TLS Online TPP Program

#Question id: 28987


glucocorticoid secretion is reduced during fetal life and the adrenal medulla is dysplastic due to the deficiency of enzyme, such enzyme is known as____

#Unit 7. System Physiology – Animal
  1. 17α- hydroxylase
  2. 11β- hydroxylase
  3. 21β- hydroxylase
  4. 3β- hydroxysteroid dehydrogenase
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TLS Online TPP Program

#Question id: 4089

#Unit 3. Fundamental Processes

An investigator incubates an unprocessed RNA molecule containing an intron in an extract absent of any protein. Correct splicing of the RNA is observed, but only when guanosine is present. What can the investigator conclude about the RNA molecule?

a. It contains a ribozyme. 

b. Self-splicing has occurred.

c. It contains a group II intron.

d. It contains a group I intron.

TLS Online TPP Program

#Question id: 4090

#Unit 3. Fundamental Processes

Tryptophan synthesis can be controlled by a process called attenuation in which the levels of tryptophan in the cell control translation by

TLS Online TPP Program

#Question id: 4091

#Unit 3. Fundamental Processes

To avoid being degraded by nuclear exonucleases, nascent transcripts, pre-mRNA-processing intermediates, and mature mRNAs in the nucleus must have their ends protected. Which of the following mechanism are present in the cell to protect mRNA from degradation?

I. The 5′ cap is protected because it is bound by a heterodimeric nuclear cap-binding complex (CBC), which protects it from 5′ exonucleases and also functions in export of the mRNA to the cytoplasm.

II. 5’-5’ phosphodiester bond in the cap of mRNA plays crucial role in protection

III. The 3′ end of a nascent transcript lies within the RNA polymerase and is thus inaccessible to exonucleases 

TLS Online TPP Program

#Question id: 4092

#Unit 3. Fundamental Processes

An experimental setup provided the assay for identifying factors that facilitate transcription in the presence of chromatin. A factor called FACT (facilitates chromatin transcription) functions as

TLS Online TPP Program

#Question id: 4093

#Unit 3. Fundamental Processes

Which of the following processes is NOT an example of allosteric regulation? 

TLS Online TPP Program

#Question id: 4094

#Unit 3. Fundamental Processes

The accompanying figure depicts the map of a part of E. coli genome harboring the lac operon.

 lac mRNA would hybridize to which of the following DNA?

1) lac I; 2) lac 0; 3) lac Z; 4) lac Y; 5) lac A