BIOL
Key-1308 Homework 2.docx

D the soap is converted into a lipid that binds to

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D) The soap is converted into a lipid that binds to the dirt/oil while repelling the water. Answer: C You have curly hair, and your brother has straight hair. Describe how the proteins of your curly hair are different from the proteins of his straight hair. (2’) Answer: 1. The keratin proteins in your curly hair have disulfide bonds in certain locations that cause the keratin to have bends or curls. 2. The disulfide bonds in your brother's straight hair are in locations that don't cause bends in the keratin, so there are no curls. How do two amino acids, such as lysine and methionine, differ from each other? (2’) Answer: They have different functional (or "R") groups. OR: Methionine is hydrophobic, lysine is polar Or: Met has sulfur group, lysine has 2 amino groups Why is it an advantage for animals that migrate long distances to store energy as lipids rather than carbohydrates? (2’) Answer: Lipids (fats) store more than twice as much energy as carbohydrates. All animals need oxygen gas (O 2) for their primary cellular-level functioning. Inside the cell, O 2 is split apart into oxygen atoms. Eventually, electrons that are flowing through the cell will be "received" by this oxygen. But first, the electrons combine with protons present in the cell to form a basic element that has a single proton and a single electron. Then this element combines with the oxygen to form a certain chemical compound. In this scenario, what chemical compound is produced when this element combines with oxygen? (2’) Answer: H 2 O
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  • Fall '18
  • cilia

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