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Question

What do fats, steroids, and waxes have in common?

(a) Moderate polarity.

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(b) Low solubility in water.

(c) They occur in membranes.

Both (a) and (c).

Both (b) and (c).

Dr. Haxton told one of his students, “To move in the bloodstream, fats need the help of phospholipids.” What would a good student say?

Yes. Nonpolar molecules aren’t compatible with water.You have it backwards. Fats help phospholipids to travel.

Sorry, Dr. Haxton! Help comes from cholesterol, not phospholipids.

Not so. Fats are small enough to travel easily without help.

Right. Fats are too polar to travel alone in water.

Proteins differ from one another because __________.

the peptide bonds linking amino acids differ from protein to protein

the number of nucleotides found in each protein varies from molecule to molecule

the sequence of amino acids in the polypeptide chain differs from protein to protein

each protein contains its own unique sequence of sugar molecules

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Proteins are polymers of __________.enzymesfatty acidssugarsamino acids

How many amino acids are found in living organisms?

20

64

10

30

The carboxyl group of an amino acid is composed of __________.

COOHCHan R group signifying the proteinNH2

The amino group of an amino acid is composed of __________.

COOH

NH2

CH

an R group signifying the protein

The R group of an amino acid is also called the __________.

side chain

NH2

carboxyl group

CH

This animation illustrates the functioning of a _____ protein.

transport

contractilereceptor

structural protein

gene regulatory

Arrow A is indicating a(n) _____ protein.

transport

structural

enzymesignal

receptor

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Arrow D is indicating a _____ protein. receptordefensivestoragegene regulatorytransportWhich of these does NOT contain a structural protein?ovalbuminmusclestendonsspider silkligaments

Defensive proteins are manufactured by the _____ system.

integumentary

Immune

cardiovascular

digestive

nervous

If a strand of DNA has the nitrogen base sequence 5′-ATTTGC-3′, what will be the sequence of the matching strand?

3′-TAAACG-5′

3′-ATTTGC-5′

3′-UAAACG-5′

3′-TUUUCG-5′

3′-GCAAAT-5′

If a DNA double helix is 100 nucleotide pairs long and contains 25 adenine bases, how many guanine bases does it contain?

50

25

150

75

200

The two strands of a DNA double helix are held together by _____ that form between pairs of nitrogenous bases.

hydrogen bonds

covalent bonds

ionic bondshydrophilic interactions

S—S bonds

A nucleotide is composed of a(n) _____.

amino group, a nitrogen-containing base, and a five-carbon sugar

phosphate group, a nitrogen-containing base, and a five-carbon sugar

phosphate group, a nitrogen-containing base, and a hydrocarbon

sulfhydryl group, a nitrogen-containing base, and a five-carbon sugar

glycerol, a nitrogen-containing base, and a five-carbon sugar

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