A molecule binds to the enzyme hexokinase and changes its tertiary structure. Th

Question

A molecule binds to the enzyme hexokinase and changes its tertiary structure. This effect could lead to

a. competitive inhibition

b. competitive excitation

c. allosteric inhibition

d. allosteric activation

e.   either allosteric inhibition or allosteric activation

In which of the following would you expect to find large amounts of chitin?

a. French bread

b. hamburger

c. lettuce

d. bacteria feeding on the three items above

e. cockroaches walking on A, B and C in neighborhood restaurants

Penicillin interrupts the formation of

a. alpha 1,4 glycosidic linkages

b. formation of beta 1,4 glycosidic linkages

c. formation of hydrogen bonds between neighboring sugars bound by beta 1,4 glycosidic linkages

d. bonds between peptidoglycans

e. alpha glucose and beta glucose molecules

Molecule A has a permeability of 10-2 cm/sec in a pure lipid membrane while molecule B is measured to have a permeability of 10-10 cm/sec in the same pure lipid membrane. Which of the following statements is true?

A. both carbohydrates and lipids

B. glycerol groups

C. carbon rings

D. carboxyl and amino groups

E. both hydrophobic and hydrophilic regions

Explanation / Answer

1) Allosteric inhibition - The tertiary structure of the enzyme consists of ATP binding domain. Any changes to the teritiary structure will inhibit this domain. Hexokinase is allosterically inhibited by glucose-6-phosphate when present in higher concentration.

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