Biology Quiz Chapter 2

The element oxygen (O) has six electrons in its outermost shell. How many covalent bonds will O readily form?

• none

• one

• two

• three

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An electronegative atom:

• has a great attractive force for electrons.

• has a great attractive force for protons.

• repels electrons.

• repels neutrons.

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The chloride ion has an extra electron relative to the number of protons in its nucleus. Thus, chloride:

• has a negative charge.

• has lost an electron.

• can bind a cation.

• has a negative charge and can bind a cation.

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Polar molecules of biological importance may often:

• contain one or more electronegative atoms.

• contain one or more electropositive atoms.

• possess strongly polarized bonds.

• contain one or more electronegative atoms and possess strongly polarized bonds.

Ionic bonds:

• are attractions between fully charged ions.

• are of limited importance in living cells because of the prevalence of water.

• are always weak.

• All of these statements are true.

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Which of the following statements about hydrogen bonds is true?

• They can occur between most polar molecules.

• They are weak attractive interactions.

• They can be found between the two strands of a DNA molecule.

• All of these statements are correct.

Which of the following is NOT a property of water?

• It is an essential nutrient.

• It is a highly asymmetric molecule.

• It is composed of two polar covalent bonds.

• All three atoms in a water molecule can form hydrogen bonds.

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The four major biological macromolecules are:

• carbohydrates, lipids, proteins, and nucleic acids

• carbohydrates, lipids, amino acids, and nucleic acids

• amino acids, carbohydrates, lipids, and DNA

• amino acids, glucose, lipids, and nucleic acids

Particular groupings of atoms that often behave as a unit and give organic molecules their physical properties, chemical reactivity, and solubility in aqueous solutions are known as:

• amphipathic groups

• idiosyncratic groups

• functional groups

• aspirational groups

In addition to functioning as stores of chemical energy, carbohydrates:

• are important in cellular metabolism.

• can serve as strong building materials for biological construction.

• can be highly water soluble.

• All of these.

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