BackGeneral Biology: Amino Acids, Glucose, and Biological Processes
Study Guide - Smart Notes
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Amino Acids
Definition and Importance
Amino acids are organic compounds that serve as the building blocks of proteins, which are essential for the structure and function of all living cells.
Key Point 1: Each amino acid contains an amino group (-NH2), a carboxyl group (-COOH), and a unique side chain (R group).
Key Point 2: Amino acids are linked together by peptide bonds to form polypeptides and proteins.
Example: Glycine is the simplest amino acid, with a hydrogen atom as its side chain.
Additional info: There are 20 standard amino acids found in proteins, each with distinct properties that affect protein structure and function.
Glucose and Food
Role of Glucose in Biological Systems
Glucose is a simple sugar (monosaccharide) that serves as a primary energy source for cells.
Key Point 1: Glucose is produced by plants during photosynthesis and is consumed by animals for energy.
Key Point 2: In cellular respiration, glucose is broken down to release energy in the form of ATP.
Example: The equation for cellular respiration is:
Additional info: Glucose can be stored as glycogen in animals or as starch in plants for later use.
Protein Synthesis and Peptide Bonds
Formation of Proteins
Proteins are synthesized by linking amino acids through peptide bonds in a process called translation.
Key Point 1: The sequence of amino acids determines the protein's structure and function.
Key Point 2: Peptide bonds are formed by dehydration synthesis, where a water molecule is removed.
Example: The formation of a peptide bond between two amino acids:
Additional info: Enzymes called ribosomes facilitate the assembly of amino acids into polypeptides during translation.
Enzymes and Biological Catalysis
Function of Enzymes
Enzymes are biological catalysts that speed up chemical reactions in living organisms without being consumed in the process.
Key Point 1: Enzymes lower the activation energy required for reactions.
Key Point 2: Each enzyme is specific to a particular substrate.
Example: Amylase is an enzyme that breaks down starch into glucose.
Additional info: Enzyme activity can be affected by temperature, pH, and the presence of inhibitors or activators.
Classification Table: Amino Acids and Their Properties
Comparison of Amino Acid Types
The following table classifies amino acids based on the properties of their side chains.
Amino Acid | Side Chain Type | Example |
|---|---|---|
Glycine | Nonpolar | H (hydrogen) |
Serine | Polar | CH2OH |
Glutamic Acid | Acidic | CH2CH2COOH |
Lysine | Basic | (CH2)4NH2 |
Additional info: … | Other types include aromatic and sulfur-containing side chains. | Phenylalanine, Cysteine |
