Nucleotide Chemistry and Biochemical Functions Quiz
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Questions and Answers

What are the building units of nucleic acids?

  • Nucleosides and nucleotides (correct)
  • Ribose and deoxyribose
  • Nitrogenous bases and phosphate group
  • Pentose sugar and phosphate group

Which nitrogenous base is present in both DNA and RNA?

  • Cytosine
  • Thymine
  • Adenine (correct)
  • Guanine

What is the composition of a nucleotide?

  • Adenine, guanine, cytosine, thymine, and uracil
  • Purine base and pyrimidine base
  • Nitrogenous base, phosphate group, and pentose sugar (correct)
  • Ribose sugar, deoxyribose sugar, and phosphate group

Which type of nucleic acid contains thymine?

<p>Deoxyribonucleic acid (DNA) (D)</p> Signup and view all the answers

What are the two main types of nucleic acids?

<p>DNA and RNA (A)</p> Signup and view all the answers

Which nitrogenous base is present in RNA but not in DNA?

<p>Uracil (B)</p> Signup and view all the answers

Which type of nucleotide contains a base, sugar, and phosphate?

<p>Deoxyguanosine monophosphate (A)</p> Signup and view all the answers

Which nucleotide serves as the active methyl donor?

<p>Adenosine (C)</p> Signup and view all the answers

What is the function of cAMP and cGMP nucleotides?

<p>Serve as 2nd messenger for many hormones (C)</p> Signup and view all the answers

Which base is present in RNA only?

<p>Uracil (A)</p> Signup and view all the answers

What type of bond links the sugar with the base in a nucleoside?

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

Which type of nucleotide enters the structure of many coenzymes such as NAD, NADP, FAD, and FMN?

<p>Purine nucleotides (B)</p> Signup and view all the answers

Which nucleotide serves as the active sulfate donor?

<p>'3'phosphoadenosine-5'-phosphosulfate (D)</p> Signup and view all the answers

Which nucleotide regulates the rate of oxidative phosphorylation in mitochondria?

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

Which nucleotide enters the structure of high energy stores ATP and GTP?

<p>Deoxyguanosine monophosphate (C)</p> Signup and view all the answers

What does SAM stand for and what is its function?

<p>S-adenosyl methionine, serves as an active methyl donor. (C)</p> Signup and view all the answers

What type of nucleic acid structure contains a single chromosome and non-chromosomal DNA called plasmid?

<p>Prokaryotic DNA (A)</p> Signup and view all the answers

What kind of bond links the monomeric nucleotides of DNA together?

<p>Phosphodiester bond (B)</p> Signup and view all the answers

In the structure of DNA, which end possesses a 3hydroxyl and which end possesses a 5-phosphate?

<p>3<code> end possesses 5</code>-phosphate, 5<code> end possesses 3</code>hydroxyl (D)</p> Signup and view all the answers

What is the favored configuration of the double-stranded DNA molecule?

<p>Right handed-helix (B)</p> Signup and view all the answers

What represents the backbone of the axis in the structure of DNA?

<p>Phosphate ribose molecules (B)</p> Signup and view all the answers

Which type of nucleotide in DNA has an anti-parallel configuration?

<p>Thymidylate (A)</p> Signup and view all the answers

What is the diameter of a single turn of β-DNA?

<p>2 nm (C)</p> Signup and view all the answers

How many hydrogen bonds are there between G and C bases in double-stranded DNA?

<p>3 (B)</p> Signup and view all the answers

What is the function of the template strand in DNA?

<p>It is copied during nucleic acid synthesis (C)</p> Signup and view all the answers

What is the source of information for the synthesis of all protein molecules?

<p>DNA (A)</p> Signup and view all the answers

What type of bond links the sugar with the base in a nucleoside?

<p>Covalent bond (B)</p> Signup and view all the answers

Which form of double-stranded DNA is the commonest under physiological conditions?

<p>B-form (D)</p> Signup and view all the answers

How many forms does double-stranded DNA exist in?

<p>6 (A)</p> Signup and view all the answers

What does replication of DNA involve?

<p>Formation of new DNA from parent DNA (B)</p> Signup and view all the answers

What is the width (diameter) of a single turn of β-DNA?

<p>2 nm (D)</p> Signup and view all the answers

What serves as a template in the synthesis of nucleic acids?

<p>DNA (C)</p> Signup and view all the answers

Flashcards

Nucleosides and nucleotides

Building blocks of nucleic acids.

Adenine

A nitrogenous base found in both DNA and RNA.

Nucleotide composition

Nitrogenous base, phosphate group, and pentose sugar.

DNA

Nucleic acid that contains thymine.

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Main types of nucleic acids

Deoxyribonucleic acid (DNA) and Ribonucleic acid (RNA).

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Uracil

Nitrogenous base present in RNA but not in DNA.

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Deoxyguanosine monophosphate

A nucleotide containing a base, sugar, and phosphate.

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Adenosine

Serves as the active methyl donor.

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cAMP and cGMP nucleotides

Serve as 2nd messengers for many hormones.

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Uracil

Nitrogenous base present in RNA only.

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Bond linking sugar to base

Glycosidic bond.

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Nucleotides in coenzymes

Purine nucleotides.

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Active sulfate donor

'3'phosphoadenosine-5'-phosphosulfate

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Nucleotide regulating oxidative phosphorylation

Adenosine

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Nucleotide in ATP and GTP

Deoxyguanosine monophosphate

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SAM (S-adenosyl methionine)

S-adenosyl methionine, serves as an active methyl donor.

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Structure with single chromosome and plasmid

Prokaryotic DNA

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Bond linking nucleotides in DNA

Phosphodiester bond

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DNA ends

3 end possesses 5-phosphate, 5 end possesses 3hydroxyl

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Favored DNA configuration

Right handed-helix

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DNA backbone

Phosphate ribose molecules

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Anti-parallel nucleotide in DNA

Thymidylate

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Diameter of β-DNA turn

2 nm

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Hydrogen bonds between G and C

3

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Template strand function

It is copied during nucleic acid synthesis

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Source of protein synthesis

DNA

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Bond linking sugar to base

Covalent bond

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Common DNA form

B-form

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Forms of double-stranded DNA

6

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DNA Replication Involves

Formation of new DNA from parent DNA

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