Practice Questions

TLS Online TPP Program

#Question id: 23875

One successful form of gene therapy has involved delivery of an allele for the enzyme adenosine deaminase (ADA) to bone marrow cells of a child with SCID, and delivery of these engineered cells back to the bone marrow of the affected child. What is one major reason for the success of this procedure as opposed to many other efforts at gene therapy?

#Unit 13. Methods in Biology

The engineered bone marrow cells from this patient can be used for any other SCID patient.
The ADA introduced allele causes all other ADA-negative cells to die.
The engineered cells, when reintroduced into the patient, find their way back to the bone marrow.
No vector is required to introduce the allele into ADA-negative cells

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TLS Online TPP Program

#Question id: 30109

#Unit 1. Molecules and their Interaction Relevant to Biology

Allopurinol is an inhibitor of xanthine oxidase. Administration of allopurinol to a patient with gout and normal HG-PRT levels would be expected to lead to all of the following EXCEPT:

TLS Online TPP Program

#Question id: 483

#Unit 1. Molecules and their Interaction Relevant to Biology

Glycogen is converted to monosaccharide units by:

TLS Online TPP Program

#Question id: 3732

#Unit 3. Fundamental Processes

Which proteins are responsible for the unwinding of the double-stranded DNA during replication?

TLS Online TPP Program

#Question id: 5583

#Unit 5. Developmental Biology

In mammals, dosage compensation is carried out by:

TLS Online TPP Program

#Question id: 15966

#Unit 12. Applied Biology

Embryo to rescue them from unripe or hybrid seeds which fail to germinate is involved in__