Biology: Metabolism and Nutrients
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Questions and Answers

What is the term for the process by which small molecules are built up into larger ones in an organism?

Anabolic reactions

What is the role of enzymes in metabolic reactions?

To speed up the rate of chemical reactions within cells and remain unchanged

What is the term for a substance in food that is used for growth, repair, or maintaining the body?

Nutrient

What is the characteristic of an enzyme that allows it to work on only one specific substrate?

<p>Specificity</p> Signup and view all the answers

What is the term for molecules that have carbon chains, such as carbohydrates, amino acids, proteins, lipids, and nucleic acids?

<p>Organic compounds</p> Signup and view all the answers

What is the term for the site on an enzyme where the substrate binds?

<p>Active site</p> Signup and view all the answers

How does the induced fit model describe the binding of an enzyme and substrate?

<p>The induced fit model states that when the enzyme and substrate join, they form weak bonds that cause the shape of the enzyme to change, creating complementary shapes.</p> Signup and view all the answers

What happens to the active site of an enzyme when the pH changes?

<p>A change in pH alters the shape of an enzyme's active site.</p> Signup and view all the answers

How does temperature affect enzyme activity?

<p>As temperature increases, enzyme activity increases, but only up to a certain point, after which it rapidly decreases due to denaturation.</p> Signup and view all the answers

What happens to an enzyme when it is denatured?

<p>When an enzyme is denatured, its shape changes, and it is no longer complementary to the shape of the substrate.</p> Signup and view all the answers

How does substrate concentration affect the rate of reaction?

<p>As substrate concentration increases, the rate of reaction increases, until the lack of available enzymes becomes the limiting factor.</p> Signup and view all the answers

What is the primary source of energy in our diet that is broken down during cellular respiration to regenerate ATP?

<p>Glucose (monosaccharides) is the primary source of energy in our diet.</p> Signup and view all the answers

Study Notes

Metabolism

  • Refers to all chemical reactions that occur within cells and organisms
  • Comprises of two types: catabolic and anabolic reactions
  • Catabolic reactions involve breaking down large molecules into smaller ones (e.g. digestion)
  • Anabolic reactions involve building up small molecules into larger ones (e.g. protein synthesis)

Nutrients and Organic Compounds

  • Nutrients are substances in food used for growth, repair, or maintaining the body
  • There are six groups of nutrients: water, carbohydrates, lipids, proteins, minerals, and vitamins
  • Organic compounds are large molecules that contain carbon chains (e.g. carbohydrates, amino acids, proteins, lipids, and nucleic acids)
  • Inorganic compounds are small molecules that are not based on carbon chains (e.g. water, minerals, vitamins)

Enzymes

  • Biological catalysts that speed up chemical reactions within cells without being consumed
  • Made up of protein and are highly specific, with each enzyme only working on a specific substrate
  • Lower the activation energy required for a reaction to occur
  • Lock and Key Model: enzymes have an active site that matches the shape of their substrate
  • Induced Fit Model: the shape of the enzyme changes when it binds to the substrate, creating a complementary shape

Factors Affecting Enzyme Activity

  • pH: enzymes work best at a specific pH value, and changes in pH can alter the shape of the active site
  • Temperature: enzymes work best at a comfortable temperature, and excessive heat can cause denaturation
  • Substrate concentration: a limited concentration of substrate will limit the rate of reaction
  • Enzyme concentration: a limited concentration of enzyme will also limit the rate of reaction

Cellular Respiration

  • Metabolic process that breaks down food (e.g. glucose) to release energy
  • Glucose is the primary source of energy in our diet, although amino acids and fatty acids can also be used
  • ATP (adenosine triphosphate) is the energy currency of the cell, and is regenerated during cellular respiration

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Description

Learn about the chemical reactions of metabolism, including catabolic and anabolic reactions, and the 6 groups of nutrients required for growth and maintenance.

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