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TLS Online TPP Program

#Question id: 1530

What are the differences and similarities between the transforming genes of retroviruses and those of DNA tumor viruses?

#Unit 4. Cell Communication and Cell Signaling

  1. The oncoproteins encoded by transducing retroviruses are derived from viral replication, whereas those encoded by DNA viruses are derived from normal cell proteins. Both types of viruses express oncoproteins from integrated genomes.

  2. The oncoproteins encoded by transducing retroviruses are derived from normal cell proteins, whereas those encoded by DNA viruses are required for viral replication. Both types of viruses express oncoproteins from integrated genomes.

  3. There is no difference between the transforming genes of retroviruses and DNA tumor viruses. Both types of viruses express oncoproteins from integrated genomes.

  4. The oncoproteins encoded by transducing retroviruses are derived from normal cell proteins, whereas those encoded by DNA viruses are required for viral replication. There is no similarities in both types of viruses.

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TLS Online TPP Program

#Question id: 19216

#Unit 12. Applied Biology

Agrobacterium respond to which plant phenolic compounds which are excreted by susceptible wounded plants.
1. Toluene
2. Acetosyringone 
3. Hydroxyacetosyringon
Which of the option have incorrect statement?
TLS Online TPP Program

#Question id: 17085

#Unit 12. Applied Biology

Spontaneous cell fusion occurs at a very low rate. Enhanced fusion can be done by 
1. Sendai virus 
2. Polyethylene glycol
3. Ficol
4. Phenol red
Which of the above mentioned can be used for fusion experiments?
TLS Online TPP Program

#Question id: 17076

#Unit 12. Applied Biology

The various advantages of serum-free media could be
1. Improved reproducibility of results from different laboratories
2. Easier downstream processing of products from cultured cells
3. Biassays are free from interference due to serum proteins
4. They permit selective culture of diffrentiated cell types from the heterogeneous cultures
Which of the statements are true?
TLS Online TPP Program

#Question id: 16492

#Unit 12. Applied Biology

Upstream elements on the other hand regulates the activity of gene action are
A. Enhancer sequences
B. Silencer sequences
C. Termination sequences
D. Signal sequences
Mark the option with correct combination
TLS Online TPP Program

#Question id: 16487

#Unit 12. Applied Biology

Few limitations regarding organ culture 
It can be maintained only for a few months
Not suitable for biochemical and molecular analyses
For each study, fresh organ cultures have to be initiated
It denatures very easily
Which of the above statements are correct? 
TLS Online TPP Program

#Question id: 15477

#Unit 12. Applied Biology

Why these metabolites are manufactured by microbial fermentation rather than chemical synthesis