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Which of the following sugars is the sugar found in deoxyribonucleotides? |
deoxyribose |
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Enter the name of the pentose sugar found in DNA. |
deoxyribose |
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Name the four nitrogenous bases that occur in DNA. |
adenine,cytosine,guanine,thymine |
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Identify three possible components of a DNA nucleotide. |
deoxyribose, phosphate group, thymine. DNA and RNA have similar structures: a pentose sugar with a nitrogenous base and a phosphate group. DNA and RNA differ in the type of pentose sugar each possesses (DNA has deoxyribose; RNA has ribose) and in one base (DNA has thymine; RNA has uracil). |
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In a nucleic acid polymer, the hydrogen bonds that help to hold regions of double-strandedness together occur between what parts of the nucleotide monomers? |
nitrogenous bases |
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DNA is composed of building blocks called _____. |
nucleotides. DNA is a composed of nucleotide units. |
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In eukaryotic cells DNA has the appearance of a _____. |
double helix. Eukaryotic DNA is organized as a double helix. |
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Write the complementary sequence for the following DNA sequence, in order from 3′ to 5′: |
5′ – CGATATTGAGCTAAGCTT – 3′, 3′ – GCTATAACTCGATTCGAA – 5′ |
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If a segment of DNA contains 28 percent T nucleotides, then the percentage of A nucleotides in that segment will be _____. |
28 percent |
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In a DNA double helix, the chemical bonds that form between the complementary nitrogenous bases are _____. |
hydrogen bonds |
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Which statement concerning the DNA double helix is correct? |
Base pairing allows production of identical daughter molecules.Complementary base pairing is the chemical interaction that underlies the replication of genetic information stored in DNA. |
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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′ |
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Adenine pairs with thymine and guanine pairs with cytosine. If a DNA double helix is 100 nucleotide pairs long and contains 25 adenine bases, how many guanine bases does it contain? |
75. 100 nucleotide pairs are a total of 200 nucleotides. Because of base pairing, if there are 25 adenine there must also be 25 thymine. This leaves 200-50 = 150 nucleotides to be divided evenly between guanine and cytosine. |
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The two strands of a DNA double helix are held together by _____ that form between pairs of nitrogenous bases. |
hydrogen bonds. Nitrogenous base pairs are joined by hydrogen bonds. |
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A nucleotide is composed of a(n) _____. |
phosphate group, a nitrogen-containing base, and a five-carbon sugar |
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