Macromolecules

Monomer

A monomer is a small, simple molecule that can join together with other similar molecules to form a larger polymer. Monomers are the building blocks of macromolecules such as proteins, nucleic acids, and carbohydrates.

Polymer

A polymer is a large molecule composed of many repeated subunits called monomers, which can be identical or different. These macromolecules play crucial roles in biological structures and functions, including proteins and nucleic acids.

Macromolecule

A macromolecule is a large, complex molecule composed of smaller units called monomers. Macromolecules include proteins, nucleic acids, and carbohydrates, which are essential for various biological processes.

Dehydration

A dehydration reaction is a chemical process that involves the loss of a water molecule when two monomers bond together, forming a polymer. This reaction is essential in the synthesis of macromolecules such as proteins and nucleic acids.

Hydrolysis

A hydrolysis reaction is a chemical process that involves the addition of a water molecule to break bonds between monomers, resulting in the decomposition of polymers. This reaction is critical for the breakdown of macromolecules into their constituent units.

Other name for Dehydration

Condensationreaction, as it involves the removal of water during the formation of a bond between monomers.

Carbohydrate

A type of macromolecule made of sugar molecules, primarily serving as a source of energy and structural components in living organisms.

Monosaccharides

The simplest form of carbohydrates, consisting of single sugar molecules that cannot be hydrolyzed into smaller units. Monosaccharides serve as basic building blocks for more complex carbohydrates.

Disaccarides

Carbohydrates composed of two monosaccharide units linked by glycosidic bonds. Disaccharides are formed through dehydration synthesis and serve as energy sources.

Polysaccharides

Carbohydrates composed of long chains of monosaccharide units. They function as energy storage and structural support in living organisms.

Examples of Monosaccharides

include glucose, fructose, and galactose. They are fundamental carbohydrates that can be quickly utilized by the body for energy.

Examples of Disaccharides

include sucrose, lactose, and maltose. These sugars are formed from the combination of two monosaccharides and are important for energy provision.

Examples of Polysaccharides

include starch, glycogen, and cellulose. These complex carbohydrates play crucial roles in energy storage and providing structural integrity to plant cell walls.

starch

a polysaccharide composed of glucose units, primarily used by plants for energy storage.

Cellulose

a polysaccharide made up of long chains of glucose molecules, providing structural support in plant cell walls.

Chitin

a polysaccharide that forms the exoskeleton of arthropods and provides structural support in fungi.

lipids

a diverse group of hydrophobic organic compounds that include fats, oils, and phospholipids, serving as energy storage and structural components in cells.

fattyacid

a carboxylic acid with a long aliphatic chain, commonly found in lipids. They can be saturated or unsaturated, influencing the physical properties of fats and oils.

glycerol

a simple polyol compound that serves as a backbone for triglycerides and phospholipids, playing a crucial role in fat metabolism.

triglyceride

a type of lipid made from one glycerol molecule and three fatty acids, important for energy storage in organisms.

Saturated fattyacid

a fatty acid in which all carbon atoms in the chain are fully saturated with hydrogen atoms, resulting in no double bonds. This structure typically leads to a solid state at room temperature.

Unsaturated fattyacid

a fatty acid that contains one or more double bonds between carbon atoms in the chain, leading to a liquid state at room temperature.

Examples of saturated fatty acids

include palmitic acid and stearic acid.

Examples of Unsaturated fattyacids

include oleic acid and linoleic acid.

Glycosidic bond

A covalent bond formed between a carbohydrate (sugar) molecule and another molecule, typically another sugar. This bond is formed through a condensation reaction that releases water.

Ester bond

A type of covalent bond that forms between an alcohol and a carboxylic acid, resulting in the release of water during a condensation reaction.

Phospholipids

A class of lipids that are a major component of all cell membranes, consisting of two fatty acids, a glycerol unit, and a phosphate group.

Hydrophilic

Describing molecules or parts of molecules that are attracted to water and can form hydrogen bonds, often found in polar molecules.

Hydrophobic

Describing molecules or parts of molecules that repel water and do not interact favorably with polar solvents, often found in nonpolar molecules.

Steroids

A class of lipids characterized by a four-ring structure, steroids play key roles in cell membrane structure and as hormones.

Examples of steroids

include cholesterol, testosterone, and estrogen.

proteins

Biologically significant macromolecules composed of amino acids, proteins perform various functions, including enzymatic activity, structural support, and signaling.

Building blocks of Proteins

are amino acids that link together through peptide bonds to form polypeptides.

Building blocks of Carbohydrates

are monosaccharides, such as glucose and fructose, that combine to form polysaccharides through glycosidic bonds.

Building blocks of Lipids

are fatty acids and glycerol that combine to form triglycerides and phospholipids.

Monomers of lipids

are not true monomers but primarily consist of fatty acids and glycerol that assemble into larger structures.

primary structure

is the unique sequence of amino acids in a polypeptide chain, determining the protein's specific characteristics and function.

Secondary structure

refers to the regular, repeated patterns of folding or coiling in a polypeptide chain, including alpha-helices and beta-pleated sheets, stabilized by hydrogen bonds.

Tertiary structure

is the overall three-dimensional shape of a polypeptide, formed by the interactions between amino acid side chains and stabilized by various bonds, including hydrogen bonds, ionic interactions, and disulfide bridges.

Quaternary structure

refers to the assembly of multiple polypeptide chains into a functional protein complex, stabilized by interactions such as hydrogen bonds, ionic interactions, and hydrophobic forces.

Denaturation

is the process in which a protein loses its native structure due to factors such as heat, pH change, or chemical exposure, leading to a loss of function.

Renaturation

is the process by which a denatured protein re-establishes its original three-dimensional structure and regains its biological function under favorable conditions.

nucleotides

the building blocks of nucleic acids, consisting of a sugar, a phosphate group, and a nitrogenous base. They play a crucial role in storing and transmitting genetic information.

Nucleic acids

are biopolymers essential for life, composed of long chains of nucleotides. They include DNA and RNA, which store and carry genetic information.

Phosphodiester bond

is a chemical bond that links nucleotides together in nucleic acids. It forms between the phosphate group of one nucleotide and the sugar of another, creating a sugar-phosphate backbone.

purines and pyramides

are two classes of nitrogenous bases found in nucleotides. Purines consist of adenine and guanine, while pyrimidines include cytosine, thymine, and uracil.

Nucleoside

is a compound formed when a nitrogenous base is attached to a sugar molecule, without the phosphate group. Nucleosides are the building blocks of nucleotides.

DNA and RNA differences

The primary differences between DNA and RNA include the type of sugar in their nucleotides (deoxyribose in DNA and ribose in RNA), the presence of thymine in DNA versus uracil in RNA, and DNA being double-stranded while RNA is typically single-stranded.

peptide bond

is a covalent bond that links amino acids together in a protein. It forms during a condensation reaction between the carboxyl group of one amino acid and the amino group of another.

active transport

is the movement of molecules across a membrane from a region of lower concentration to a region of higher concentration, requiring energy input, usually in the form of ATP.

Passive tranport

is the movement of molecules across a membrane from a region of higher concentration to a region of lower concentration without the use of energy.

Diffusion

is the process by which molecules spread from areas of high concentration to areas of low concentration, resulting in even distribution.

Osmosis

is the movement of water molecules through a selectively permeable membrane from an area of low solute concentration to an area of high solute concentration.

Facilitated diffusion

is a type of passive transport that uses specific proteins to help move molecules across cell membranes without energy.

isotonic

solution has equal concentrations of solute on both sides of a selectively permeable membrane, resulting in no net movement of water.

hypertonic

solution has a higher concentration of solute compared to another solution, leading to water moving out of the cell.

hypotonic

solution has a lower concentration of solute compared to another solution, causing water to move into the cell.

ion pumps

membrane proteins that actively transport ions across a membrane, using ATP to move ions against their concentration gradient.

Bulk tranport

The process by which large molecules or volumes of substances are transported across the cell membrane, often involving vesicles.

Endocytosis

The process by which cells internalize substances from their environment by engulfing them within a vesicle.

Exocytosis

The process by which cells expel substances by releasing them from vesicles to the exterior.

pseudopodia

cell extensions that allow for movement and the engulfing of particles during processes like phagocytosis.

Phagocytosis

A form of endocytosis where cells engulf large particles or other cells, facilitating their internalization for digestion or immune response.

carrier proteins

Proteins that facilitate the transport of specific substances across a cell membrane by binding to them and undergoing a conformational change.

Channel proteins

Proteins that create pathways through cell membranes, allowing selective diffusion of ions and molecules.

photosynthesis

The process by which green plants and some other organisms use sunlight to synthesize foods with the help of chlorophyll, converting carbon dioxide and water into glucose and oxygen.

Equation for photosynthesis

6CO2 + 6H2O + light
ightarrow C6H{12}O6 + 6O2

Chlorophyll

A green pigment found in plants that is essential for photosynthesis. It absorbs light energy, primarily from the blue and red wavelengths, and converts it into chemical energy.

Chloroplast

Organelles in plant cells where photosynthesis takes place, containing chlorophyll and enzymes necessary for the process.

Light independent reaction

The phase of photosynthesis that does not require light directly and occurs in the stroma of chloroplasts, utilizing ATP and NADPH produced in the light-dependent reactions to convert carbon dioxide into glucose.

Light dependent reaction

The phase of photosynthesis that requires light and takes place in the thylakoid membranes of chloroplasts, where light energy is converted into chemical energy in the form of ATP and NADPH.

Thylakoid

A membrane-bound compartment in chloroplasts where the light-dependent reactions of photosynthesis occur, containing chlorophyll and proteins essential for capturing light energy.

Stroma

The fluid-filled space in chloroplasts surrounding the thylakoids, where the light-independent reactions of photosynthesis occur, containing enzymes and substrates necessary for converting carbon dioxide into glucose.

ATP

A high-energy molecule produced during the light-dependent reactions of photosynthesis, used as an energy source for various cellular processes.

NADP+ (Nicotinamide adenine dinucleotide phosphate)

A coenzyme involved in redox reactions, it carries electrons from light-dependent reactions to the light-independent reactions during photosynthesis.

CELLULAR RESPIRATION

The metabolic process in which cells convert glucose and oxygen into energy, producing carbon dioxide and water as byproducts, essential for cellular functions.

Aerobic

respiration is a type of cellular respiration that requires oxygen to produce energy, resulting in a more efficient energy yield compared to anaerobic processes.

Anaerobic

respiration is a type of cellular respiration that occurs in the absence of oxygen, leading to the production of energy through fermentation and resulting in byproducts such as ethanol or lactic acid.

Glycolysis

is the metabolic pathway that breaks down glucose into pyruvate, producing a small amount of ATP and NADH in the process, and occurs in the cytoplasm of cells.

Krebs cycle

is a series of enzyme-catalyzed chemical reactions of central importance in all living organisms that involves the oxidation of acetyl-CoA to produce ATP, NADH, and FADH₂, taking place in the mitochondria.

Electron transport chain

is the final stage of cellular respiration where electrons are transferred through a series of protein complexes, ultimately producing ATP via oxidative phosphorylation and utilizing oxygen as the final electron acceptor.

pyruvate

is a key intermediate in several metabolic pathways, formed during glycolysis and converted into acetyl-CoA for entry into the Krebs cycle.

mitochondria

are membrane-bound organelles found in eukaryotic cells that are the site of aerobic respiration and energy production, known as the powerhouse of the cell.

mitochondrial matrix

is the innermost compartment of mitochondria, containing enzymes for the Krebs cycle and the necessary machinery for ATP production.

cristae

are the folds of the inner mitochondrial membrane that increase the surface area for ATP production and house the electron transport chain.

NAD+ and FAD

are coenzymes that play crucial roles in cellular respiration by carrying electrons and protons to the electron transport chain.

NADH and FADH2

are the reduced forms of NAD+ and FAD, respectively, that carry higher energy electrons to the electron transport chain during cellular respiration.

Oxidative phosphorylation

is the process by which ATP is produced in the mitochondria through the transfer of electrons via the electron transport chain and the subsequent chemiosmotic coupling of ADP and inorganic phosphate.

Substrate Phosphorylation

is the direct generation of ATP from the transfer of a phosphate group to ADP from a phosphorylated intermediate during glycolysis and the Krebs cycle.

Fermentation

is a metabolic process that converts glucose to acids, gases, or alcohol in the absence of oxygen, allowing cells to generate energy without using the electron transport chain.

Lactic acid fermentation

is a type of fermentation where glucose is converted into lactic acid and ATP in anaerobic conditions, commonly occurring in muscle cells and some bacteria.

Alcohol fermentation

is a metabolic process that converts glucose into ethanol and carbon dioxide in anaerobic conditions, primarily carried out by yeast and some bacteria.

Final acceptor in ETC

is oxygen, which combines with electrons and protons to form water, allowing the electron transport chain to proceed and generate ATP.

Equation for cellular respiration

is a chemical equation that summarizes the process by which glucose and oxygen are converted into carbon dioxide, water, and ATP. The overall equation is: C6H{12}O6 + 6O2 ————- 6CO2 + 6H2O + ATP$$.

ATP

is a high-energy molecule that stores and provides energy for various cellular processes, serving as the primary energy carrier in all living organisms.

Sexual

reproduction is a biological process that involves the combination of genetic material from two parent organisms, resulting in offspring with genetic variations.

Asexual

is a mode of reproduction that does not involve the fusion of gametes, resulting in offspring that are genetically identical to the parent organism.

Chromosomes

are long, thread-like structures made of DNA and proteins that carry genetic information in the form of genes. They are found in the nuclei of eukaryotic cells and play a crucial role during cell division.