BIOS 260 Quiz 2 - –Answer - contribute a negative charge to the...

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BIOS 260 Quiz 2

• If the side chains of amino acids contain carboxyl (-COOH) groups, they

–Answer

• contribute a negative charge to the amino acid at pH 10 AND are considered acidic amino

acids

• The characteristic common to all lipids is their

–Answer solubility in organic solvents AND hydrophobic nature.

• Dan is a body builder. He decides that he is going to change his diet in an effort to

increase his muscle mass. Dan tells you that he plans to eat vegetables and proteins but no fats or carbohydrates, because cells do not naturally contain these molecules and do not need them. You advise Dan that his new diet is not a good choice, and that he would do better to follow a well balanced diet that incorporates healthy amounts of proteins, fats AND carbohydrates.Dan asks you how his cells are able to use complex molecules such as proteins. You explain to him that proteins are macromolecules composed of and that proteins can be broken down by , a type of reaction in which the addition of breaks covalent bonds between subunits.–Answer amino acid; hydrolysis; water

• The sugars found in nucleic acids contain

–Answer

• carbon atoms
• In general, when saturated fats are compared to unsaturated fats (assuming the same number of

carbon atoms in the molecule), –Answer unsaturated fats have a lower melting temperature.

• Water-soluble substances easily pass through the phospholipid bilayer of a cell membrane.

–Answer False

• Phospholipids are polar molecules.

–Answer 1 / 2

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True

• If the side chains of amino acids contain carboxyl (-COOH) groups, they

–Answer

• contribute a negative charge to the amino acid at pH 10 AND are considered acidic amino

acids.

• The atom, as a whole, is uncharged because

–Answer the number of protons equals the number of electrons.

• Atoms that gain electrons become

–Answer negatively charged

• The most important molecule(s) in the world is (are)

–Answer Water

• Dan is a body builder. He decides that he is going to change his diet in an effort to

increase his muscle mass. Dan tells you that he plans to eat vegetables and proteins but no fats or carbohydrates, because cells do not naturally contain these molecules and do not need them. You advise Dan that his new diet is not a good choice, and that he would do better to follow a well balanced diet that incorporates healthy amounts of proteins, fats AND

carbohydrates.Dan tells you that he knows proteins are needed to build muscle mass but that he doesn't quite understand the role of proteins in a cell. He tells you five things he believes proteins are needed for in cell function, but he is mistaken on one of these. Which of the following statements regarding the role of proteins in cells is INCORRECT?

• Proteins catalyze chemical reactions within cells.
• Proteins provide structural support in cells (cytoskeleton).
• Proteins are involved in movement of certain cells.
• Proteins are involved in transporting molecules into or out of cells.
• Proteins are a major component of starch.

–Answer Proteins are a major component of starch.

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