General Life Science: Characteristics, Organization, Systems, and Energy Flow

Vocabulary practice flashcards covering the characteristics of living organisms, cell theory, organelle functions, plant vs. animal cells, homeostasis, metabolism, and energy flow across ecosystems.

Life Science

The scientific study of organisms, their life processes, their evolutionary history, and their interactions with the environment.

Cell

The smallest fundamental unit capable of carrying out all life processes, universally possessing a membrane, cytoplasm, genetic material, and ribosomes.

Cell Theory

A foundational biological concept stating that all organisms are composed of one or more cells, the cell is the basic unit of structure and function in life, and all cells arise from pre-existing cells through cell division.

Robert Hooke

The scientist who observed thin slices of cork under a microscope in 1665 and coined the biological term 'cell' because the compartments resembled small rooms.

Antonie van Leeuwenhoek

The microscopist who observed living microorganisms in the 1670s using powerful handcrafted lenses and was among the first to describe living cells.

Matthias Schleiden

The German botanist who concluded in 1838 that all plants are composed of cells, contributing to the establishment of the cell theory.

Theodor Schwann

The German zoologist who concluded in 1839 that all animals are composed of cells, collaborating with Schleiden to help establish cell theory.

Rudolf Virchow

The pathologist who popularized the principle in 1855 that all living cells arise from pre-existing cells through cell division.

Cell Membrane

A selectively permeable boundary enclosing the cell that regulates molecular transport and facilitates communication.

Cytoplasm

The fluid-filled internal cellular medium that suspends organelles, serves as the site for metabolic reactions, and enables intracellular transport.

Nucleus

The cellular organelle that stores genetic material (DNA) and controls transcription and gene expression.

Mitochondrion

The double-membrane organelle responsible for generating the majority of cellular ATP via aerobic respiration.

Chloroplast

A specialized plant cell organelle containing chlorophyll that captures light energy to synthesize carbohydrates through photosynthesis.

Plant Cell

A eukaryotic cell characterized by a rigid cellulose cell wall, chloroplasts, and a large central vacuole that maintains internal turgor pressure.

Animal Cell

A eukaryotic cell with a flexible plasma membrane and varied shapes that lacks a cellulose cell wall and chloroplasts, possessing small vesicles rather than a large central vacuole.

Levels of Biological Organization

The hierarchical arrangement of complex living systems: $\text{Cell} \rightarrow \text{Tissue} \rightarrow \text{Organ} \rightarrow \text{Organ System} \rightarrow \text{Organism}$.

Growth

The process of increasing total cell number, individual cell size, or both through regulated metabolic activity.

Development

The progressive change in an organism's physical form and function brought about by cell division, cellular differentiation, and gene expression.

Metamorphosis

A developmental tissue reorganization process through distinct life cycle stages: $\text{egg} \rightarrow \text{larva} \rightarrow \text{pupa} \rightarrow \text{adult}$.

Energy

The biological capacity to drive cellular work, transferred within chemical bonds and ATP, which flows one-way through ecosystems and disperses as heat.

Matter

Physical material composed of chemical elements such as C, H, O, N, and P that cycle continuously through living organisms and abiotic environments.

Cellular Respiration

The metabolic pathway in which cells oxidize glucose to release energy for ATP production: $\text{C}_6\text{H}_{12}\text{O}_6 + 6\text{O}_2 \rightarrow 6\text{CO}_2 + 6\text{H}_2\text{O} + \text{ATP}$.

Photosynthesis

The light-driven chemical pathway occurring in chloroplasts that converts water and carbon dioxide into sugars: $6\text{CO}_2 + 6\text{H}_2\text{O} + \text{light} \rightarrow \text{C}_6\text{H}_{12}\text{O}_6 + 6\text{O}_2$.

Stimulus

A detectable physical or chemical alteration in an organism's external or internal environment that triggers a biological response.

Phototropism

A physiological growth response by which plant shoots orient and bend toward a light source through unequal cellular elongation.

Homeostasis

The dynamic physiological process of maintaining stable internal conditions within tolerable biological limits despite external fluctuations.

Negative Feedback

A regulatory mechanism that detects physiological deviation from a set point and activates effectors to oppose and reduce the initial disturbance.

Effector

A body structure such as a muscle, gland, or blood vessel that carries out a physiological action directed by a control center to alter internal conditions.

Asexual Reproduction

A mode of reproduction involving a single parent (e.g., binary fission, budding, or vegetative propagation) producing offspring that are rapid and genetically identical.

Sexual Reproduction

A reproductive process that combines gametes via meiosis and fertilization to create genetically distinct offspring, introducing population variation.

Evolutionary Adaptation

The process across generations whereby inherited advantageous traits increase in frequency within a population due to natural selection pressures.

Food Chain

A linear sequence of organisms illustrating the directional transfer of energy from primary producers up to successive consumer trophic levels.

Producers

Autotrophic organisms, including plants and algae, that synthesize organic molecules from $\text{CO}_2$ and water using sunlight or chemical energy.

Consumers

Heterotrophic organisms that obtain biomass, matter, and chemical energy by feeding on autotrophs or other heterotrophs.

Decomposers

Organisms, such as bacteria and fungi, that break down dead organic matter and recycle mineral nutrients back into the ecosystem.

Biogeochemical Cycles

Natural pathways—such as the water, carbon, nitrogen, oxygen, phosphorus, and sulfur cycles—through which conserved chemical elements cycle among organisms, air, water, and soil.

Life Science

The scientific study of organisms, their life processes, their evolutionary history, and their interactions with the environment.

Cell

The smallest fundamental unit capable of carrying out all life processes, universally possessing a membrane, cytoplasm, genetic material, and ribosomes.

Cell Theory

A foundational biological concept stating that all organisms are composed of one or more cells, the cell is the basic unit of structure and function in life, and all cells arise from pre-existing cells through cell division.

Robert Hooke

The scientist who observed thin slices of cork under a microscope in 1665 and coined the biological term 'cell' because the compartments resembled small rooms.

Antonie van Leeuwenhoek

The microscopist who observed living microorganisms in the 1670s using powerful handcrafted lenses and was among the first to describe living cells.

Matthias Schleiden

The German botanist who concluded in 1838 that all plants are composed of cells, contributing to the establishment of the cell theory.

Theodor Schwann

The German zoologist who concluded in 1839 that all animals are composed of cells, collaborating with Schleiden to help establish cell theory.

Rudolf Virchow

The pathologist who popularized the principle in 1855 that all living cells arise from pre-existing cells through cell division.

Cell Membrane

A selectively permeable boundary enclosing the cell that regulates molecular transport and facilitates communication.

Cytoplasm

The fluid-filled internal cellular medium that suspends organelles, serves as the site for metabolic reactions, and enables intracellular transport.

Nucleus

The cellular organelle that stores genetic material (DNA) and controls transcription and gene expression.

Mitochondrion

The double-membrane organelle responsible for generating the majority of cellular ATP via aerobic respiration.

Chloroplast

A specialized plant cell organelle containing chlorophyll that captures light energy to synthesize carbohydrates through photosynthesis.

Plant Cell

A eukaryotic cell characterized by a rigid cellulose cell wall, chloroplasts, and a large central vacuole that maintains internal turgor pressure.

Animal Cell

A eukaryotic cell with a flexible plasma membrane and varied shapes that lacks a cellulose cell wall and chloroplasts, possessing small vesicles rather than a large central vacuole.

Levels of Biological Organization

The hierarchical arrangement of complex living systems: $\text{Cell} \rightarrow \text{Tissue} \rightarrow \text{Organ} \rightarrow \text{Organ System} \rightarrow \text{Organism}$.

Growth

The process of increasing total cell number, individual cell size, or both through regulated metabolic activity.

Development

The progressive change in an organism's physical form and function brought about by cell division, cellular differentiation, and gene expression.

Metamorphosis

A developmental tissue reorganization process through distinct life cycle stages: $\text{egg} \rightarrow \text{larva} \rightarrow \text{pupa} \rightarrow \text{adult}$.

Energy

The biological capacity to drive cellular work, transferred within chemical bonds and ATP, which flows one-way through ecosystems and disperses as heat.

Matter

Physical material composed of chemical elements such as C, H, O, N, and P that cycle continuously through living organisms and abiotic environments.

Cellular Respiration

The metabolic pathway in which cells oxidize glucose to release energy for ATP production: $\text{C}_6\text{H}_{12}\text{O}_6 + 6\text{O}_2 \rightarrow 6\text{CO}_2 + 6\text{H}_2\text{O} + \text{ATP}$.

Photosynthesis

The light-driven chemical pathway occurring in chloroplasts that converts water and carbon dioxide into sugars: $6\text{CO}_2 + 6\text{H}_2\text{O} + \text{light} \rightarrow \text{C}_6\text{H}_{12}\text{O}_6 + 6\text{O}_2$.

Stimulus

A detectable physical or chemical alteration in an organism's external or internal environment that triggers a biological response.

Phototropism

A physiological growth response by which plant shoots orient and bend toward a light source through unequal cellular elongation.

Homeostasis

The dynamic physiological process of maintaining stable internal conditions within tolerable biological limits despite external fluctuations.

Negative Feedback

A regulatory mechanism that detects physiological deviation from a set point and activates effectors to oppose and reduce the initial disturbance.

Effector

A body structure such as a muscle, gland, or blood vessel that carries out a physiological action directed by a control center to alter internal conditions.

Asexual Reproduction

A mode of reproduction involving a single parent (e.g., binary fission, budding, or vegetative propagation) producing offspring that are rapid and genetically identical.

Sexual Reproduction

A reproductive process that combines gametes via meiosis and fertilization to create genetically distinct offspring, introducing population variation.

Evolutionary Adaptation

The process across generations whereby inherited advantageous traits increase in frequency within a population due to natural selection pressures.

Food Chain

A linear sequence of organisms illustrating the directional transfer of energy from primary producers up to successive consumer trophic levels.

Producers

Autotrophic organisms, including plants and algae, that synthesize organic molecules from $\text{CO}_2$ and water using sunlight or chemical energy.

Consumers

Heterotrophic organisms that obtain biomass, matter, and chemical energy by feeding on autotrophs or other heterotrophs.

Decomposers

Organisms, such as bacteria and fungi, that break down dead organic matter and recycle mineral nutrients back into the ecosystem.

Biogeochemical Cycles

Natural pathways—such as the water, carbon, nitrogen, oxygen, phosphorus, and sulfur cycles—through which conserved chemical elements cycle among organisms, air, water, and soil.

Musculoskeletal System

The combined organ system composed of bones, joints, skeletal muscles, tendons, and ligaments that provides structural framework, protects internal organs, and produces locomotion.

Anterior Cruciate Ligament (ACL)

A major intra-articular knee ligament connecting the femur to the tibia that resists rotational forces and stops the lower leg from sliding forward relative to the thigh.

Ligament

A band of tough, flexible, fibrous connective tissue that joins two bones across a joint capsule to provide passive mechanical stability.

Tendon

A cord of dense fibrous connective tissue that anchors a muscle to a bone, transmitting muscular tension to create joint movement.

Joint Stabilization

The immediate care priority for acute musculoskeletal trauma, involving rest and immobilization of injured skeletal structures to prevent secondary soft tissue tears and nerve compromise.

Interacting Organ Systems

The functional dependency among body systems, such as the nervous system coordinating motor commands while the skeletal and muscular systems execute movement.

Systemic Impact of Musculoskeletal Damage

The physiological outcome where structural damage to stabilizing connective tissues impairs muscular leverage, disrupts joint mechanics, and limits whole-organism mobility.