Chapter 1: Introduction to Biological Concepts and Research (Biology)

Vocabulary flashcards covering key terms and definitions from Chapter 1: Introduction to Biological Concepts and Research.

Emergent properties

Characteristics that depend on the level of organization; life is an emergent property of the organization of cells from matter.

Levels of organization

A hierarchical progression from cells to biosphere, including cells, unicellular and multicellular organisms, populations, communities, ecosystems, and the biosphere.

Biosphere

All regions of Earth’s crust, waters, and atmosphere that sustain life.

Ecosystem

A community plus the nonliving environmental factors with which it interacts.

Community

A group of all populations of different organisms that live in the same place.

Population

Group of individuals of the same species living in the same area.

Cell

Smallest unit with the capacity to live and reproduce; the basic unit of life.

DNA (Deoxyribonucleic acid)

A large, double-stranded, helical molecule that contains instructions for assembling a living organism.

Genome

The complete set of DNA in a living organism.

Gene

A specific region of the genome that encodes instructions for building RNA and protein.

RNA (Ribonucleic acid)

Nucleic acid that directs the synthesis of proteins; transcribed from DNA.

Transcription

Process of copying DNA into messenger RNA (mRNA).

Translation

Process of translating mRNA into an amino acid chain to form a protein.

mRNA

Messenger RNA; carries genetic information from DNA to ribosomes for protein synthesis.

Protein

Molecules that carry out most life activities; formed by folding amino acid chains.

Metabolism

The ability of a cell or organism to extract energy and use it to maintain, grow, and reproduce.

Photosynthesis

Process by which sunlight energy is captured and converted into chemical energy in sugars.

Cellular respiration

Process by which organisms break down molecules with oxygen to release energy.

Primary producers

Photosynthetic organisms that form the base of the food chain.

Consumers

Organisms that feed on other organisms; animals consuming producers or other consumers.

Decomposers

Bacteria and fungi that break down dead matter into raw materials.

Homeostasis

Regulation of internal body conditions within a narrow range.

Inheritance

Transmission of DNA from one generation to the next.

Development

Series of changes transforming a fertilized egg into an adult.

Life cycle

Sequential stages through which individuals develop, encoded in DNA.

Evolution

All populations change through time; descent from a common ancestor; diversity; unifying theme.

Natural selection

Process by which favorable traits become more common in a population due to differential reproduction.

Artificial selection

Human-driven selection of traits in breeding to produce desired characteristics.

Mutations

Random changes in DNA that generate variation; rarely beneficial; can be neutral or harmful.

Adaptation

Beneficial traits that help an organism survive or reproduce under certain conditions.

Camouflage

Adaptation where coloration or patterning helps an organism blend with its environment.

Binomial nomenclature

Two-part scientific name identifying genus and species (Genus species).

Species

All populations of individuals that can interbreed and share similar structure, biochemistry, and behavior.

Genus

Group of related species that share a recent common ancestry.

Hierarchical classification

Traditional grouping: Species > Genus > Family > Order > Class > Phylum > Kingdom, with Domain added as the most inclusive.

Domain

The highest taxonomic rank; the three domains are Bacteria, Archaea, and Eukarya.

Kingdoms (Plantae, Fungi, Animalia)

Major lineages within Eukarya; Plantae (plants), Fungi (decomposers), and Animalia (multicellular consumers).

Phylogenetic tree

Diagram showing evolutionary relationships; forks represent speciation events; branches show lineages.

Prokaryote

Organisms in Bacteria and Archaea; cells lack a nucleus; DNA not separated from other components.

Eukaryote

Organisms with cells that contain a nucleus and organelles.

Model organisms

Species used in research because they have rapid development, short life cycles, and small size.

Biological research

All efforts to understand the living world; includes basic and applied research; honesty is essential.

Scientific method

Observations, hypothesis formation, prediction, experimentation or data collection, interpretation; publication for reproducibility.

Observational data

Descriptive information about biological structures or processes.

Experimental data

Data derived from controlled manipulation of a system to test hypotheses.

Hypothesis

Tentative explanation that is testable and falsifiable; explains relationships between variables.

Null hypothesis

A statement of no effect or no relationship used as a baseline in hypothesis testing.

Variables

Factors that differ among places or individuals; include independent and dependent variables.

Inductive reasoning

Reasoning from specific observations to broader generalizations.

Deductive reasoning

Reasoning from general principles to specific predictions.

Replicates

Multiple subjects that receive the same treatment in an experiment.

Control

A baseline group where no experimental manipulation is applied; used to compare with the experimental group.

Scientific theories

Well-supported explanations that unify a broad range of observations; considered true until disproven; differs from everyday use of 'theory.'

Molecular tools (Genomics, Proteomics, Bioinformatics)

Genomics studies genomes; Proteomics studies the proteome; Bioinformatics analyzes large biological data sets.