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TLS Online TPP Program

#Question id: 7183

Following graphs (A and B) represents establishment of a maternal gradient in Hunchback protein.

                  

which of the following statements are correct according to graphs?

#Unit 5. Developmental Biology
  1. Graph A shows unfertilized egg, in which maternal hunchback mRNA is present at a relatively low level throughout the egg, whereas nanos mRNA is located posteriorly and Graph B shows fertilized egg, in which nanos mRNA is translated and nanos protein blocks translation of hunchback mRNA in the posterior regions, giving rise to a shallow antero-posterior gradient in maternal Hunchback protein.
  2. Graph A shows fertilized egg, in which nanos mRNA is translated and nanos protein blocks translation of hunchback mRNA in the posterior regions, giving rise to a shallow antero-posterior gradient in maternal Hunchback protein and Graph B shows unfertilized egg, in which maternal hunchback mRNA is present at a relatively low level throughout the egg, whereas nanos mRNA is located posteriorly.
  3. Graph A shows unfertilized egg, in which nanos mRNA is translated and nanos protein blocks translation of hunchback mRNA in the posterior regions, giving rise to a shallow antero-posterior gradient in maternal Hunchback protein and Graph B shows fertilized egg, in which maternal hunchback mRNA is present at a relatively low level throughout the egg, whereas nanos mRNA is located posteriorly.
  4. Graph A and B both shows fertilized egg, in which nanos mRNA is translated and hunchback mRNA is untranslated.
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TLS Online TPP Program

#Question id: 71

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following is not the priority rule for R, S Configuration?
TLS Online TPP Program

#Question id: 72

#Unit 1. Molecules and their Interaction Relevant to Biology

For the reaction catalyzed by the enzyme hexokinase: Glucose + ATP → glucose 6-phosphate + ADP the equilibrium constant, Keq, is 7.8 × 102. In living E. coli cells, [ATP] = 5 mM, [ADP] = 0.5 mM, [glucose] = 2 mM, and [glucose 6-phosphate] = 1 mM. Which of the following conclusions made on the basis of the above calculations is incorrect?
TLS Online TPP Program

#Question id: 73

#Unit 1. Molecules and their Interaction Relevant to Biology

Match the Variation of Reaction Spontaneity (Sign of ΔG) given in Column I with the Signs of ΔH and ΔS given in column II.

COLUMN I

COLUMN II

 

 

 

  ΔH

ΔS

ΔG = ΔH – TΔS

1.

−

+

a. The reaction is both enthalpically and entropically opposed. It is nonspontaneous (endergonic) at all temperatures.

2.

 −

− 

b. The reaction is enthalpically opposed (endothermic) but entropically favored. It is spontaneous only at temperatures above T = ΔH/ΔS.

3.

+

+

c. The reaction is enthalpically favored but entropically opposed. It is spontaneous only at temperatures below T = ΔH/ΔS.

4.

+

−

d. The reaction is both enthalpically favored (exothermic) and entropically favored. It is spontaneous (exergonic) at all temperatures.

TLS Online TPP Program

#Question id: 74

#Unit 1. Molecules and their Interaction Relevant to Biology

The enthalpy and entropy of the initial and final states of a reacting system are shown in the table. Calculate the change in free energy for the reaction when the temperature is 4°C.
TLS Online TPP Program

#Question id: 75

#Unit 1. Molecules and their Interaction Relevant to Biology

The experimental approach taken in current biological investigations presumes that ________.
TLS Online TPP Program

#Question id: 76

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following illustrations is not a structural isomer of an organic compound with the molecular formula C6H14? For clarity, only the carbon skeletons are shown; hydrogen atoms that would be attached to the carbons have been omitted.