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________ are small oligonucleotides,20-30 nucleotides in length,that bind specifically to mRNA and stop translation.

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Which of the following is a terpene?


A) testosterone
B) vitamin A
C) glycerol
D) phenanthrene
E) dolichol

F) A) and D)
G) C) and E)

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Which of the following is true of fatty acids?


A) Fatty acids are synthesized by the stepwise addition of three carbon units.
B) Unsaturated fatty acids are usually branched.
C) Fatty acids with 24 carbons are most common.
D) Saturated fatty acids have no double bonds between carbons.
E) Laurate is an unsaturated fatty acid.

F) B) and C)
G) A) and E)

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________ is the major storage polysaccharide for animals,while ________ is the major storage polysaccharide for plants.

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5'-ATAGGGCTT-3' is a short sequence of a strand of DNA.What will be the complementary sequence of the other strand? What will be the complementary mRNA sequence derived from the second strand of DNA? Be sure to indicate the 5' or 3' ends of each sequence.

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Complementary DNA: 3...

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Which of the following is true of transfer RNA?


A) It serves as the site of protein synthesis.
B) It is an important component of ribosomes.
C) It is responsible for the correct positioning of amino acids in a polypeptide.
D) It functions in replication only.
E) It is responsible for the correct positioning of amino acids in a nascent polypeptide.

F) A) and E)
G) D) and E)

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Hydrogen bonding is most important in stabilizing the ________ structure of many proteins.


A) primary
B) secondary
C) tertiary
D) quaternary
E) all of the above

F) B) and E)
G) A) and D)

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For the amino acid glutamine,the three-letter abbreviation is ________ and the one-letter is ________.

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gln; Q

Small RNA molecules that specifically down-regulate expression by binding to the appropriate mRNA molecule and inhibit translation are


A) mRNAs.
B) siRNAs.
C) tRNAs.
D) rRNAs.
E) miRNAs.

F) C) and D)
G) A) and B)

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E

Nucleotides are to nucleic acids as amino acids are to ________.

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Fibrous proteins have extensive ________ structure,which allows them to be highly ordered and repetitive.


A) primary
B) secondary
C) tertiary
D) quaternary
E) multiprotein complex

F) B) and E)
G) B) and D)

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Which of the following is not a polymer of numerous monomer units?


A) lipids
B) proteins
C) nucleic acids
D) carbohydrates
E) starch

F) A) and B)
G) None of the above

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Which of the following is an example of a defensive protein?


A) cell surface receptor
B) antibody
C) hormone
D) myosin
E) keratin

F) A) and B)
G) B) and C)

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The nucleoside triphosphate molecules in DNA are linked together in the 5'→3' by a(n) ________ bridge.


A) phosphate
B) covalent
C) phosphodiester
D) peptide
E) phosphatidyl

F) C) and D)
G) A) and B)

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Match the choice on the left with the choice on the right.

Premises
Haworth projection
multimeric complex
monomer of protein
nucleotide
an example of a globular protein
polymer of glucose
pyrimidine
Responses
spatial structure
monosaccharide
steroids
quaternary structure
linear structure
ribonuclease
starch
adenine
amino acid
cytosine
AMP
guanine
collagen

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spatial structure
monosaccharide
steroids
quaternary structure
linear structure
ribonuclease
starch
adenine
amino acid
cytosine
AMP
guanine
collagen

Which of the following is a nonpolar (hydrophobic) amino acid?


A) valine
B) serine
C) tyrosine
D) lysine
E) aspartate

F) A) and E)
G) A) and D)

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Which of the following has the greatest number of glycosidic bonds?


A) glucose
B) triacylglycerol
C) amylose
D) DNA
E) vitamin A

F) A) and B)
G) A) and D)

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Trans fats


A) are unsaturated fatty acids.
B) resemble saturated fatty acids in shape.
C) are associated with an increased risk of heart disease.
D) are present in small amounts in meat and dairy products.
E) all of the above

F) C) and D)
G) B) and C)

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Starch,cellulose,and glycogen are all polysaccharides composed of glucose.What makes each of these polysaccharides unique in spite of the fact that all are composed solely of glucose?

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Starch: is produced by plants and is a n...

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Cellulose belongs to which of the following groups of macromolecules?


A) lipids
B) carbohydrates
C) proteins
D) nucleic acids
E) none of the above

F) B) and C)
G) A) and E)

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B

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