This chapter explores the crucial biomolecules that compose living organisms, including their structure and functions. Understanding these biomolecules is vital for grasping the complexities of life.
Biomolecules - Quick Look Revision Guide
Your 1-page summary of the most exam-relevant takeaways from Biology.
This compact guide covers 20 must-know concepts from Biomolecules aligned with Class 11 preparation for Biology. Ideal for last-minute revision or daily review.
Complete study summary
Essential formulas, key terms, and important concepts for quick reference and revision.
Key Points
Define biomolecules: key to life.
Biomolecules are organic compounds in living organisms, including proteins, nucleic acids, and carbohydrates.
Water: most abundant biomolecule.
Water constitutes 70-90% of cellular mass and is vital for biochemical reactions.
Macromolecules: large biomolecules.
Macromolecules include proteins, nucleic acids, polysaccharides, with sizes over 10,000 daltons.
Proteins: amino acid polymers.
Proteins consist of 20 amino acids linked by peptide bonds, serving varied functions.
Nucleic acids: genetic information.
DNA and RNA are nucleic acids, composed of nucleotides, crucial for heredity.
Polysaccharides: energy storage.
Starch and glycogen are polysaccharides that store energy; cellulose provides structural support.
Lipids: diverse hydrophobic molecules.
Lipids include fats, oils, and phospholipids, playing roles in energy storage and cell membranes.
Amino acids: building blocks.
Amino acids contain an amino group and a carboxyl group; 20 types exist in proteins.
Enzymes: biological catalysts.
Enzymes, mostly proteins, speed up reactions by lowering activation energy. They are substrate-specific.
Active site: enzymes' functional area.
The active site on an enzyme binds substrate, facilitating conversion to products.
Enzyme activity affected by pH.
Each enzyme has an optimum pH; deviation can lead to denaturation or reduced activity.
Temperature effects on enzymes.
Enzymes are sensitive to temperature changes; high temps may denature them, halting function.
Competitive inhibitors: enzyme blockers.
Inhibitors mimic substrates, competing for the active site, decreasing enzyme activity.
Non-competitive inhibitors: block function.
These inhibitors bind to the enzyme, altering its shape and function, irrespective of substrate.
Primary structure: amino acid sequence.
The primary structure of proteins is the linear sequence of amino acids linked by peptide bonds.
Secondary structure: folding patterns.
Proteins can form alpha-helices or beta-pleated sheets due to hydrogen bonding between amino acids.
Tertiary structure: 3D arrangement.
Tertiary structure is the overall 3D shape, crucial for protein function determined by R group interactions.
Quaternary structure: multiple chains.
It involves the assembly of multiple polypeptide chains into a functional protein complex.
Metabolites: primary vs. secondary.
Primary metabolites are essential for life (like amino acids), while secondary metabolites are role-specific.
Hydrophilic vs. hydrophobic biomolecules.
Hydrophilic molecules interact with water, while hydrophobic ones repel it, affecting biological functions.
Know key examples: enzymes and proteins.
Examples include collagen (structural), insulin (hormonal), and amylase (digestive enzyme) demonstrating diverse roles.
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