Bio quiz May

Which of the following choices does NOT properly pair an organic compound with one of its monomer subunits?

• Monosaccharide – carbohydrate

• Nucleotide – protein

• Fatty acid – lipid

• Amino acid – protein

Which macromolecule is used to build structures like cell walls and quick energy?

• Carbohydrate

• Protein

• Lipid

• Nucleic Acid

Which macromolecule is used to speed up reactions, transport, and build structures?

• Carbohydrate

• Protein

• Lipid

• Nucleic Acid

Lipids, carbohydrates, and DNA all exist in human cells as long molecular chains. Which of the following describes how DNA differs from lipids and carbohydrates?

• Only DNA has carbon atoms.

• Only DNA is found in the cytoplasm.

• Only DNA is needed to create new cells

• Only DNA contains genetic information

Which of the following is not a macromolecule used by cells?

• Proteins

• Carbohydrates

• Lipids

• Monosaccharides

Which statement about enzymes is not correct?

• Enzymes are composed of polypeptide chains.

• Enzymes bind with a reactant (substrate).

• Enzymes are destroyed when they are used and must be synthesized for each reaction

• Enzymes are specific because of their shape and catalyze only certain reactions.

Which section of the graph includes the point at which the enzyme started to denature?

• I

• II

• III

• IV

Which of the following would likely stop an enzyme from functioning correctly?

• Adding more substrate

• Increasing the temperature

• Decreasing the temperature

• Adding more product

DDT is a pesticide that has been banned in the United States because it contains a chemical that denatures enzymes. When DDT is present, it causes nerves to fire randomly which eventually leads to death. Using what you know about enzymes, which of the following scenarios would occur after exposure to DDT?

• There will be a buildup of substrate.

• There will be a buildup of product.

• There will be a buildup of enzymes

• There will be a buildup of reactions

Sarin gas is a toxic nerve agent. It binds to an enzyme called acetylcholinesterase that is important for proper nerve function. When sarin is present, it causes the shape of the enzyme to change. How would you expect the activity of acetylcholinesterase to change when sarin gas is present?

• Acetylcholinesterase activity will increase.

• Acetylcholinesterase activity will decrease.

• Acetylcholinesterase activity will stay the same.