Which of the following describes a difference between DNA and RNA? 7. The two st

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Which of the following describes a difference between DNA and RNA? 7. The two strands of a DNA molecule are held together through hydrogen bonds between nucleotide bases. Which of the following best describes this base pairing? I. RNA molecules consist of a single polynucleotide chain, whereas DNA molecules consist of two polynucleotide chains organized into a double helix. One of their nitrogenous bases is different. They contain different sugars. The first and second listed responses are correct differences. The first three listed responses all describe differences. a. Adenine forms hydrogen bonds with thymine Adenine forms hydrogen bonds with uracil. Cytosine forms hydrogen bonds with thymine. Guanine forms hydrogen bonds with adenine. ay b. c. b. c. d. d. e. Which type of macromolecule contains an organism's genetic information? 2. A nucleotide is made of which of the following chemical components? 8. de c. fatty acid a. a nitrogenous base, an amino acid, and a b.) a nitrogenous base, a phosphate group, and c. a series of nitrogenous bases, a nucleic acid d. a nitrogenous base, an amino acid, and a c. anitrogenous base, a fatty acid, and an nucleic acid-DNA phosphate group a pentose sugar backbone, and a hexose sugar pentose sugar amino acid e. phospholipid Which of the following descriptions best fits the class of molecules known as nucleotides? get all three 3. a. a nitrogenous base and a phosphate group b a nitrogenous base and a pentose sugar anitrogenous bag, a phosphate group, and a pentose sugar a phosphate group and an adenine or uracil a pentose sugar and a purine or pyrimidine d. c. Which of the following is true regarding complementary base pairing in DNA and RNA 9. 4. The type of connection between the atoms at the point labeled 1 in the accompanying figure is: a Complementary base pairing within single a. a peptide bond. b. a glycoside linkage. strands of DNA and RNA gives them particular thrce-dimensional structures that are necessary for their function. a disulfide bond a phosphodiester linkage. a hydrogen bond d.) b.) Although a DNA molecule demonstrates complementary base pairing between two DNA polynucleotides to form a double helix, an RNA molecule can only base pair along stretches of nucleotides in the same RNA molecule, such as in transfer RNA molecules. Although the base pairing between two strands of DNA in a DNA molecule can be thousands to millions of base pairs long, base pairing in an RNA molecule is limited to short stretches of nucleotides in the same molecule or between two RNA molecules. A shortage of phosphorus in the soil would make it especially difficult for a plant to manufacture 5. a cellulose b. DNA c. fatty acids c. e. SUcrose 6. On the basis of the principle of complementary base pairing, you would expect the percentage of to equal to the percentage of a. adenine... guanine b. thymine cytosine c. adenine .cytosine d. thymine... guanino adenine thymine d. Complementary base pairing promotes an c. None of the listed responses is correct a. a nucleotide is to a nucleic acid antiparallel orientation in the structure of DNA and RNA molecules. 10. A glucose molecule is to starch as a steroid is to a lipid a nucleic acid is to a polypeptide an amino acid is to a nucleic arid d.

Explanation / Answer

1) a

2) d

3) c

4) d; Bond between sugar and phosphate is called phosphodiester bond.

5) b: As phophorous is a structure element in DNA so the shortage of phosphorous in soil making difficult for making DNA.

6) e

7) e : one nitrogenous base is different is uracil , and contain different sugar as in DNA there is deoxyribose sugar and in RNA there is ribose sugar.

8) b: nucleotides are formed when nucleoside( base + sugar) linked with phospahte So, nucleotides containe three component which is nucleobase+ sugar+ phosphate.

9) c

10) b

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