Biochemistry Exam

Which substance is an inorganic molecule, since it lacks BOTH carbon and hydrogen?

• glucose
• lipid
• water
• DNA

What molecule in the chart can be classified as organic, since it contains BOTH Carbon and Hydrogen?

• A
• B
• C
• D

Which substance is small enough to enter a cell by diffusion through the cell membrane?

• water
• starch
• protein
• lipid

In the diagram below, count the number of each molecule inside and outside of the cell. What would most likely happen regarding diffusion after a period of time?

• Carbon Dioxide would diffuse into the cell
• Oxygen would diffuse into the cell
• Carbon Dioxide would remain the same both in and outside the cell
• Oxygen would diffuse out of the cell

Molecules A and B come in contact with a cell membrane. Molecule A can pass through because it is small but Molecule B cannot because it is too large. Which statement below correctly describes Molecules A and B?

• Molecule A is a protein and Molecule B is a lipid
• Molecule A is a starch and Molecule B is a simple sugar
• Molecule A is an amino acid and Molecule B is a simple sugar
• Molecule A is a simple sugar and Molecule B is a starch

In the diagram below, which statement correctly describes the direction of diffusion across the cell membrane?

• Glucose will diffuse into the cell
• Protein will diffuse out of the cell
• Carbon dioxide will diffuse out of the cell
• Oxygen will diffuse into the cell

In the graph below, what is the optimal pH for the rate of enzyme action?

• between 8 and 10
• between 11-13
• between 1-3
• at a neutral pH of 7

Which statement correctly describes the breakdown of proteins?

• a specific enzyme break proteins down into amino acids
• a specific enzyme break proteins down into simple sugars
• a specific enzyme break proteins down into fatty acids
• a specific enzyme break proteins down into starches

In the digestive diagram below, a "catalyst" breaks down a double sugar into two simple sugars. Which statement of terms correctly identifies the "CATALYST?"

• DNA and nucleic acid
• RNA and nucleic acid
• enzyme and carbohydrate
• enzyme and protein

In the digestive diagram below, which statement of terms correctly identifies the beginning "double sugar" and the end "simple sugars?"

• lipid and fatty acids
• disaccharide and monosaccharides
• nucleic acid and nucleotides
• starch and disaccharides