Unit 2- Biochemistry Review

Which of the following statements regarding the graph is true?

• Reactant A has more energy at the beginning of the reaction that product C has at the end of the reaction

• The differences between the rates of Reaction 2 and 3 occurs because of a difference in the activation energy of these two reactions

• Product B contains more energy at the end of the reaction than reactant A had at the beginning of the reaction

• Reaction 2 occurs faster than Reaction 3 because Reaction 2 requires more energy than Reaction 3

What is the name of the macromolecule that makes up a majority of the cell membrane?

• carbohydrate

• lipid

• nucleotide

• protein

Answer explanation

It is made mostly of phospholipids!

Plants store glucose in the form of...

• Chitin

• Starch

• Cellulose

• Glycogen

The table shows the results of an experiment done by Jalen and Keegan. Jalen placed hydrogen peroxide on several food samples and recorded the relative amount of fizz each produced. The fizz was produced by oxygen bubble released by the enzyme catalase. Which of these is a valid conclusion from their experiment?

• Raw liver produced the most oxygen bubbles, followed by potato

• Boiled potato and cooked liver produced the most oxygen bubbles

• Cooking food seems to increase the activity of the catalase enzyme

• Plant cells produce more oxygen bubbles than animal cells

Unlike saturated fatty acids, UNSATURATED fatty acids are found mostly in animals fats and oils and ....

• are often covalently bonded to sugars

• contain double covalent bonds in between carbons in the hydrocarbon chain

• contain hydrogen, carbon, nitrogen, and oxygen

• lack a carboxyl group

Which of the statements about the graph shown is true?

• Reaction 3 is slower than Reaction 2

• Reaction 3 probably occurred in the presence of an enzyme

• Reaction 3 is the same as Reaction 1, but faster

• Reaction 3 requires more activation energy than Reaction 2

What would a biochemist call the chaining of many amino acids together?

• a lipid

• a carbohydrate

• a protein

• a nucleic acid

Reducing activation energy...

• requires higher temperatures than those found within cells

• is accomplished by the action of enzymes on reactants

• occurs only when reactants are added quickly to a mixture

• violates the laws of nature

Peptide bonds in proteins can be broken down by the enzyme peptidase. Xavier orders a hamburger and French fries for lunch. He adds cheese and mayonnaise to his hamburger, and then sits down to eat lunch with his friends. Which structure would most likely result from the action of peptidase in Xavier’s small intestine?

• lipid

• glucose

• amino acid

• hydrocarbon

Regard the table showing 4 types of carbohydrates. Which correctly matches the functions of each type of carbohydrate?

• Energy: chitin and glycogen

  Structure: cellulose and starch

• Energy: cellulose and chitin

  Structure: glycogen and starch

• Energy: glycogen and starch

  Structure: chitin and cellulose

• Energy: cellulose and starch

  Structure: glycogen and chitin