Question 1

Which of the following best describes the primary objective of the course 'Bioquímica de la Célula' as outlined in the syllabus?

Accepted Answer

To present a holistic understanding of the fundamental concepts related to molecules and interactions required to maintain cellular homeostasis.

Question 2

Which of the following is NOT a major macromolecule discussed in the course according to the syllabus?

Accepted Answer

Vitamins

Question 3

A student is analyzing the effect of pH on enzyme activity. Which concept from the course is most directly relevant to this experiment?

Accepted Answer

The role of buffers in maintaining pH

Question 4

Which equation would you use to calculate the pH of a buffer solution containing a weak acid and its conjugate base?

Accepted Answer

$$pH = pK_a + \log_{10}\left(\frac{[A^-]}{[HA]}\right)$$

Question 5

Which of the following best explains why the tertiary structure of a protein is crucial for its function?

Accepted Answer

It allows the protein to interact specifically with other molecules through its three-dimensional shape.

Question 6

A mutation causes a change in the primary structure of a protein. Which level(s) of protein structure could be affected as a result?

Accepted Answer

Primary, secondary, tertiary, and quaternary structures

Question 7

Which of the following statements about enzyme catalysis is correct?

Accepted Answer

Enzymes lower the activation energy, increasing the reaction rate.

Question 8

Which formula would you use to describe the initial velocity ($$v_0) of an $$enzyme-catalyzed reaction according to Michaelis-Menten kinetics?

Accepted Answer

$$v_0$$ = \frac{V_{max}[S]}{K_m + [S]}$$

Question 9

Which of the following best describes the role of the citric acid cycle in cellular metabolism?

Accepted Answer

It oxidizes acetyl-CoA to CO$$_2$$ and generates NADH and FADH$$_2$$ for the electron transport chain.

Question 10

A patient is diagnosed with a defect in oxidative phosphorylation. Which cellular process is most likely to be directly impaired?

Accepted Answer

The production of ATP from NADH and FADH$$_2$$ via the electron transport chain

Question 11

Which of the following is a correct statement about the structure of biological membranes?

Accepted Answer

They are dynamic structures containing lipids, proteins, and carbohydrates.

Question 12

Which intermolecular force is primarily responsible for the secondary structure of proteins such as alpha helices and beta sheets?

Accepted Answer

Hydrogen bonds

Question 13

Which experimental technique would be most appropriate for determining the three-dimensional structure of a protein at atomic resolution?

Accepted Answer

X-ray crystallography

Question 14

Which of the following best describes the main function of carbohydrates in cellular metabolism?

Accepted Answer

They are the main source of energy and provide structural support.

Question 15

Which of the following equations correctly represents the Gibbs free energy change ($$\Delta G) $$for a biochemical reaction?

Accepted Answer

$$\Delta G = \Delta H - T\Delta S$$

Question 16

A researcher isolates a new enzyme and determines its $$K_m$$ value for a substrate. What does a low $$K_m$$ indicate about the enzyme's affinity for the substrate?

Accepted Answer

The enzyme has a high affinity for the substrate.

Question 17

Which of the following best explains why fatty acids yield more ATP per carbon than carbohydrates during catabolism?

Accepted Answer

Fatty acids are more reduced and thus release more energy upon oxidation.

Question 18

Which process is responsible for the synthesis of glucose from non-carbohydrate precursors?

Accepted Answer

Gluconeogenesis

Question 19

A patient presents with lactic acidosis after intense exercise. Which metabolic pathway is primarily responsible for the accumulation of lactate?

Accepted Answer

Anaerobic glycolysis

Syllabus and Study Guide: Cellular Biochemistry (BIOL 4545) – Universidad de Puerto Rico

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