operon consists of two structural genes (A and B) that code for the enzymes A-ase and B-ase, respectively, and also includes P (promoter) and O (operator) regions as shown.

When a certain compound (X) is added to the growth medium of E. coli, the separate enzymes A-ase and B-ase are both synthesized at a 50-fold higher rate than in the absence of X (which has a molecular weight of about 200). Which one of the following statements is true of such an operon?

#Unit 3. Fundamental Processes

Adding X to the growth medium causes a repressor protein to be released from the O region.
Adding X to the growth medium causes a repressor protein to bind tightly to the O region.
Synthesis of the mRNA from this operon is not changed by the addition of compound X.
The mRNA copied from this operon will be covalently linked to a short piece of DNA at the 5' end.

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TLS Online TPP Program

#Question id: 18227

#Unit 8. Inheritance Biology

You are conducting genetic linkage studies of an autosomal dominant disease. You are focused on two SSR markers that may be linked to each other and to the disease. Here is a family in which some individuals are affected:

Calculate LOD scores for linkage at θ = 0.1 between the disease and SSR62

TLS Online TPP Program

#Question id: 18228

#Unit 8. Inheritance Biology

You are conducting genetic linkage studies of an autosomal dominant disease. You are focused on two SSR markers that may be linked to each other and to the disease. Here is a family in which some individuals are affected:

Calculate LOD scores for linkage at θ = 0.1 between the disease and SSR93?

TLS Online TPP Program

#Question id: 18229

#Unit 8. Inheritance Biology

You are conducting genetic linkage studies of an autosomal dominant disease. You are focused on two SSR markers that may be linked to each other and to the disease. Here is a family in which some individuals are affected:

Calculate LOD scores for linkage at θ = 0.1 between SSR62 and SSR93

TLS Online TPP Program

#Question id: 18230

#Unit 13. Methods in Biology

Although PCR and replication show resemblances, but the basic difference is

TLS Online TPP Program

#Question id: 18231

#Unit 13. Methods in Biology

A DNA sample having mass 1 picogram undergoes PCR, the eluted DNA is weighted about 1 microgram, the minimum number of cycles required

TLS Online TPP Program

#Question id: 18368

#Unit 12. Applied Biology

The Phytoremediation system can be used for the treatment of