Question

Enzymes ______.

a. increase the rate at which the reaction occurs by lowering the activation energy of the reaction

b. decreases the rate at which the reaction occurs by raising the activation energy of the reaction

c. increase the rate at which the reaction occurs by raising the activation energy of the reaction

d. decreases the rate at which the reaction occurs by lowering the activation energy of the reaction

Which of the following components is not contained in all amino acid? a.  amino group b. hydroxyl group c. central carbon (alpha carbon) d. carboxyl group

Saturated fatty acids have _________________ than unsaturated fatty acids, which is why they exist as a ____________ at room temperature.

a. fewer double bonds; solid b. more double bonds; liquid fewer c. double bonds; liquid d . more double bonds; solid

Which of the following is NOT an important biological function of lipids?

a.  immediate energy usage. b. protection of internal organs and tissues. c . regulation of growth and development d. long term energy storage e. formation of cellular membranes

Answer 1

1.Correct answer is : a. increase the rate at which the reaction occurs by lowering the activation energy of the reaction

Reason: Enzymes act as catalysts and function to increase  the rate of reaction by lowerig the activation energy of the reaction.Activation energy is the energy that is to be provided to system to carry out the reaction.

2.Correct answer is b. hydroxyl group

Reason: Serine, threonine and tyrosine have hydroxyl groups and not all aminoacids.

3.Correct answer is:a. fewer double bonds , solid

Reason:Saturated fatty acids have no double bonds and possess more of hydrogen atoms attached to the carbons which is why they are soild at room temperature.

4.Correct answer is : immediate energy usage.

Reason: Lipids are not used as immediate energy usage;rather they are used for long term energy storage.Carbohydrates are used for immediate energy storage.