First Exam Flashcards
(90 cards)
hierarchy
The organization of biological structures, from simplest to most complex (e.g., atoms, molecules, cells, tissues, organs, organisms, etc.).
atom
The smallest unit of matter, composed of protons, neutrons, and electrons.
Molecule
A group of atoms bonded together, representing the smallest fundamental unit of a chemical compound.
Macromolecule
A large molecule made up of smaller subunits, such as proteins, nucleic acids, lipids, and carbohydrates.
Organelle
Specialized structures within a cell that perform specific functions (e.g., nucleus, mitochondria).
Cell
The smallest unit of life that can function independently, consisting of cytoplasm and a nucleus enclosed in a membrane.
Tissue
A group of similar cells that work together to perform a specific function.
Organ
A structure made up of tissues that work together to carry out specific functions (e.g., heart, lungs).
Population
A group of individuals of the same species living in the same area at the same time.
Species
A group of organisms that can interbreed and produce fertile offspring.
Community
All populations of different species that live and interact within the same area.
Ecosystem
A biological community of interacting organisms and their physical environment.
The global sum of all ecosystems, the zone of life on Earth.
Biosphere
Carbohydrates
Organic molecules composed of carbon, hydrogen, and oxygen, typically in a 1:2:1 ratio. Primary function is to provide energy (e.g., sugars, starches).
Proteins
Large biomolecules made of amino acids that perform various functions such as catalyzing metabolic reactions, DNA replication, and transporting molecules.
Lipids
Hydrophobic molecules, including fats, oils, and phospholipids, that are crucial for energy storage and making up cell membranes.
Nucleic Acids
Macromolecules (DNA and RNA) made of nucleotide chains that store and transfer genetic information.
Hydrocarbons
Organic compounds consisting entirely of hydrogen and carbon. They form the basis of most organic molecules.
List of Functional Groups
Hydroxyl, Carbonyl, Carboxyl, Amino, Sulfhydryl, Phosphate, Methyl
Functional Group
A specific group of atoms within a molecule that is responsible for certain chemical reactions and properties of the molecule.
Isomer
same molecular formula but different structural formula
stereoisomer
same molecular formula but differ in spatial arrangement and orientation
enantiomer
molecules are mirror images of each other
Macromolecule
Large, complex molecules, usually composed of thousands of atoms, including proteins, nucleic acids, carbohydrates, and lipids.