This kind of bond holds two DNA strands together A) Covalent bonds B) Ionic Bond

Question

This kind of bond holds two DNA strands together A) Covalent bonds B) Ionic Bonds C) Hydrogen Bonds D) Van Der Waals Forces E) Hydrophobic forces Which of the following is NOT a macromolecule? A) Amino Acids B) Starch C) Phospholipids D) DNA E) RNA Match the appropriate amino acid to its functional group or chemical property. A. B. C. D. E. F. None of the above Acidic Hydroxyl Sulfhydral (Thio) Hydrocarbon (not a true functional group) Polar uncharged (2 answers possible) In DNA Thymine base pairs with: A) Adenine B) Cytosine C) Guanine D) Another Thymine E) Uracil

Explanation / Answer

31. Option C is correct. Two strands of DNA holds together by hydrogeb bonds. Hydrogen bonds occur between bases of two strands. Two hydrogen bonds occur between thymine and adeneine base pairing while cytosine and guanine base pairing occurs three hydrogen bonds.

32. Option A is correct. In general macromolecules are large molecules like polymers of of monomers. Micromolecules are small molecules having low molecular weight. For example amino acids are micromolecule and proteins formed by the polymerization of amino acids are macromolecule.

33. Acidic - C (Since it contains side chain with -COOH group which is known as acidic group)

34. Hydroxyl - A (Since it contains side chain with -OH group which is known as hydroxyl group)

35. Sulfhydral - B (Since it contains side chain with -SH group which is known as sulfhydral group)

36. Hydrocarbon - D ( Since it contains side chain with hydrocarbon only which is not a true functional group)

37. Polar uncharged - A and B (Since these contains O and S which forms hydrogen bonds. Although option E also contain N which can form hydrogen bond but this amino acid E is lysine which is charged amino acid)

38. The correct option is A. Thymine base pairs with adenine.

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