Unit 1: Chemistry of Life

Based on the data, which property of water best explains the observed temperature stability in the beaker?

Which molecular interaction is most directly responsible for the difference in heating rates observed in this experiment?

If the experiment were repeated at a location near the ocean versus a location in the interior of a desert, how would the daily temperature range most likely compare?

Which of the following is a property of water that allows insects such as water striders to walk on its surface?

A polypeptide chain is formed by linking amino acids together. Which type of bond directly connects one amino acid to the next in the primary structure?

A protein is denatured by heating to 95°C. Which level(s) of protein structure are most likely disrupted?

Which of the following elements is found in proteins but NOT in carbohydrates?

A researcher measures the pH of a solution and finds it to be 4. If the pH is raised to 6, how does the hydrogen ion concentration change?

An enzyme functions optimally at pH 2 in the stomach. If this enzyme were placed in the small intestine at pH 8, what would most likely happen?

During a dehydration synthesis reaction between two glucose molecules, which of the following occurs?

Which of the following best describes the relationship between monomers and polymers?

Phospholipids are amphipathic molecules. This property is essential for which cellular function?

At what substrate concentration does the enzyme appear to reach approximately half of its maximum reaction rate?

If a competitive inhibitor is added to the reaction, which change in the data would you expect?

The leveling off of reaction rate at high substrate concentrations is best explained by which of the following?

Which functional group, when added to a molecule, would make the molecule act as an acid in solution?

A researcher discovers a new organic molecule with the empirical formula C₃H₇NO₂. Based on this formula, the molecule is most likely which type of macromolecule monomer?

Cellulose and starch are both polymers of glucose. Which structural difference best explains why humans can digest starch but not cellulose?

A solution has a hydrogen ion concentration of 10⁻⁹ M. What is the pH of this solution?

A tripeptide is formed from three amino acids. How many water molecules are released during its formation?