Life Science
Life Science covers the foundational biology concepts for grades 6-7: cell theory, cell structures, living organism characteristics, classification, photosynthesis and respiration, cell division, Mendelian genetics, ecosystems and food webs, evolution by natural selection, and a survey of human body systems.
Who Should Take This
Designed for middle school students (grades 6-7) encountering formal biology for the first time, and for adult learners building scientific literacy before tackling high school or college biology courses. Basic reading comprehension is the only prerequisite; no prior science coursework is assumed.
What's Included in AccelaStudy® AI
Adaptive Knowledge Graph
Practice Questions
Lesson Modules
Console Simulator Labs
Exam Tips & Strategy
13 Activity Formats
Course Outline
1Cells and Cell Theory 9 topics
Describe the three tenets of cell theory — all living things are made of cells, cells are the basic unit of life, and all cells come from pre-existing cells — and name the scientists (Schleiden, Schwann, Virchow) who contributed each tenet
Distinguish prokaryotic cells (no membrane-bound nucleus, no organelles, smaller, include bacteria) from eukaryotic cells (membrane-bound nucleus, organelles, larger, include plant/animal/fungi/protist cells)
Describe the structure and function of major eukaryotic organelles including nucleus (houses DNA), mitochondria (cellular respiration/ATP), chloroplasts (photosynthesis), ribosomes (protein synthesis), and vacuoles (storage)
Apply the comparison of plant and animal cells by identifying structures unique to plant cells (cell wall, chloroplasts, large central vacuole) and those found in both, explaining how the differences relate to each cell type's function
Apply the concepts of diffusion and osmosis by explaining that particles move from high to low concentration (passive transport requiring no energy) and predict whether a cell will swell, shrink, or remain unchanged in hypertonic, hypotonic, and isotonic solutions
Analyze why cells are small by explaining that as cell size increases, surface area-to-volume ratio decreases, making it harder to exchange materials with the environment fast enough to support metabolism
Apply microscopy vocabulary including light vs electron microscopes, magnification, resolution, and explain why electron microscopes can resolve organelle ultrastructure that light microscopes cannot, given the wavelength limits of visible light
Describe active transport as moving molecules against a concentration gradient requiring ATP energy, give examples including sodium-potassium pump and nutrient uptake in intestinal cells, and contrast with passive transport that requires no energy
Analyze the endosymbiotic theory by explaining evidence that mitochondria and chloroplasts evolved from ancient prokaryotes engulfed by ancestral eukaryotic cells — including their double membranes, circular DNA, ribosomes matching bacteria, and independent binary fission
2Characteristics of Life and Classification 6 topics
Describe the seven characteristics of living things — cellular organization, metabolism, homeostasis, response to stimuli, reproduction, growth and development, and adaptation — and apply them to classify ambiguous cases like viruses
Describe the Linnaean classification hierarchy (domain, kingdom, phylum, class, order, family, genus, species) from broadest to most specific and explain binomial nomenclature using genus and species names italicized
Apply the three domain system (Bacteria, Archaea, Eukarya) and six kingdom system (Bacteria, Archaea, Protista, Fungi, Plantae, Animalia) by placing example organisms in the correct domain and kingdom based on cell type and key characteristics
Analyze why viruses are not classified as living organisms by identifying which of the seven characteristics of life they lack (no cellular organization, cannot reproduce independently) and describe their lytic and lysogenic replication cycles
Apply dichotomous key usage to identify organisms from a set of observable physical characteristics by following branching yes/no questions, and explain how taxonomic keys encode phylogenetic relationships
Describe the major groups of microorganisms including bacteria (prokaryotes, diverse metabolisms), archaea (prokaryotes, extreme environments), fungi (eukaryotes, decomposers), and protists (eukaryotes, diverse — algae, protozoa, slime molds), giving examples and ecological roles
3Photosynthesis and Cellular Respiration 6 topics
Describe photosynthesis as the process by which chloroplasts use light energy, carbon dioxide, and water to produce glucose and oxygen, write the summary equation 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂, and identify that light energy is converted to chemical energy
Describe cellular respiration as the process by which mitochondria break down glucose with oxygen to release energy as ATP, water, and carbon dioxide, write the summary equation, and explain that aerobic respiration is the reverse of photosynthesis
Apply the relationship between photosynthesis and respiration to explain carbon cycling between producers and consumers and evaluate how changes in light availability affect net oxygen production in an aquatic ecosystem
Describe fermentation as anaerobic energy release occurring when oxygen is unavailable, distinguish lactic acid fermentation (in muscle cells, yogurt bacteria) from alcoholic fermentation (yeast), and explain why fermentation is less efficient than aerobic respiration
Describe autotrophs (organisms that produce their own food via photosynthesis or chemosynthesis) vs heterotrophs (organisms that consume organic material from other organisms), and identify which role each type plays in a food web
Apply the concept of glucose as a universal energy currency by tracing how food macromolecules (carbohydrates, fats, proteins) are broken down into glucose or other metabolic intermediates before being oxidized for ATP production
4Cell Division and Reproduction 5 topics
Describe the cell cycle phases (interphase with G1/S/G2 and mitotic phase) and explain that interphase involves DNA replication and cell growth while mitosis distributes identical chromosome copies to two daughter cells
Apply the four stages of mitosis (prophase, metaphase, anaphase, telophase) by describing the chromosomal events at each stage and explaining that mitosis results in two genetically identical diploid daughter cells
Describe meiosis as producing four haploid gametes with half the chromosome number through two divisions including crossing over in prophase I, and explain why sexual reproduction increases genetic diversity compared to asexual reproduction
Apply comparison of asexual (binary fission, budding, vegetative propagation) and sexual reproduction by listing the advantages and disadvantages of each in terms of speed, genetic uniformity, and adaptation potential
Apply cell differentiation understanding by explaining that all cells in a multicellular organism contain the same DNA, yet express different genes — and relate this to how stem cells can develop into specialized tissues
5Genetics and Heredity 10 topics
Describe DNA as a double helix made of nucleotides with complementary base pairing (A-T, G-C), explain that genes are DNA segments coding for traits, and identify that chromosomes are tightly coiled DNA-protein structures in the nucleus
Describe Mendel's laws of segregation (allele pairs separate during gamete formation) and independent assortment (alleles for different genes assort independently), and explain dominant vs recessive allele relationships
Apply Punnett squares for monohybrid crosses to predict offspring genotype and phenotype ratios (3:1 and 1:1) from parent crosses, using correct notation for homozygous dominant (AA), heterozygous (Aa), and homozygous recessive (aa)
Apply dihybrid Punnett squares to predict offspring ratios for two-trait crosses (9:3:3:1 phenotype ratio) and identify genotype combinations that produce each phenotype class
Apply codominance and incomplete dominance patterns by predicting offspring phenotypes for flower color (red + white → pink in incomplete dominance; red + white → red-and-white in codominance) and distinguishing the two from complete dominance
Analyze how mutations (gene mutations and chromosomal mutations) alter genetic information, distinguish between silent, missense, and nonsense point mutations in conceptual terms, and explain that mutations are the ultimate source of new alleles
Apply sex-linked trait inheritance by explaining that genes on the X chromosome appear in all phenotypic males (XY) but require two copies in females (XX) for recessive expression, using color blindness or hemophilia as examples
Describe polygenic inheritance as traits controlled by multiple genes (skin color, height, intelligence) producing a continuous distribution of phenotypes in a population, contrasting with simple Mendelian single-gene traits
Apply karyotype analysis at an introductory level by describing a karyotype as a visual array of chromosome pairs ordered by size, identifying normal diploid (2n = 46) human karyotypes, and recognizing that an extra chromosome 21 causes Down syndrome
Describe genetic engineering and biotechnology applications including restriction enzymes cutting DNA, recombinant DNA insertion into plasmids, and uses such as insulin production, golden rice, and GMO crops, explaining benefits and ethical considerations
6Ecosystems and Food Webs 8 topics
Describe ecosystems as composed of biotic (living) and abiotic (non-living) components, and explain how biotic factors (organisms) and abiotic factors (water, temperature, light, soil) interact to shape a community
Apply food chain and food web analysis by identifying producers (autotrophs), primary consumers (herbivores), secondary consumers (omnivores/carnivores), and decomposers, tracing the direction of energy flow between trophic levels
Apply the 10% rule to energy pyramids by explaining that only about 10% of energy is transferred between trophic levels, predict biomass and organism count at each level, and explain why food chains rarely exceed four or five links
Analyze symbiotic relationships (mutualism, commensalism, parasitism), predator-prey dynamics, and competitive exclusion by predicting how removing or adding a species affects population sizes throughout the food web
Apply nitrogen cycle understanding to explain how nitrogen-fixing bacteria convert atmospheric N₂ to ammonia, nitrifying bacteria convert ammonia to nitrates, and denitrifying bacteria return nitrogen to the atmosphere, supporting plant growth throughout
Describe biomes as large geographic areas characterized by similar climate, vegetation, and wildlife, identify the major terrestrial biomes (tropical rainforest, temperate deciduous forest, grassland, desert, tundra, boreal forest) and their characteristic adaptations
Apply water cycle understanding to trace how water moves through precipitation, surface runoff, groundwater recharge, evaporation, and transpiration by plants, and explain how deforestation disrupts local precipitation patterns
Analyze human impacts on biodiversity including habitat destruction, invasive species introduction, overexploitation, and climate change, and evaluate conservation strategies including protected areas, species recovery plans, and habitat restoration
7Evolution and Natural Selection 6 topics
Describe Darwin's theory of natural selection using the four components — heritable variation within a population, more offspring produced than survive, differential survival of individuals with favorable traits, and increased frequency of those traits over generations
Apply adaptation analysis to explain how a specific physical or behavioral trait improves an organism's survival or reproductive success in a particular environment, providing examples from camouflage, beak shapes, antibiotic resistance
Describe evidence for evolution including the fossil record, comparative anatomy (homologous and analogous structures, vestigial structures), comparative embryology, and molecular evidence (DNA sequence similarities)
Analyze how artificial selection (selective breeding) provides a model for natural selection by tracing how humans selecting for desired traits in dogs, crops, and livestock has produced dramatic morphological changes over relatively few generations
Apply the concept of speciation by explaining that geographic isolation can prevent gene flow between populations, allowing them to diverge through independent mutations and selection pressures until they can no longer interbreed if reunited
Apply Hardy-Weinberg equilibrium conditions conceptually by listing the five assumptions (large population, no mutation, no migration, no natural selection, random mating) and explaining which assumption is violated in a described population scenario
8Human Body Systems 10 topics
Describe the hierarchy of biological organization from cells to tissues to organs to organ systems to organisms and explain how each level of organization adds functional capabilities not present at the level below
Describe the function of the skeletal (support and protection), muscular (movement via contraction), digestive (nutrient breakdown and absorption), and circulatory (transport of oxygen/nutrients/waste) systems and identify key structures in each
Describe the respiratory (gas exchange via lungs and alveoli), nervous (signal coordination via neurons and brain), endocrine (hormone-based regulation), and immune (pathogen defense via white blood cells and antibodies) systems and their key structures
Apply homeostasis concepts to explain how the nervous and endocrine systems use feedback loops (negative feedback) to maintain body temperature, blood glucose, and blood pressure within narrow functional ranges
Analyze the interdependence of organ systems by tracing how the circulatory, respiratory, and muscular systems must all function together during exercise, and how failure of one system (e.g., heart disease) impairs multiple body functions
Describe the immune system's two lines of defense — innate immunity (non-specific barriers and inflammatory response) and adaptive immunity (B-cell antibodies and T-cell cellular immunity) — and explain how vaccines train adaptive immunity using antigens
Apply digestion process tracing by following a food molecule from ingestion through mechanical and chemical digestion in the mouth, stomach, and small intestine, absorption in the small intestine, and water reabsorption in the large intestine
Analyze how lifestyle factors (diet, exercise, sleep, stress) influence multiple organ systems simultaneously, explaining how a sedentary high-fat diet impairs cardiovascular, endocrine (insulin resistance), and skeletal muscular function simultaneously
Describe the structure and function of the urinary system including the kidneys filtering blood to produce urine, the role of nephrons in filtration and reabsorption, and how kidneys regulate water balance and blood pressure through urine concentration
Apply the concept of disease etiology by classifying diseases as infectious (caused by pathogens: bacteria, viruses, fungi, parasites) vs non-infectious (genetic, autoimmune, degenerative, nutritional), and explain how the cause determines the treatment approach
Scope
Included Topics
- Cell theory (history and three tenets), eukaryotic vs prokaryotic cells, cell structures and organelles (nucleus, mitochondria, chloroplast, cell membrane, cell wall, ribosomes, vacuoles, endoplasmic reticulum), cell membrane and basic transport (osmosis, diffusion, active vs passive transport), characteristics of living things (organization, metabolism, homeostasis, response, reproduction, growth, adaptation), Linnaean classification system (domain, kingdom, phylum, class, order, family, genus, species) and binomial nomenclature, introduction to the six kingdoms, viruses vs living organisms, photosynthesis (light reactions overview, glucose production, equation 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂), cellular respiration (aerobic overview, equation, ATP production), mitosis and asexual reproduction, meiosis overview and sexual reproduction, introduction to genetics (DNA structure overview, genes and alleles, dominant vs recessive traits), Mendelian inheritance and Punnett squares (monohybrid and dihybrid), codominance and incomplete dominance, ecosystems (biotic vs abiotic factors, food chains and food webs, energy pyramids, trophic levels), biomes overview, human body systems (skeletal, muscular, digestive, circulatory, respiratory, nervous, immune — structure and function overview), microorganisms (bacteria, fungi, protists — characteristics and roles), evolution basics (natural selection, adaptation, variation, evidence for evolution), intro to environmental science (biodiversity, habitat, human impact)
Not Covered
- Molecular genetics and gene expression beyond intro DNA/RNA overview (AP Biology level)
- Detailed biochemistry (enzyme kinetics, metabolic pathways beyond overview)
- Ecological modeling and population dynamics equations (covered in Environmental Science)
- Anatomy and physiology detail at organ-system level (covered in Anatomy and Physiology)
- Advanced evolutionary theory (phylogenetics, speciation mechanisms — AP Biology level)
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