CHEM 115 Final Review from Quizzes

The boiling points of alkanes increase with molar mass because of the increase in what?

London dispersion forces

In the Fischer projection of a carbohydrate, the wedges and dashes are represented by what respectively?

horizontal lines, vertical line

Wha type of attractive forces are the only ones that all molecules have regardless of composition or poarity?

London dispersion forces

In a lipid bilayer:

the hydrophobic tails of the molecules point toward each other

Which of these alkanes has the lowest boiling point?

C4H10

C8H18

C6H14

C2H6

C2H6

A carbohydrate with a ketone functional group is called:

ketose

Which of the following compounds cannot exhibit hydrogen bonding?

H2O

CH4

HF

NH3

CH4

A molecule that contains both polar and non-polar regions is describe as:

amphipathic

How many monosaccharides are connected to each other in an oligosaccharide?

3-9

A carbohydrate that contains seven monosaccharide groups is an oligosaccharide. True or False

True

Hydrogen bonding is a special form of:

dipole-dipole attractions

What happens during condensation?

the gas state is turned directly into the liquid state

Which of the following is a disaccharide?

Glucose

Starch

Mannose

Sucrose

Sucrose

The transition from the gas phase directly to the sold phase is called what?

deposition

A Bronsted-Lowry acid is defined as a substance which:

acts as a proton donor in any system

What is the [H3O+] concentration of a solution that has a pH=11.61

2.5 × 10^-12

To prevent the process of either crenation or hemolysis with red blood cells an intravenous solution concentration should be what compared to the concentration of blood?

isotonic

Which can serve as the solvent in a solution?

gases, liquids and solids can all serve as solvents

In a solution, the solvent is:

the substance in the greatest amount

A solution of sucrose (table sugar) and water does not conduct electricity. Due to this property, sucrose is classified as a?

non-electrolyte

A Bronsted-Lowry base accepts protons. True or False?

True

What is the conjugate base of OH-?

O2-

You have been given an unknown liquid that is soluble un water but not in benzene (a nonpolar solvent). From this information, you can infer that the unknown liquid is:

polar

A saturated solution:

contains dissolved solute in equilibrium with undissolved solid

In a solution, the solute is:

the substance that is dissolved

Which of the following properties is NOT a characteristic of an acid?

produces H+ in water

is neutralized by a base

has a slippery feel

has a sour taste

has a slippery feel

What is the conjugate acid of HS-?

H2S

A Bronsted-Lowry acid acepts protons. True or False?

False

The second step of protein synthesis occurs in the ribosomes and is called what?

translation

How many different amino acids can combine to form human proteins?

20

Identify the base not found in DNA

Uracil

The complementary base of cytosine is:

Guanidine

A molecule that is similar in terms of the correct structure to the substrate for an enzyme will probably be a:

competitive inhibitor

complementary base pairs are held together by:

hydrogen bonds

Corn is an incomplete protein because it lacks one or more:

essential amino acids

A nucleoside consists of a:

pentose + nitrogenous base

The base pairs guanine and cytosine form how many hydrogen bonds wih each other?

3

The interaction of the side chains on the amino acids, for example hydrophobic attractions, is the _______ structure of a protein.

tertiary

What is the primary function of enzymes?

Biochemical catalysts

When a molecule binds to an enzyme at a site other than the active site and affects enzyme shape it is called what?

noncompetitive inhibitor