worksheet%204%20-%20KEY - NAME _ BIO 311C Discussion...

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NAME ____________________ BIO 311C Discussion Worksheet Membranes and Cell Communication 1a. What are glycoproteins and glycolipids? GLYCOPROTEIN: PROTEIN COVALENTLY ATTACHED TO A SHORT CARBOHYDRATE (OLIGOSACCHARIDE) GLYCOLIPID: LIPID COVALENTLY ATTACHED TO A SHORT CARBOHYDRATE (OLIGOSACCHARIDE) 1b. What is the main function of membrane glycoproteins and glycolipids ? CELL-CELL RECOGNITION 1c. On which side of the plasma membrane are you most likely to find glycoproteins and glycolipids? EXTRACELLULAR (OUTER) SIDE OF PLASMA MEMBRANE 2. Molecules diffuse down their concentration gradient until they are equally distributed. Describe what happens to molecule movement at this point. ( DYNAMIC EQUILIBRIUM) MOLECULES CONTINUE MOVING, BUT THERE IS NO NET DIRECTION OF MOVEMENT (MOVEMENT IN ONE DIRECTION EQUALS MOVEMENT IN OPPOSITE DIRECTION). 3. What will happen to a plant cell placed in a hypotonic environment? Hypertonic environment? HYPOTONIC: CELL IS TURGID (WATER IN) HYPERTONIC: CELL PLASMOLYZES (WATER OUT) 4. List two differences between facilitated diffusion and active transport. FACILITATED DIFFUSION
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worksheet%204%20-%20KEY - NAME _ BIO 311C Discussion...

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