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Past biochem exam Qs
| Question | Answer |
|---|---|
| A protein called the sodium–potassium pump pushes potassium ions into the cell. This requires ATP, the biological form of energy. What process is this describing? Osmosis, diffusion, facilitated transport, or active transport? | ACTIVE TRANSPORT |
| Potassium ions can also “leak” back through neuron cell membranes via different proteins, allowing them to move from the inside of the cell to outside of the cell. What process is this describing? | FACILITATED |
| Explain in ≤1 sentence why proteins are involved in the previous two questions. Why can’t potassium ions travel directly through cell membranes? | Cell membranes are largely nonpolar, and do not permit charged ions to travel through (ions make much more favorable interactions with water than with the hydrophobic tails |
| Potassium can be ingested in the form of potassium citrate, K3C6H5O7. Is potassium citrate a strong, weak, or non-electrolyte? | Strong |
| What is a major similarity between the reaction of a strong acid (HNO3) and water compared to the reaction of a weak acid (NH4+) and water? | Both produce H3O+ when they react with water, along with their conjugate base |
| What is a major difference between the reaction of a strong acid with water compared to the reaction of a weak acid in water? | The strong acid strongly favors products (K >1), while the weak acid favors reactants (K < 1) |
| What is the conjugate base of NH4+? | NH3 |
| In the blood (at pH = 7.4), which form predominates: the charged or the uncharged form? | pH < pKa so acidic form predominates |
| Is calcium carbonate a strong or weak base? | weak |
| how would u do a problem like this: If you have 0.450 L of a solution labeled “1.5 M KCl,” what will the % (g/mL) of that solution be? | Molar mass of KCl = 74.5 g/mol 0.450 L x 1.5 mol/L x 74.5 g/mol = 50.3 grams 0.450 L x 1000 mL/1 L = 450 mL 50.3 g/450 mL x 100% = 11% |
| Is CO2 a strong, weak, or non-electrolyte? | non-electrolyte |
| How does CO2 pass through cell membranes? Osmosis, passive diffusion, facilitated transport, or active transport? | passive |
| A soda containing CO2 bubbles in water goes flat more quickly in a warm room than a cold one. | Solubility of CO2, a gas, decreases with increasing temperature, so in a warm room, CO2 is less soluble in water and leaves the water faster |
| A diver has more nitrogen gas in her blood at high pressure than at the surface (which is lower in pressure). | Nitrogen gas is more soluble in water at higher pressures as compared to lower pressures, so the diver would have more gas soluble in her blood at high pressure |
| If the value of K is 0.021 at 720 K, which would predominate at that temperature, HI or H2 and I2? | HI, because if the K is smaller than 1, the reactants are favored |
Created by:
liladdoyle