TLS Online TPP Program

#Question id: 19458


How phase contrast and DIC microscopy are used to image live cells and unstained tissues?

#Part-A Aptitude & General Biotechnology
  1. Take advantage of differences in the contrast and thickness of cellular materials
  2. Take advantage of differences in the refractive index and thickness of cellular materials
  3. Live cells show bioluminiscence
  4. Take advantage of differences in chromosomes
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TLS Online TPP Program

#Question id: 16489

#Part-B Specialized Branches in Biotechnology

The beginning of animal tissue culture can be traced when Arnold showed that 

TLS Online TPP Program

#Question id: 1557

#Part-A Aptitude & General Biotechnology

which one of these antibody can cross placenta?

TLS Online TPP Program

#Question id: 1579

#Part-A Aptitude & General Biotechnology

Function of Vitronectin 

TLS Online TPP Program

#Question id: 3523

#Part-B Specialized Branches in Biotechnology

If the number of heterozygous pairs involved in a particular cross is three, the phenotype ratio obtained in their F2 generation will be-

TLS Online TPP Program

#Question id: 12718

#Part-B Specialized Branches in Biotechnology

primary disruptions could be signaling the plant that a change in environmental conditions has occurred and that it’s time to respond by altering existing pathways or by activating stress-response pathways. At least five different types of stress-sensing mechanisms can be distinguished:

                       

                          COLUMN I

 

 

                              COLUMN II

 

A) Physical sensing

 

 

i) usually results from the detection of by-products that accumulate in cells due to the uncoupling of enzymatic or electron transfer reactions, such as the accumulation of ROS during stress caused by too much light.

 

 

B) Biophysical sensing

 

 

ii) often involves the presence of specialized proteins that have evolved to sense a particular stress; for example, calcium channels that can sense changes in temperature and alter Ca2+ homeostasis.

 

 

C) Metabolic sensing

 

 

iii) refers to modifications of DNA or RNA structure that do not alter genetic sequences, such as the changes in chromatin that occur during temperature stress.

 

 

D) Biochemical sensing

 

 

iv) refers to the mechanical effects of stress on the plant or cell structure, for example, the contraction of the plasma membrane from the cell wall during drought stress.

 

 

E) Epigenetic sensing

 

 

v) might involve changes in protein structure or enzymatic activity, such as the inhibition of different enzymes during heat stress.

 

 

  
Match the correct sequence sensing mechanism during in stress;