When enzyme solutions are heated, there is a progressive loss of catalytic activity over time due to denaturation of the enzyme. A solution of the enzyme hexokinase incubated at 45oC lost 50% of its activity in 12 min, but when incubated at 45oC in the presence of a very large concentration of one of its substrates, it lost only 3% of its activity in 12 min. What is correct explanation

#Question id: 10296

#Unit 6. System Physiology – Plant

Which of the following statements about the oxidative pentose phosphate pathway is incorrect?

#Question id: 10297

#Unit 6. System Physiology – Plant

The following statements are related to pentose phosphate pathway.

a) The first and third steps are oxidations with large, negative standard free-energy changes and are essentially irreversible in the cell

b) NADPH rises and inhibits the first enzyme in the pentose phosphate pathway. As a result, more glucose 6-phosphate is available for glycolysis

c) All the enzymes of the reversible reaction of the pentose phosphate pathway are located in the cytosol

d) The NADPH is used for biosynthetic reactions such as lipid synthesis and nitrogen assimilation in the cytosol

which one of the following combination  of above statements is incorrect?

#Question id: 10298

#Unit 6. System Physiology – Plant

Wernicke-Korsakoff syndrome is more common among people with alcoholism than in the general population, The syndrome can be exacerbated by a mutation in the gene for;

#Question id: 10299

#Unit 6. System Physiology – Plant

The stages of respiration take place within an organelle enclosed by a double membrane, the mitochondrion. Which of the following processes occur only inside the mitochondria?

#Question id: 10300

#Unit 6. System Physiology – Plant

which of the following lipid occur in cells only in the inner mitochondrial membrane is about 15% composition only ;

#Question id: 10301

#Unit 6. System Physiology – Plant

Which one of the following enzyme are not invlved in reduction of NAD+?