CH.5 Flashcards

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1
Q

if a DNA sample were composed of 10% thymine, what would be the % of guanine?

A

40%

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2
Q

which of the following description best fits the class of molecules known as nucleotides

A

a nitrogenous base, a phosphate group, and a pentose sugar

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3
Q

which of the following pairs of base sequences could form a short stretch of a normal double helix of DNA

A

5’-A-T-G-C-3’ with 5’-G-C-A-T-3’

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4
Q

enzymes that break down DNA catalyze the hydrolysis of the covalent bonds that join nucleotides together. what would happen to DNA molecules treated with these enzymes?

A

the phosphate linkages between deoxyribose sugars would be broken

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5
Q

which of the following are nitrogenous bases of the purine type?

A

guanine and adenine

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6
Q

a new organism is discovered in the forests of Costa Rica. Scientist there determine that the polypeptide sequence of hemoglobin from the new organism has 72 aa differences from humans, 65 differences from a gibbon, 49 differences from a rat, and 5 differences from a frog. This data suggest that the new organism

A

is more closely related to a frog than to humans

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7
Q

of the following function, the major purpose of RNA is to

A

function in the synthesis of protein

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8
Q

if a DNA sample were composed of 10% thymine, what would be the percentage of guanine?

A

40%

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9
Q

which of the following best describes the flow of info in eukaryotic cells?

A
  • DNA —> RNA—> proteins
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10
Q

if one strand of a DNA molecule has the sequence of bases 5’ATTGCA3’, the other complementary strand would have the sequence

A

3’TAACGT5’

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11
Q

what is the structural feature that allows DNA to replicate?

A

complementary pairing of the nitrogenous bases

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12
Q

a double stranded dna molecule contains a total of 120 purines and 120 pyrimidines. This DNA molecule could be composed of

A

120 thymine and 120 adenine molecules

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13
Q

which of the following statements about the 5’ end of a polynucleotide strand of dna is correct

A

the 5’ end has a phosphate group attached to the number 5 carbon of ribose

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14
Q

In the double helix structure of nucleic acids, cytosine hydrogen bonds to

A

guanine

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15
Q

which of the following statements best summarizes the structural differences between dna and rna

A

dna nucleotides contain a different sugar than RNA nucleotides

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16
Q

which of the following store and transmit hereditary info

A

nucleic acids

17
Q

the difference between the sugar in dna and the sugar in rna is that the sugar in dna

A

contains one less O atom

18
Q

which of the following are nitrogenous bases of the pyrimidine type?

A

cytosine and uracil

19
Q

which of the following is an example of hydrolysis

A

the reaction of a fat, forming glycerol and fatty acids with the utilization of water

20
Q

DNAase is an enzyme that catalyzes the hydrolysis of the covalent bonds that join nucleotides together. what would 1st happen to DNA molecules treated with DNAase?

A

the phosphodiester bonds between deoxyribose sugars would be broken.