Nucleotides in Cell Biology

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Questions and Answers

Which molecules are essential for the production of ribonucleic acid (RNA) and deoxyribonucleic acid (DNA)?

  • Deoxyribonucleotides
  • Ribonucleosides
  • Nucleotides (correct)
  • Proteins

What is the primary role of nucleotides in the synthesis of carbohydrates, lipids, and conjugated proteins?

  • Structural components
  • Signal transduction
  • Second messengers
  • Energy carriers (correct)

Which nucleotides function as second messengers in signal transduction pathways?

  • cAMP and cGMP (correct)
  • NAD[H] and NADP[H]
  • UDP-glucose and CDP-choline
  • Coenzyme A and FAD[H2]

What is the significance of nucleotides in cellular metabolism?

<p>Act as energy currency (D)</p> Signup and view all the answers

How can purine and pyrimidine bases be acquired for nucleotide synthesis?

<p>Both salvage pathways and de novo synthesis (B)</p> Signup and view all the answers

What is the composition of nucleotides?

<p>A nitrogenous base, a pentose monosaccharide, and three phosphate groups (B)</p> Signup and view all the answers

Which nitrogen-containing bases are common to both DNA and RNA?

<p>Guanine (G) and Cytosine (C) (A)</p> Signup and view all the answers

How do DNA and RNA differ in their pyrimidine bases?

<p>DNA contains cytosine (C) while RNA contains uracil (U) (A)</p> Signup and view all the answers

What is the major difference between thymine (T) and uracil (U)?

<p>Thymine has a methyl group while uracil does not (D)</p> Signup and view all the answers

What is formed when a pentose sugar is added to a base through a glycosidic bond?

<p>Nucleoside (D)</p> Signup and view all the answers

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