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Exam 2: Chemistry of Life

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Question 1

Multiple Choice

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We use soap to clean ourselves better than we could with water alone.Soaps contain phospholipids that are responsible for the cleansing action.Which of the following statements is the most likely explanation for how soaps work?

A) Phospholipids are ions and therefore mix with both the water and oily dirt.
B) Phospholipids are completely hydrophilic,and therefore oily dirt takes the place of the phospholipid molecules that would be dissolved in the rinse.
C) The phospholipid tail attaches to the oily dirt while the phospholipid head interacts with the rinse water and carriers the dirt (and soap) away with it.
D) The nonpolar fatty acid chains that make up the heads of the phospholipid are hydrophilic,and thus are repelled by the water.

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C

Question 2

Multiple Choice

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Which of the following distinguishes ionic bonds from covalent bonds?

A) Ionic bonds form between the same two elements,whereas covalent bonds form between different elements.
B) Ionic bonds hold together compounds that do not dissolve in water,whereas covalent bonds hold together molecules that dissolve in water.
C) Ionic bonds hold together oppositely charged atoms,whereas covalent bonds hold together atoms that share electrons.
D) Ionic bonds consist of atoms with partial charges,whereas covalent bonds consist of atoms with full positive and negative charges.

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Question 3

Multiple Choice

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If iodide ions (I⁻) were dissolved in water,they would be attracted to

A group of astronauts returning from outer space studied samples taken from their lunar landing.They found that one of their samples was coated with organic compounds.Which of the following statements must be correct about their samples?

A disaccharide consists of two

Carbon atoms are bound to each other by

Which of the following is a monomer that can be commonly made from components in Earth's atmosphere?

Macromolecules are typically formed by repetitively adding small monomers together.Which macromolecule is properly matched with the appropriate monomer?

How many atoms are present in a single molecule of C₈H₁₀N₄O₂?

Individual water molecules orient toward each other because of the ________ bonds that form between them.

Based on the water molecule pictured below,which of the labeled areas possesses a partial negative charge?

Nitrogen has seven protons,seven neutrons,and seven electrons.What is the atomic mass of nitrogen?

The chemical reaction that represents photosynthesis is 6 H₂O + 6 CO₂ → C₆H₁₂O₆ + 6 O₂.What are the reactants?

Carbon,hydrogen,and nitrogen are all examples of

The class of macromolecules that do NOT form true polymers are the ________.

MATCHING Using the answer choices below (a through d) , match the characteristic with its macromolecule class. -used to create steroid molecules like cholesterol

Which of the following is the largest in size?

Your supervisor provides you with lipids,carbohydrates,proteins,and nucleic acids and asks you to determine their chemical components.Which of the following elements would you NOT expect to find in these items?

A carwash attendant offers to treat your windshield with a protective agent.This substance coats the glass,causing beads of water to easily roll off during a rain shower.Which of the following must be correct about the protective agent?

During a study session,a Biology classmate holds up a bottle of water and mentions that there are both hydrogen bonds and covalent bonds found within the liquid.Explain your classmate's statement by describing the types of bonds that are found within your bottle of water.