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Pick the reason that is least likely to explain why two purines will never be seen attached to each other in a DNA helix.
DNA strands are composed of millions of nucleotides. As a result, it would be virtually impossible to find a single strand that did not have all four nucleotides.
Nucleotides combine in purine-pyrimidine pairs due to the sterically appropriate fit of the bases, as well as the preferred combination of hydrogen bonds between the two nucleotides. As a result, two purines would not be seen combined. This is due to both being too large when together, and the incorrect hydrigen bonding between their functional groups.
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Which of the following is not true of nucleic acids?
DNA and RNA share very similar structures, with two primary differences: DNA lacks a hydroxide group on the 2' carbon of the ribose sugar and RNA uses uracil in place of thymine.
Both DNA and RNA have phosphate groups attached to the 5' carbon of the sugar, which can be joined to the 3' carbon of an adjacent nucleotide by a phosphodiester bond. As a result, both RNA and DNA are read in the 5'-to-3' direction.
Adenosine triphosphate (ATP) and guanosine triphosphate (GTP) are derived from adenine and guanine, two of the fundamental nitrogenous bases in nucleic acids, making them nucleic acid derivatives.
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What is the main difference between DNA nucleotides and RNA nucleotides?
The correct answer is that RNA nucleotides have two hydroxide groups on the sugar, whereas DNA nucleotides have only one hydroxide group. RNA uses uracil in place of thymine; not DNA. Both DNA and RNA have five-carbon sugars and are bound together along the backbone by phosphodiester bonds. Though base pairing is more common in DNA (double-stranded RNA is less common), both utilize hydrogen bonding.
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Which of the following are components of a nucleotide?
I. Nitrogenous base
II. Glucose sugar
III. Ribose sugar
IV. Three sulfates
V. Three phosphates
A nucleotide consists of a nitrogenous base (adenine, guanine, cytosine, thymine, or uracil), a pentose sugar (either ribose or deoxyribose), and three phosphates. These nucleotide monomers can be strung together via phosphodiester linkages to form a polynucleotide. This polynucleotide can base pair with another polynucleotide through hydrogen bonding to form double-stranded DNA.
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