Biology and Cellular Processes Quiz

The surface of a peripheral membrane protein would be best described as:

• hydrophobic

• hydrophilic

• amphipathic

• completely covered by the phospholipids

Identify which of these is not a product of cellular respiration:

• C6H12O6

• ATP

• H2O

• CO2

Approximately how many molecules of ATP are produced from the complete oxidation of two molecules of glucose (C6H12O6) in cellular respiration?

• 2

• 4

• 38

• 76

How does a non-competitive inhibitor decrease the rate of an enzyme reaction?

• by binding at the active site of the enzyme

• by changing the structure of the enzyme

• by acting as a coenzyme for the reaction

• by decreasing the activation energy of the reaction

During oxidative phosphorylation, H2O is formed. Where does the oxygen for the synthesis of the water come from?

• molecular oxygen, O2

• glucose, C6H12O6

• carbon dioxide, CO2

• pyruvate, C3H3O3-

Reactants capable of interacting to form products in a chemical reaction must first overcome a thermodynamic barrier known as the reaction's:

• enthalpy

• activation energy

• heat content

• endothermic level

What kinds of molecules pass through a cell membrane most easily?

• large and hydrophobic

• small and hydrophilic

• very polar

• monosaccharides (such as glucose)

A cell whose cytoplasm has a concentration of 0.02 molar glucose is placed in a test tube of water containing 0.02 molar glucose. Assuming that glucose is not actively transported into the cell, which of the following terms describes the tonicity of the external solution relative to the cytoplasm of the cell?

• isotonic

• hypertonic

• hypotonic

• turgor pressure

Which of the following is most similar in structure to ATP?

• an anabolic steroid

• an amino acid

• a phospholipid

• an RNA nucleotide

According to the second law of thermodynamics, which of the following statements is correct?

• Earth is an open system.

• A living cell can never function as a closed system.

• Every chemical reaction in a cell results in a loss of available energy.

• The synthesis of large molecules from small molecules is endergonic.