Cell Biology review games for Biology.
This unit covers cell organelles, cell membrane, prokaryotes vs eukaryotes and cell transport — essential concepts for Biology. Use our interactive study games to test your understanding, or review questions in traditional format below.
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This unit covers cell organelles, cell membrane, prokaryotes vs eukaryotes and cell transport — essential concepts for Biology. Use our interactive study games to test your understanding, or review questions in traditional format below.
Key Concepts Breakdown
1 Cell Organelles
Students must know the major organelles, their structures, and their specific functions within the cell. Understanding which organelles are found in plant vs. animal cells is frequently tested. The relationship between structure and function is a core exam theme.
Key Points
- Mitochondria produce ATP through cellular respiration; called the 'powerhouse of the cell'
- Ribosomes synthesize proteins and are found free in the cytoplasm or attached to rough ER
- The nucleus contains DNA and directs cell activities; surrounded by a nuclear envelope with pores
- Chloroplasts (plant only) contain chlorophyll and are the site of photosynthesis; central vacuole (plant only) maintains turgor pressure
A student is shown a cell with a large central vacuole, a cell wall, and chloroplasts. They are asked to identify whether this is a plant or animal cell and justify their answer using two pieces of evidence.
The correct answer is a plant cell. The student should cite the presence of chloroplasts (for photosynthesis) and the large central vacuole as plant-specific organelles. Animal cells lack both of these structures, making them reliable identifiers on an exam.
2 Cell Membrane
Students must understand the fluid mosaic model, which describes the cell membrane as a phospholipid bilayer embedded with proteins. The membrane is selectively permeable, meaning it controls what enters and exits the cell. Knowing the roles of phospholipids, cholesterol, and membrane proteins is essential.
Key Points
- Phospholipids have a hydrophilic (water-loving) head and hydrophobic (water-fearing) tail; they self-arrange into a bilayer
- Cholesterol stabilizes membrane fluidity, keeping it from being too rigid or too fluid
- Membrane proteins serve as channels, carriers, receptors, and cell identity markers (glycoproteins)
- Selective permeability allows small nonpolar molecules (O₂, CO₂) to pass freely; ions and large molecules require proteins
Which molecule can pass directly through the phospholipid bilayer without assistance: glucose, oxygen, sodium ions, or a protein?
The correct answer is oxygen (O₂). Oxygen is a small, nonpolar molecule and can diffuse freely through the hydrophobic core of the bilayer. Glucose is large and polar, sodium ions are charged, and proteins are far too large — all three require transport proteins to cross the membrane.
3 Prokaryotes Vs Eukaryotes
Students must be able to distinguish prokaryotic cells (bacteria) from eukaryotic cells (plants, animals, fungi) based on key structural differences. The most important distinction is that prokaryotes lack a membrane-bound nucleus. This topic is commonly tested through comparison tables or cell diagrams.
Key Points
- Prokaryotes: no membrane-bound nucleus, no membrane-bound organelles, smaller (1–10 µm), circular DNA in nucleoid region
- Eukaryotes: have a membrane-bound nucleus, membrane-bound organelles, larger (10–100 µm), linear DNA on chromosomes
- Both types have a cell membrane, ribosomes, cytoplasm, and DNA
- Bacteria are prokaryotes; plants, animals, fungi, and protists are eukaryotes
A scientist examines a cell under a microscope and observes that it has ribosomes and DNA but no distinct nucleus or mitochondria. Is this cell prokaryotic or eukaryotic? Explain.
The cell is prokaryotic. The absence of a membrane-bound nucleus is the defining feature of prokaryotes. While both cell types have ribosomes and DNA, the lack of a nucleus and other membrane-bound organelles like mitochondria confirms this is a prokaryotic cell, such as a bacterium.
4 Cell Transport
Students must understand how substances move across the cell membrane, including passive transport (no energy required) and active transport (energy required). Knowing the direction of movement relative to concentration gradients is critical. Osmosis questions involving tonicity are among the most commonly tested.
Key Points
- Diffusion: movement of molecules from high to low concentration (down gradient); passive, no ATP needed
- Osmosis: diffusion of water across a semipermeable membrane from high water concentration (low solute) to low water concentration (high solute)
- Active transport: moves substances against the concentration gradient (low to high); requires ATP and carrier proteins
- Tonicity: hypertonic solution causes cells to shrink (lose water); hypotonic solution causes cells to swell; isotonic solution — no net water movement
A red blood cell is placed in a solution that is more concentrated in solutes than the cell's interior. Predict what will happen to the cell and explain why.
The cell will shrink (crenate) because the surrounding solution is hypertonic. Water moves by osmosis from the area of higher water concentration (inside the cell) to lower water concentration (outside the cell) until equilibrium is reached. This is passive transport — no energy is needed because water follows its concentration gradient.
Questions, answered.
What is Cell Biology?
Cell Biology is Unit 2 of Biology, covering cell organelles, cell membrane, prokaryotes vs eukaryotes and cell transport.
How to study for Biology Unit 2?
Start with the Quick Summary above, review the Key Concepts, then test yourself with our interactive study games. Aim for 80%+ accuracy before moving on.
How many questions are in this unit?
This unit has 28+ review questions across 5 different game modes.