Large Molecules โดย Invisible Man ( ควิซทดสอบ )

1 Which arrow points to a peptide bond?

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1

3

2 and 3

2

4 and 5

2 The structure on the left is a(n) _________________, and the structure on the right is a(n)_________________.

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carbohydrate, amino acid

carbohydrate, lipid

lipid, polypeptide

nucleotide, carbohydrate

nucleotide, amino acid

3 The tertiary structure of a protein refers to the:

Presence of alpha-helices or beta-sheets

Unique three dimensional folding of the molecule

Sequence of amino acids

Interaction of a protein with a nucleic acid

Interactions of a protein with other subunits of enzymes

4 The structure shown in the diagram is an example of:

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a protein.

RNA.

a lipid.

a polysaccharide.

DNA.

5 Which statement is true concerning the structure of proteins?

Alpha helices and beta sheets are examples of secondary structure.

Side chains (R-groups) of amino acids can be hydrophilic or hydrophobic.

The primary structure is the sequence of amino acids.

Proteins made of two or more polypeptide chains have quaternary structure.

All statements are true.

6 The structure shown in the diagram is an example of a monomer unit used in the formation of:

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DNA

lipid

polysaccharides

RNA

protein

7 Two macromolecules, such as proteins, can adhere tightly and specifically to each other. How can weak forces lead to such strong adherence?

the weak forces are readily converted to covalent bonds, thus leading to strong adherence between molecules

if the weak forces are correctly aligned they can become as strong as covalent bonds

the weak forces can become very strong once non-polar groups are excluded from the inside of the molecules

adherence can be quite strong by having many weak forces involved in molecular adhesion

adhesion is strong because the weak forces can be involved in condensation reactions

8 The structure shown in the diagram is an example of:

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DNA.

a lipid.

a polysaccharide.

RNA.

a protein.

9 Which amino acid has a hydrophobic side chain?

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Asparagine

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Isoleucine

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Glutamic acid

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Glycine

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Threonine

10 A polypeptide 5 amino acids long is split into various smaller fragments include: his-gly-ser, ala-his, and ala-ala. Predict the primary sequence of the polypeptide.

cannot be determined without more information.

ala-his-gly-ser-ala

ala-ala-his-gly-ser

his-gly-ser-ala-ala