Which of the following describes a difference between DNA and RNA? A) RNA molecu

Question

Which of the following describes a difference between DNA and RNA? A) RNA molecules generally consist of a single polynucleotide strand, whereas DNA molecules generally consist of two polynucleotide strands organized into a double helix. B) Both molecules contain adenine, guanine and cytosine, but DNA also contains thymine and RNA also contains uracil. C) They contain different sugars. D) Only A and B are correct. E) A, B and C are correct. You have isolated a monomer with the following components: a phosphate group, a sugar, and a nitrogen-containing base. Polymers synthesized from this monomer belong to what class of macromolecule A) Carbohydrate B) Lipid C) Protein D) Nucleic acid E) Phospholipids Thalidomide and L-dopa, shown below, are examples of pharmaceutical drugs that occur as enantiomers, or molecules that A) have identical three-dimensional shapes B) are mirror images of one another and have different biological activity C) are mirror images of one another and have the same biological activity D) are cis-trans isomers E) None of the above If one strand of a DNA molecule has the sequence of bases 5'ATTGCA 3', the other complementary strand would have the sequence A) 5'TAACGT3'. B) 3'TAACGT5'. C) 5'UAACGU3'. D) 3'UAACGU5'. E) 5'UGCAAU3'. What do atoms form when they share electron pairs? A) elements B) ions C) aggregate D) isotopes E) molecules

Explanation / Answer

36.The correct answer is:E) A,B and C are correct.

Reason:RNA is single polynucleotide strand while DNA is double helix,RNA contains uracil istead of thymine present in DNA ,RNA has ribose sugar while DNA has deoxyribose sugar.

37.The correct answer is:D) Nucleic acid.

Reason:Phosphate group,sugar and nitrogen base are part of nucleic acid.

38.The correct answer is:B) are mirror images of one another and have different biological activities.

Reason:Both are just mirror images of one another only.

39.The correct answer is:B) 3'TAACGT5'

Reason:The option mentioned is the correct complementary sequence.

40.The correct answer is: E.molecules

Reason: Atoms form molecules when they share electron pairs.

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