Please answer ASAP. In living cells, nucleotides and their can serve as: A) carr

Question

Please answer ASAP.
In living cells, nucleotides and their can serve as: A) carriers of metabolic energy. B) enzyme cofactors C) intracellular signaling molecules D) precursors for nucleic acid synthesis. E) all of the above. Adenine have ring(s), (each) containing nitrogen(s), where as cytosine have ring(s) (each) containing nitrogen(s). A) 1; 1; 1; 1 B) 1; 2; 1; 2 C) 2; 1; 1; 2 D) 2; 2; 1; 1 E) 2; 2; 1; 2 A component of RNA but not of DNA is: A) adenine B) cytosine. C) guanine. D) thynaine. E) uracil. The difference between thymine and uracil is: A) one methylene group on the pyimidine ring. B) one methyl group on the pyrimidine ring. C) one hydroxyl group on the ribose ring. D) one amine group on the pyrimidine ring. E) one methyl group on the purine ring. The DNA "backbone" is composed of A) An amide bond between deoxyribose and a nitrogenous base B) A glycosidic bond between deoxyribose and a nitrogenous base C) A phosphodiester bond between 3 and 5 hydroxyl groups of adjacent deoxyribose residues D) A phosphodiester bond between 2' 5' hydroxyl groups of adjacent E) None of the above are correct The difference between a ribonuclcotide and a deoxyribouclotide is; A) A deoxyribonucleotide has an H instead of an OH at 2' carbon. B) a deoxyribonucleotide has an H instead of an OH at 3' carbon. C) a ribonulceotide has an extra OH at 4' carbon. D) a ribonucleotide has more structural flexibility than deoxyribonucleotide. E) a ribonucleotide is a pyranose, deoxyribonucleotide is a furanose.

Explanation / Answer

Q15

all of above is the best answer, since they are used in all the previos

Q16.

2 rings (5 carbon + 6 carbon rings)

each ring contains --> 2 nitrognes

cytosine has --> 1 ring

only 2 carbons

so choose 2,2,1,2 which is E

Q17

RNA includes the URACIL

Q18

thymine and uracil

thymine has a methyl extra than the uracil

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