High School Biology Vocabulary

Understanding High School Biology Vocabulary

This vocabulary set covers the big story of biology, from tiny molecules inside cells to the history of life across Earth. The words are not separate facts. They describe connected systems.

A cell needs a boundary, energy, instructions, and working parts. An organism must grow, respond to its environment, reproduce, and obtain matter and energy. Groups of organisms interact in ecosystems.

Across many generations, populations change through evolution. When you see a new term, place it on this scale. Decide whether it belongs mainly to molecules, cells, organisms, populations, or ecosystems.

Cell biology explains how life functions at a small scale. Phospholipids form the basic structure of cell membranes. Selective permeability means that a membrane controls what crosses it.

Transport proteins help certain substances move when the phospholipid layer blocks them. Concentration gradients help predict movement, since particles tend to spread from crowded areas toward less crowded areas. Organelles divide jobs inside a cell.

The nucleus stores genetic information. Mitochondria release usable energy from food through cellular respiration. Chloroplasts capture light energy during photosynthesis.

ATP is the cell's short-term energy supply. The electron transport chain and ATP synthase are parts of a process that produces much of that ATP. Link every structure to its job and to the source of energy it uses.

Genetics explains how information passes from parents to offspring. Genes are parts of DNA, while alleles are different versions of a gene. Genotype describes an organism's allele combination.

Phenotype is what can be observed, such as a trait or feature. A phenotype often reflects both inherited alleles and environmental conditions. Heterozygous describes one kind of allele combination, not a trait by itself.

Variation in a population gives natural selection material to act on. Mutations can create new variation. Selection pressures make some inherited traits more helpful than others in a particular environment.

Over generations, this can change allele frequency, lead to adaptation, and sometimes contribute to speciation. Phylogenetic trees show evidence-based ideas about common ancestry rather than a ladder of progress.

Ecology connects living things to energy flow and environmental conditions. Producers capture energy, usually from sunlight. Consumers obtain energy by eating organisms.

Decomposers return matter from dead material to the environment. Food webs show that most organisms have several feeding links, not one simple path. Trophic levels help track energy as it moves through those links.

Ecosystems include organisms plus abiotic factors such as water, temperature, soil, and light. Biomes are larger climate-based regions that contain related ecosystem patterns. Biodiversity can make ecosystems more resilient because many species can fill different roles.

Study this deck by making connection maps. Use arrows labeled with actions such as contains, uses, transfers, affects, or evolves into. Then explain one chain aloud, such as how sunlight can become ATP in a plant cell, support a food web, and influence survival in a population.