Biomolecules Summary
Biomolecules - Summary
Biomolecules are the essential organic molecules found in living organisms
They are classified into four major types
: carbohydrates, proteins, lipids, and nucleic acids
These biomolecules perform various functions and are crucial for the survival and functioning of living organisms
Understanding the structure and properties of biomolecules is important in the study of biochemistry
Let’s take a closer look at each type of biomolecule and discuss their importance and characteristics
Biomolecules Summary
Carbohydrates
Carbohydrates are organic compounds made up of carbon, hydrogen, and oxygen atoms
They are the main source of energy for living organisms
Monosaccharides are the simplest carbohydrates, such as glucose and fructose
Disaccharides, like sucrose and lactose, are formed by joining two monosaccharides together
Polysaccharides, such as starch and cellulose, consist of many monosaccharide units joined together
Biomolecules Summary
Proteins
Proteins are large biomolecules composed of amino acids
They have a wide range of functions, including enzymes, structural components, and transportation
Amino acids are linked together by peptide bonds to form polypeptides
The primary structure of a protein is determined by the sequence of amino acids
Proteins can have complex structures, including secondary, tertiary, and quaternary structures
Biomolecules Summary
Lipids
Lipids are hydrophobic molecules that serve as energy storage and structural components
They are composed of glycerol and fatty acids
Triglycerides are the most common type of lipid, which consist of three fatty acids attached to a glycerol molecule
Phospholipids are a major component of cell membranes
Steroids, such as cholesterol, play important roles in hormone synthesis and cell signaling
Biomolecules Summary
Nucleic Acids
Nucleic acids are biomolecules that store and transmit genetic information
There are two types of nucleic acids
: DNA and RNA
DNA (deoxyribonucleic acid) is the hereditary material in all living organisms
RNA (ribonucleic acid) is involved in protein synthesis and other cellular processes
Nucleic acids are composed of nucleotides, which consist of a phosphate group, a sugar molecule, and a nitrogenous base
Biomolecules Summary
Biomolecules in Cellular Processes
Carbohydrates are broken down in cellular respiration to produce ATP, the main energy currency of cells
Proteins are involved in enzymatic reactions, cell signaling, and structural support
Lipids play a crucial role in maintaining cell membranes and storing energy for long-term use
Nucleic acids store and transmit genetic information necessary for protein synthesis and cellular processes
All these biomolecules work together to ensure the proper functioning of cells and organisms
Biomolecules Summary
Importance of Biomolecules
Biomolecules are the building blocks of life and are essential for the existence of all living organisms
Carbohydrates provide energy, proteins perform various functions, lipids maintain cell structure, and nucleic acids store genetic information
Understanding the properties and functions of biomolecules is crucial in the fields of medicine, genetics, and biochemistry
The study of biomolecules helps in understanding the mechanisms of diseases and developing new treatments
Overall, biomolecules are the foundation of life and play a vital role in maintaining and regulating biological processes
Biomolecules Summary
Summary
Biomolecules are organic compounds found in living organisms
Carbohydrates provide energy, proteins perform functions, lipids maintain structure, and nucleic acids store genetic information
Understanding biomolecules is essential in the fields of medicine, genetics, and biochemistry
The study of biomolecules aids in understanding diseases and developing treatments
Biomolecules are fundamental to life and are involved in various biological processes
Biomolecules Summary
Carbohydrates
Carbohydrates are organic compounds composed of carbon, hydrogen, and oxygen atoms
They are classified into three categories
: monosaccharides, disaccharides, and polysaccharides
Monosaccharides are the simplest carbohydrates and cannot be hydrolyzed further (e.g., glucose, fructose)
Disaccharides are formed by the condensation reaction between two monosaccharides (e.g., sucrose, lactose)
Polysaccharides consist of long chains of monosaccharide units (e.g., starch, cellulose)
Biomolecules Summary
Functions of Carbohydrates
Providing energy
: Carbohydrates are the primary source of energy for living organisms
Energy storage
: Excess glucose is stored as glycogen in animals and as starch in plants
Structural support
: Carbohydrates, like cellulose, provide rigidity to plant cell walls
Cell recognition
: Carbohydrates on cell membranes are involved in cell signaling and recognition
Dietary fiber
: Certain carbohydrates, like cellulose and pectin, are known as dietary fiber and aid in digestion
Biomolecules Summary
Proteins
Proteins are large biomolecules composed of amino acids
Amino acids are connected by peptide bonds to form polypeptide chains
There are 20 different amino acids, each with a unique side chain
Proteins have a diverse range of functions, including enzymatic catalysis, structural support, and transportation
Examples of proteins include enzymes, antibodies, and collagen
Biomolecules Summary
Protein Structure
Primary structure
: The sequence of amino acids in a protein chain
Secondary structure
: Local folding patterns in a protein, including alpha helices and beta sheets
Tertiary structure
: Overall three-dimensional arrangement of the protein
Quaternary structure
: Arrangement of multiple protein subunits, if applicable
Protein structure determines its function and can be influenced by factors like pH and temperature
Biomolecules Summary
Lipids
Lipids are hydrophobic molecules that are insoluble in water
They are composed of glycerol and fatty acids
Triglycerides are the most common type of lipid, consisting of three fatty acid chains attached to a glycerol molecule
Phospholipids are major components of cell membranes
Lipids can function as energy storage molecules and act as signaling molecules (e.g., steroids)
Biomolecules Summary
Types of Lipids
Saturated fatty acids
: No double bonds between carbon atoms, solid at room temperature (e.g., butter)
Unsaturated fatty acids
: Double bonds between carbon atoms, liquid at room temperature (e.g., vegetable oil)
Phospholipids
: Consist of a hydrophilic head and hydrophobic tail, form lipid bilayers in cell membranes
Steroids
: Lipids with a common four-ring structure, involved in hormone synthesis and cell signaling
Biomolecules Summary
Nucleic Acids
Nucleic acids store and transmit genetic information in living organisms
There are two types of nucleic acids
: DNA (deoxyribonucleic acid) and RNA (ribonucleic acid)
Nucleotides are the building blocks of nucleic acids and consist of a phosphate group, a sugar molecule, and a nitrogenous base
DNA contains the genetic code that determines the traits and characteristics of an organism
RNA plays a vital role in protein synthesis and gene expression
Biomolecules Summary
DNA Structure
DNA is a double-stranded helical structure
It consists of two complementary strands held together by hydrogen bonds between nitrogenous bases
The four nitrogenous bases in DNA are adenine (A), thymine (T), cytosine (C), and guanine (G)
The base pairing rules are A-T and C-G
The structure of DNA allows for the precise copying and transmission of genetic information during cell division
Biomolecules Summary
RNA Types
Messenger RNA (mRNA)
: Carries genetic information from DNA to the ribosomes for protein synthesis
Transfer RNA (tRNA)
: Transfers amino acids to the ribosomes based on the mRNA sequence
Ribosomal RNA (rRNA)
: Major component of ribosomes, involved in protein synthesis
RNA can also have regulatory functions, like microRNA (miRNA) involved in gene expression control
Biomolecules Summary
Role of Biomolecules in Cellular Processes
Carbohydrates provide energy for cellular activities through cellular respiration
Proteins function as enzymes, catalysts for chemical reactions in cells
Lipids maintain the integrity of cell membranes and act as an energy source
Nucleic acids store and transmit genetic information necessary for protein synthesis and cell functions
Understanding how biomolecules interact and function in cellular processes is crucial in understanding the complexity of life.
Biomolecules Summary
Classification of Carbohydrates
Carbohydrates are classified into three categories
: monosaccharides, disaccharides, and polysaccharides
Monosaccharides are the simplest carbohydrates and cannot be hydrolyzed further
Examples of monosaccharides include glucose, fructose, and galactose
Disaccharides are formed by the condensation reaction between two monosaccharides
Examples of disaccharides include sucrose, lactose, and maltose
Biomolecules Summary
Polysaccharides
Polysaccharides are long chains of monosaccharide units
Starch is a polysaccharide found in plants and serves as an energy storage molecule
Glycogen is a highly branched polysaccharide found in animals, stored in the liver and muscles
Cellulose is a polysaccharide that forms the structural component of plant cell walls
Chitin is a polysaccharide found in the exoskeletons of arthropods and the cell walls of fungi
Biomolecules Summary
amino acids
Proteins are large biomolecules composed of amino acids
There are 20 different amino acids, each with a unique side chain
Amino acids are linked together by peptide bonds to form polypeptides
The sequence of amino acids determines the primary structure of a protein
The primary structure influences the folding and overall structure of the protein
Biomolecules Summary
Proteins
Proteins have a diverse range of functions in living organisms
Enzymes are proteins that catalyze chemical reactions and regulate metabolism
Antibodies are proteins that recognize and neutralize foreign substances in the body
Structural proteins like collagen provide support to tissues and organs
Transport proteins, such as hemoglobin, carry molecules and ions across cell membranes
Biomolecules Summary
Lipids
Lipids are hydrophobic molecules that are insoluble in water
They play a crucial role in energy storage and cell membrane structure
Triglycerides, composed of glycerol and fatty acids, are the most common type of lipid
Phospholipids have a hydrophilic head and hydrophobic tails, forming bilayers in cell membranes
Steroids, such as cholesterol, are lipids involved in hormone synthesis and cell signaling
Biomolecules Summary
Saturated,Unsaturated, Polyunsaturated fatty acids
Saturated fatty acids have no double bonds between carbon atoms and are solid at room temperature
Examples include butter and animal fats
Unsaturated fatty acids have double bonds between carbon atoms and are liquid at room temperature
Examples include vegetable oils and fish oils
Polyunsaturated fatty acids have multiple double bonds and are beneficial for health
Biomolecules Summary
Steroids
Steroids are lipids with a common four-ring structure
Cholesterol is a type of steroid found in cell membranes and is a precursor for steroid hormone synthesis
Hormones like estrogen, testosterone, and cortisol are derived from cholesterol
Steroids are involved in various physiological processes, including reproductive function and stress response
Biomolecules Summary
Nucleic acids
Nucleic acids store and transmit genetic information in living organisms
DNA (deoxyribonucleic acid) is the hereditary material in all living organisms
DNA is a double-stranded helical structure, formed by complementary base pairing
The four nitrogenous bases in DNA are adenine, thymine, cytosine, and guanine
RNA (ribonucleic acid) is involved in protein synthesis and other cellular processes
Biomolecules Summary
Nucleotides
Nucleotides are the building blocks of nucleic acids
Each nucleotide consists of a phosphate group, a sugar molecule, and a nitrogenous base
The sugar in DNA is deoxyribose, while RNA contains ribose
The nitrogenous bases in RNA are adenine, uracil, cytosine, and guanine
Nucleotides are linked together through phosphodiester bonds to form nucleic acid chains
Biomolecules Summary
Summary
Biomolecules are vital for the proper functioning and survival of living organisms
Carbohydrates provide energy for cellular processes and structural support
Proteins perform various functions, including enzymatic reactions and structural support
Lipids maintain cell membrane integrity and serve as energy storage molecules
Nucleic acids store and transmit genetic information necessary for protein synthesis and cell function