BIOL005A Midterm 1

1) T or F: Breaking bonds is endothermic

• True
• False

2) T or F: Liquid water is less dense than ice, and that is why ice floats on water, a fundamental idea of biology.

• True
• False

3) Water dissolves which of the following molecules:

• Hydrophilic
• Polar
• Ions
• Small alcohols
• Hydrophobic

4) In terms of intermolecular forces, while a simple alkane has _____________, water molecules have __________.

• hydrogen bonding, ionic bonding
• van der waals interactions, hydrogen bonding
• covalent bonding, hydrogen bonding
• covalent bonding, ionic bonding

5) Miscible is synonymous to what?

• hydrophobic
• hydrophilic

6) Which macromolecule is not a true polymer?

• Carbohydrates
• Lipids
• Proteins
• Nucleic Acids

7) What is the net charge of an atom with 16 protons, 16 neutrons, and 18 electrons?

• -2
• -1
• 0
• 2

8) Which is a hydrogen bond?

• A
• B
• C
• D
• E

9) If an uncharged atom has 12 protons, how many electrons are in its valence shell?

• 2
• 4
• 6
• 8

10) What is the difference between an aldehyde and a ketone?

• carbonyl : carboxylic acid
• C-O : C=O
• saturated : unsaturated
• on end of molecule: within molecule