Week 1: Topic 1 - Introduction to the Science of Life and Levels of Organization

Vocabulary practice flashcards covering fundamental concepts, history of medicine, biological hierarchy, cell types, taxonomic classification, and microbiology from Topic 1: Introduction to the Science of Life and Levels of Organization.

Biology

The scientific study of life that investigates what life is, how it works, and spans scales from single cells developing into animals to global environmental interactions.

Levels of Biological Organization

The structural hierarchy of life spanning from smallest to largest: Molecule (DNA) $\rightarrow$ Cell (neuron) $\rightarrow$ Tissue (nervous tissue) $\rightarrow$ Organ (brain) $\rightarrow$ Organ System (nervous system) $\rightarrow$ Organism (individual fish) $\rightarrow$ Population $\rightarrow$ Community $\rightarrow$ Ecosystem $\rightarrow$ Biome $\rightarrow$ Biosphere.

Human Taxonomic Classification

The hierarchical taxonomic ranking for humans: Domain (Eukarya) $\rightarrow$ Kingdom (Animalia) $\rightarrow$ Phylum (Chordata) $\rightarrow$ Class (Mammalia) $\rightarrow$ Order (Primates) $\rightarrow$ Family (Hominidae) $\rightarrow$ Genus (Homo) $\rightarrow$ Species (sapiens).

Amoeba Structure

The anatomical features of a unicellular eukaryotic amoeba, including the pseudopodium, ectoplasm, endoplasm, cell membrane, nucleus, contractile vacuole, and food or digestive vacuoles.

Virchow's Principle

The tenet encapsulated by the Latin phrase "Omnis cellula e cellula" (all cells arise from pre-existing cells), asserting that disease originates at the cellular level.

Histopathology

The microscopic study of diseased tissue that arose alongside the development of staining methods and microscopy to become the cornerstone of medical diagnosis and cancer staging.

Watson and Crick ($1953$)

The scientists who deduced the double-helix structure of DNA using Rosalind Franklin's X-ray diffraction data, elucidating the molecular mechanism of inheritance.

Human Genome Project (HGP)

A large-scale international scientific initiative completed in the early $2000\text{s}$ that sequenced the human genome, laying the foundation for personalized genomic medicine.

Proteomics

The comprehensive study of protein structures, functions, and pathways to illuminate the molecular pathology of diseases like cancer, diabetes, and neurological disorders.

Stem Cells

Undifferentiated precursor cells that possess the ability to develop into specialized cell types, providing therapeutic potential for regenerative medicine and tissue repair.

Pharmacogenomics

The field analyzing how an individual's genetic profile affects their metabolic response to pharmaceuticals, allowing tailored drug therapies with minimized adverse effects.

Gene Therapy

Techniques aimed at editing, deleting, or inserting functional genes (e.g., using CRISPR-Cas$9$ technology) to correct defective genes causing disorders like cystic fibrosis and sickle cell anaemia.

Homeostasis

The active physiological regulation through which an organism maintains a stable, constant internal environment despite fluctuating external conditions.

Evolution

The gradual hereditary adaptation and genetic change observed within populations and organisms over successive generations.

Autotrophs

Organisms (such as plants) that capture energy directly from abiotic sources like sunlight via photosynthesis to synthesize organic molecules.

Heterotrophs

Organisms (such as animals) that cannot produce their own organic compounds and must obtain carbon and energy by consuming other organisms.

Biosphere

The highest level of biological organization, encompassing the entirety of planet Earth and all regions that support living organisms.

Biome

Broad regional ecosystem units defined by distinctive climatic patterns, dominant vegetation types, and characteristic communities (e.g., coral reefs, tropical rainforests, deserts).

Ecosystem

An ecological level composed of all biological communities in a particular physical environment interacting with the non-living (abiotic) elements.

Community

An ecological association consisting of all populations of different species coexisting and interacting within the same defined geographic area.

Population

A group of individuals belonging to the exact same species living within a specified geographical habitat at the same time.

Cell

The fundamental structural and functional unit of life, being the lowest organizational level capable of performing all processes required to sustain life.

Gene

A hereditary sequence of nucleotide units within a chromosome that carries coded instructions directing the expression and production of specific functional proteins.

Genome

The entire library of genetic instructions and chromosomal DNA sequences present within an individual cell of an organism.

Prokaryotic Cell

A structurally simpler cellular form that lacks a membrane-bound nucleus and internal membrane-enclosed organelles, characteristic of Bacteria and Archaea.

Eukaryotic Cell

A complex cell type characterized by a true membrane-bound nucleus enclosing DNA and compartmentalized internal membrane-bound organelles.

Taxonomy

The scientific discipline of naming, describing, and classifying living species into increasingly broad hierarchical ranks based on evolutionary relationships.

Carolus Linnaeus ($1707$-$1778$)

The Swedish botanist widely recognized as the father of taxonomy who introduced the standardized binomial nomenclature system for classifying species.

Binomial Nomenclature

The universal two-part naming convention where each species name is composed of its capitalized Genus followed by a lowercase characteristic specific epithet.

Domain Archaea

A taxonomic domain of unicellular prokaryotes, distinct from bacteria, often capable of surviving in extreme environments like boiling hot springs and hypersaline waters.

Domain Bacteria

The vastly diverse and widespread domain of microscopic, single-celled prokaryotic organisms lacking a true nucleus.

Domain Eukarya

The domain comprising all organisms possessing eukaryotic cells, organized into the kingdoms Protists, Fungi, Plantae, and Animalia.

Micro-organisms

Microscopic forms of life consisting of single cells (unicellular) or cell clusters (multicellular), including bacteria, archaea, protists, fungi, and non-cellular viral agents.

Alexander Fleming ($1928$)

The Scottish scientist who accidentally discovered penicillin, the first clinical antibiotic, when Penicillium mold inhibited the growth of Staphylococcus aureus.

Ernst Chain & Howard Florey

The researchers who, $12$ years after its discovery, purified and isolated penicillin from mold cultures, establishing its mass production as a life-saving drug during World War II.

Yersinia pestis

The flea-borne bacterial pathogen carried by rodents that triggered the Black Death (bubonic plague), killing an estimated $30\%$ to $50\%$ of Europe's population in the $14\text{th}$ century.