Unit 1 Most Missed Questions

Amylase is a biocatalyst that hydrolyzes starch into simple sugar molecules in the pancreas. Which best describes amylase?

• Lipid

• Protein

• Carbohydrate

• Nucleic Acid

Helena investigates how enzymes are important to body processes. How is the role of enzymes in biochemical activity BEST explained?

--I did not like this question, I am giving yall credit back on your test and will explain the best answer that isn't on here!--

• Enzymes work at all pH levels

• Enzymes decrease the rate of metabolism

• Enzymes allow reactions to occur at lower temperatures

• Enzymes raise the activation energy needed for a reaction

Which statements explain the primary difference between the structure of a nucleic acid and the structure of a protein?

• A nucleic acid has alternating base pairs. A protein has alternating peptides.

• Nitrogen bases form the backbone of a nucleic acid. Peptides form the backbone of a protein.

• A nucleic acid is held together by the sugar-phosphate complex. A protein is held together by the carbon-carbon bonds.

• Nucleotides link together to form a nucleic acid. Amino acids link together to form a protein.

Peptide bonds in proteins can be broken down by the enzyme peptidase. Adrian 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 Adrian’s small intestine?

• Lipid

• Glucose

• Amino Acid

• Hydrocarbon

Why are proteins among the most diverse molecules?

• They create nucleic acids

• They form muscle in animals

• Amino acids can link up in different combinations

• Amino acids are made up of more than 20 different proteins.

Which type of molecules combine to make up the protein portion of hemoglobin?

• Fatty acids

• Amino acids

• Monosaccharides

• Polysaccharides

Salivary amylase is an enzyme in humans that breaks down starches. What substance would humans have difficulty digesting without this enzyme?

• Carbohydrates

• Lipids

• Proteins

• Nucleic Acids

Salivary amylase is an enzyme in the human body that digests carbohydrates from food. When food mixed with saliva enters the stomach, the action of salivary amylase slows dramatically. Which causes salivary amylase enzyme to stop digesting food?

• The food is mixed more in the mouth than in the stomach.

• The pH of the stomach is lower than in the mouth.

• The concentration of food decreases in the stomach.

• The temperature of the food increases in the stomach.

The enzyme hexokinase binds to glucose and ATP during the chemical reaction. At what location do they connect?

• Active Site

• Between the bases

• At the end of the fatty acids

• The enzyme-substrate complex

All organisms contain DNA and RNA. What are the subunits of DNA and RNA?

• Simple Sugars

• Amino Acids

• Carbohydrates

• Nucleotides