Macromolecules and Biological Polymers Worksheet

A subatomic particle with a positive charge is_________.

• an ion

• a neutron

• an isotope

• a proton

• an electron

Sodium has 11 electrons arranged in three energy levels. In order to become stable, sodium forms an ion that contains

• no charge.

• -1 charge.

• -8 charge.

• +1 charge.

• +8 charge.

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Because oxygen is more electronegative than hydrogen, the water molecule is

• ionic.

• hydrophilic.

• polar.

• hydrophobic.

• nonpolar.

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Water molecules are attracted to each other due to the opposite charges created by partial charge separations within the molecules. These attractions are called

• covalent bonds.

• hydrogen bonds.

• peptide bonds.

• double bonds.

• ionic bonds.

These biological compounds are nonpolar and insoluble in water

• carbohydrates.

• nucleic acids.

• proteins.

• lipids.

A DNA molecule containing 32% thymine would contain how much cytosine?

• 64%

• 36%

• 32%

• 18%

This atom in its unbound state has four valence electrons. These electrons readily form single, double, and even triple bonds among themselves to become stable. This atom is

• phosphorus.

• hydrogen.

• nitrogen.

• carbon.

• oxygen.

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Macromolecules that are used by all organisms to store hereditary information are called

• ribosomal RNA molecules.

• messenger RNA molecules.

• proteins.

• transfer RNA molecules.

• DNA molecules.

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DNA and RNA contain functional units known as

• nucleotides.

• amino acids.

• enzymes.

• peptides.

• fatty acids.

Carbohydrates are polymers formed from structural units called

• amino acids.

• monosaccharides.

• nucleotides.

• fatty acids.

• glycerols.