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TLS Online TPP Program

#Question id: 13017

Which of the following statements best describes the effect of climate on biome distribution?

#Unit 10. Ecological Principles
  1. Knowledge of annual temperature and precipitation is sufficient to predict which biome will be found in an area.
  2. Fluctuation of  environmental variables is  not  important if  areas  have  the  same  annual temperature and precipitation means.
  3. It is not only the average climate that is important in determining biome distribution, but also the pattern of climatic variation.
  4. Temperate forests, coniferous forests, and grasslands all have the same mean annual   temperatures and precipitation.
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TLS Online TPP Program

#Question id: 23155

#Unit 13. Methods in Biology

Match the following ions in column I with their relevant dyes column II.

 Column I Column II
 1. K+ a. Fura-2
 2. Ca2+ b. SNARF-1
 3. H+ c. Ion potassium green 
Which of the following options is correct?
TLS Online TPP Program

#Question id: 23152

#Unit 13. Methods in Biology

A fluorescent dye SNARF-1 that is sensitive to H+ concentrations can be used to monitor the cytosolic pH of 
1. Alkaline cells
2. Acidic cells 
3. Dead cells
4. Live cells
Which of the following options are incorrect?
TLS Online TPP Program

#Question id: 23151

#Unit 13. Methods in Biology

If the concentration of Ca2+ is high inside the cell and fura-2 dye is used to map the concentration which of the following conditions will prevail?
1. Fluorescence will decrease
2.  Fluorescence will increase
3. Emission of light at higher wavelength
4. Emission of light at lower wavelength
Which of the following options are correct?
TLS Online TPP Program

#Question id: 23148

#Unit 13. Methods in Biology

There are two proteins A and B to be visualized under fluorescence microscopy. Both of them are excited with same wavelength of light but A emits longer wavelength. Hence we can conclude that 
1. A is denser molecule than B
2. B is denser molecule than A
3. A is lighter molecule than B
4. B is lighter molecule than A
Which of the following option is incorrect?
TLS Online TPP Program

#Question id: 23141

#Unit 13. Methods in Biology

Resolution of a light microscope is 0.42nm at 300 wavelength of light. If the specimen is viewed under oil what is the refractive index?
TLS Online TPP Program

#Question id: 19467

#Unit 13. Methods in Biology

Eosin is an acidic dye which basically binds to which molecules?
1. DNA
2. Carbohydrate
3. Glutamic acid
4. Aspartic acid
5. Asparagine
Which combination of the above options are correct?