TLS Online TPP Program

#Question id: 9598


In the oxidized state, reaction centre chlorophylls contain an unpaired electron, Molecules with unpaired electrons can often be detected by a magnetic-resonance technique known as

#Unit 6. System Physiology – Plant
  1. X-ray crystallography
  2. electron spin resonance (ESR)
  3. Liquid chromatography
  4. Liquid chromatography-Mass Spectrometry (LC-MS) 
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TLS Online TPP Program

#Question id: 22973

#Unit 7. System Physiology – Animal

Which enzyme converts 25-hydroxycholecalciferol to the active form, 1,25-dihydroxycholecalciferol.

TLS Online TPP Program

#Question id: 7289

#Unit 5. Developmental Biology

The following scheme shows the flowering status of a plant species and the photoperiodism. Which of the following conclusions is most appropriate?

TLS Online TPP Program

#Question id: 12251

#Unit 10. Ecological Principles

A plant produces flowers that are open through the day and the night. An experimenter places pollen on the stigmas of freshly opened flowers and covers them after pollination to prevent natural pollinators from having access to the flowers. When experimental pollination was carried out during the day, 40% of the flowers yielded fruit. When experimental pollination was carried out during the night, 80% of the flowers yielded fruit. However, when flowers were  kept  open  to  natural  pollination  during  the  day  (covered  at  night),  35%  of  flowers  produced  fruit.  20%  of flowers exposed to natural pollination during the night (covered during the day) produced fruit. Which of the following statements is NOT a plausible explanation of these results ?

TLS Online TPP Program

#Question id: 4893

#Unit 8. Inheritance Biology

In tomatoes, tall (D) is dominant over dwarf (d) and smooth fruit (P) is dominant over pubescent fruit (p), which is covered with fine hairs. A farmer has two tall andsmooth tomato plants, which we will call plant A and plant B. The farmer crosses plants A and B with the same dwarf and pubescent plant and obtains the following numbers of progeny

a. The genotypes of both plant A and plant B are DdPp

b. In plant A, Gene D and Gene P link as cis configuration

c. In plant B, Gene D and Gene P link as cis configuration

d. In plant A, Gene D and Gene P link as trans configuration

e. In plant B, Gene D and Gene P link as trans configuration

Which of the following above statement are not correct?

TLS Online TPP Program

#Question id: 10744

#Unit 10. Ecological Principles

Something that triggers a fixed action potential (FAP) is considered to be a(n) _____________.