Unit 4 · BIO.1D
Practice one lesson at a time, or run the full unit review to get your completion code. Multiple-choice questions check as soon as you tap. Sorting, ordering, matching, and fill-in questions check when you press Check answer. Read the explanation, then go on with Next.
4.1Membrane · BIO.1D — the structure of the cell membrane and what can cross it.4.2Transport · BIO.1D.1 — passive transport, active transport, and the sodium-potassium pump.4.3Osmosis · BIO.1D.2 — hypertonic, hypotonic, and isotonic solutions and how water moves.TestFormats · BIO.1D.1 and BIO.1D.2 — Practice with common test question styles.Answer choices and cards shuffle on every attempt. Keyboard: number keys or A–D pick a choice, Enter checks, and the right arrow moves on. Your completion code includes your name, the review title, and your score.