A mutation of the proteolytic enzyme Trypsin (described in Section 6.1) results in a stable covalent bond between one of the cat
alytic amino acids of the protease and its protein substrate. Which of the following are probably true? a. The enzyme would become inactive.
b. The enzyme and substrate would be stuck together.
c. The delta-G of the proteolysis reaction would change.
d. The rate of the catalyzed reaction would increase.
b. The enzyme and substrate would be stuck together.
Explanation:
Enzymes are proteins whose active site binds to specific chemical reactants (i.e., substrates), thereby forming a complex that is similar to the interaction between a lock and its key. This active complex lowers the energy of the reaction and promotes a conformational change in the substrate to break down it into multiple products. When the enzyme contains mutations in its active site, the ability to bind the substrate is altered. In this case, the enzymatic reaction can't occur because the interaction enzyme-substrate doesn't produce an active complex.
During active transport, substances move against the concentration gradient, from an area of low concentration to an area of high concentration. This process is “active” because it requires the use of energy (usually in the form of ATP).
Cow’s milk contains low quantity
of some vitamins such as vitamin C, D and A than human breast milk. Also, Cow's
milk contains high amount of protein, and low amount of carbohydrates. One of
the proteins present in cow's milk is difficult for infants to digest and may
cause an allergic response making cow’s milk unsuitable for infants.
