35. The building blocks of DNA are a. adenine, guanine, cytosine, thymine b. ade
ID: 135295 • Letter: 3
Question
35. The building blocks of DNA are a. adenine, guanine, cytosine, thymine b. adenine, uracil, guanine, thymine c. uracil, cytosine, adenine, thymine d. guanine, cytosine, uracil, thymine e. none of the above is correct 36. Which of the following is likely to be hydrophobic? a. water b. NaCI c. sugar d. glucose e. lipid 37. Glucose is a member of the class of organic molecules a. carbohydrate b. protein c. lipid d. nucleic acid e. hydrocarbon 38. Glucose is a polymer formed by the combination of monomers. a. True b. False 39. Steroids belong to the class of organic molecules. a. carbohydrate b. protein c. lipid d. nucleic acid e. hydrocarbonExplanation / Answer
35) Building blocks of DNA are adenine, guanine,cytosine, thymine which are nitrogenous bases.
DNA is polymer of nucleotides and each nucleotide consists of nitrogenous base attach to 5 carbon sugar(deoxyribose) and phosphate group.Uracil is not found in DNA but modified uracil (methylated uracil i.e thymine )is found.
36)Lipid is likely to be hydrophobic, it repel water molecule.
Glucose is polar molecule with hydroxyl group and readily disolves in water.
NaCl and sugar is also hydrophilic because they readily dessolve in water.
37) Glucose is member of the carbohydrate class of organic molecule. It is monosaccharide with formula C6H12O6.
Carbohydrates are hydrates of carbon,they are polyhydroxy aldehyde or ketone.
Hydrocarbon are simple organic molecule consists of hydrogen and carbon.
Protein is polymer of amino acids. Lipid is macromolecule not a polymer composed of two things i.e polyhydroxy alcohol and fatty acid. Nucleic acids are polymer of nucleotides.
38) False, because glucose is monomer, monosaccharide with formula C6H12O6.It form polymer i.e starch and glycogen when large number of glucose unit joined by glycosidic bond.
39) Lipid
Steroides are hydrophobic and insoluble in water. It has hydrophobic tail and hydrophilic head.
Examples of steroides are cholesterol,cortisol etc.
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