Almost all cells contain the enzyme “inorganic pyrophosphatase” which catalyzes

Question

Almost all cells contain the enzyme “inorganic pyrophosphatase” which catalyzes the hydrolysis of PPi to Pi with a G of -7. What possible effect does the presence of this enzyme have on the synthesis of acetyl-CoA?

A.) None

B.) The Pi produced will phosphorylate ADP to from ATP with a large –G.

C.) PPi phosphorylates AMP to make thus driving the reaction by Le Chetelier’s principle.

D.) Since the reaction is unfavored, it will prevent the previous reaction from going too fast.

E.) By the favorable removal of product it helps the previous unfavored reaction to proceed

Intraspecific measurements of estimated SMR in lower vertebrates made in the same laboratory may vary as much as 10-fold between individuals of the same size at the same temperature. What accounts for this degree of variation in oxygen consumption?

A.) This is entirely due to experimental error, evidence suggests that same species, same-sized animals always have the same metabolic rate

B.) Since clones have the same metabolic rate and sibs vary, its entirely due to genetic variation

C.) Since Sibs have the same metabolic rate and clones raised in different environments vary, it’s entirely due to being raised in different environments

D.) Since both sibs raised in the same environment and clones raised in different environments vary, it’s due to a combination of genetic and environmental factors.

E.) None of the above

Which of the following best accounts for the magnitude of the specific dynamic action term of metabolic expenditure in an energy balance equation?
a.)   The time of fat that the animal took the meal.
b.)   The size of the meal and the protein of the meal.
c.)   How much energy was expended in catching/procuring the meal.
d.)   The lipid content of the meal.

Explanation / Answer

answer for the first question ;

Option E , the inorganic phosphate reaction is higly exergonic where converstion of one molecule of the pyrophosphate to two phospates therefore it can be coupled to the unfavorable biochemichal reactions

answer for the 2;

option D , it may be different as they have combination of genetic and envinormental factors as all others constanats like temperature constant

answer for 3;

option B ; size of the meal and the protein of the meal

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