Unit 6 Study Guide: Biochemistry of the Digestive System

Flashcards covering the biochemistry of the digestive system, including enzyme kinetics, organ functions, and experimental design principles based on the Unit 6 study guide.

How is activation energy defined?

Activation energy is the minimum amount of energy required to start a chemical reaction.

How do temperature changes affect enzyme activity and reaction rates at the molecular level?

Temperature changes affect the kinetic energy of molecules, which influences the frequency of collisions between enzymes and substrates and can alter the enzymes' functional shape.

Why is maintaining a stable body temperature important for the human body?

Maintaining a stable body temperature is crucial for ensuring that chemical reactions occur at optimal rates and for preventing enzymes from denaturing.

What are the four main functions of the digestive system?

The four main functions are ingestion, digestion, absorption, and elimination.

How do mechanical and chemical digestion work together during the digestive process?

Mechanical digestion physically breaks food into smaller pieces, which increases surface area and allows chemical digestion to break down nutrients more efficiently.

How does an increase in surface area affect the rate of a chemical reaction at the molecular level?

Increasing surface area increases the reaction rate because more reactant particles are exposed and available for collisions to occur.

What are the building blocks of carbohydrates, lipids, and proteins?

The building blocks include monosaccharides for carbohydrates, fatty acids and glycerol for lipids, and amino acids for proteins.

What is the correct path that food takes through the digestive system?

The path is mouth \u2192 esophagus \u2192 stomach \u2192 small intestine \u2192 large intestine \u2192 rectum \u2192 anus.

What specific structures or cells assist digestion in the stomach?

Chief cells and parietal cells are specialized structures in the stomach that facilitate the digestive process.

What is the definition of peristalsis?

Peristalsis is the series of involuntary, wave-like muscle contractions that move food through the digestive tract.

Where does the major absorption of sugars, amino acids, and fatty acids occur?

The major absorption of these nutrients occurs in the small intestine.

Which organs are categorized as accessory organs of the digestive system?

The accessory organs are the salivary glands, liver, gallbladder, and pancreas.

What factors can predict and explain changes in chemical reaction rates?

Reaction rates are affected by temperature, concentration, surface area, pressure, catalysts, enzymes, inhibitors, cofactors, and coenzymes.

Why are all enzymes catalysts, but not all catalysts are enzymes?

Enzymes are a specific category of biological catalysts made of proteins, whereas catalysts include any substance that increases reaction rates, including inorganic materials.

How does substrate shape affect enzyme function?

Substrate shape determines enzyme specificity, as an enzyme's active site is shaped to fit only a specific substrate.

What does it mean to denature an enzyme?

To denature an enzyme means to change its shape to the point where it can no longer function, often caused by extreme temperature or pH levels.

What is the difference between the independent and dependent variables in an experiment?

The independent variable is the factor that is changed or manipulated by the researcher, while the dependent variable is the factor being measured or observed in response.

What is the purpose of a control group in an experiment?

A control group serves as a standard for comparison to the experimental group, as it does not receive the experimental treatment or independent variable change.