Question

QUESTION 1 AGº for the hydrolysis of ATP is considered to be: O highly endergonic O highly exergonic O slightly endergonic O slightly exergonic

Answer 1

Answer 1: The Correct answer is option 'B' i.e. highly exergonic. Exergonic reactions are those reactions during which energy is released when reactants are converted into products. When ATP is hydrolysed into ADP and pyrophosphate, energy is released in large amount, nearly 13.1 KJ/mol is released. So, it is considered to be highly exergonic process.

Answer 2: Second messengers are intracellular signalling molecules released by cells in response to exposure to extracellular molecules which helps in signal transduction. One such molecule is Ca^{​​​​​2+} ion.

So, the correcy answer is option '2'.

Answer 3: Number 4 in graph given indicates the free energy of products, i.e., option '5'.

Answer 4: Among given statement, the correct one for the inhibition of GPCR pathway is '3', i.e., by inhibiting a protein kinase we can inhibit further signal transduction because if phosphorylation will not occur, the protein will not become active and the pathway will get inhibited.

Answer 5: The given statement is true, i.e., if ∆S is greater than 0 , the reaction is definitely exergonic. As per the equation: ∆G= ∆H-T∆S , if ∆S is greater than 0 , then ∆G will also be in more negative and thus the reaction will be exergonic.