TASC Biology Level 3 study guide
TASC Biology Level 3 · Work through your exam, one topic at a time.
TASC Biology Level 3 is an independent study resource for learners who want a structured, mid-level review of biology before sitting a high school equivalency or placement-style science assessment. It suits candidates who already know basic cell vocabulary and want to connect molecules, heredity, evolution, organisms, and ecosystems into one coherent picture, and it works equally well for adult learners returning to study after a break. The material is organized around six domains: molecules and cells, genetics and heredity, evolution and diversity, organisms and populations, ecology and environment, and scientific inquiry and skills. Each domain blends recall with application, so you practice interpreting data, reading diagrams described in text, and choosing the best explanation rather than simply naming terms. The TASC Biology Level 3 study guide has 6 sections and about 1,520 words.
01Molecules and Cells
Cells are the basic units of structure and function. Prokaryotic cells lack a membrane-bound nucleus and organelles; eukaryotic cells have both.
295 words, about 1 min02Genetics and Heredity
DNA is a double helix of nucleotides; adenine pairs with thymine and guanine with cytosine. DNA replicates semiconservatively, and genes are transcribed into mRNA, which ribosomes translate into proteins using codons.
261 words, about 1 min03Evolution and Diversity
Evolution is change in allele frequencies in a population over time. Natural selection acts on heritable variation: individuals with advantageous traits survive and reproduce more, increasing those traits in later generations.
232 words, about 1 min04Organisms and Populations
Organisms maintain homeostasis, keeping internal conditions stable through feedback. Feedback loops can be negative (correcting a deviation) or positive (amplifying it).
241 words, about 1 min05Ecology and Environment
Ecology studies interactions among organisms and their environment. Energy flows through food chains from producers to consumers, while nutrients cycle through ecosystems.
244 words, about 1 min06Scientific Inquiry and Skills
Scientific inquiry follows a process: observe, ask a question, form a hypothesis, design a controlled experiment, collect and analyze data, and draw conclusions. A hypothesis is a testable prediction.
247 words, about 1 min