Molecular Genetics: DNA Structure and Chargaff's Rule

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Questions and Answers

What is the characteristic of B DNA?

  • Left-handed helix with 10 residues per turn
  • Right-handed helix with 10 residues per turn (correct)
  • Right-handed helix with 11 base pairs per turn
  • Left-handed helix with 12 base pairs per turn

What is the number of hydrogen bonds between Adenine and Thymine?

  • 4
  • 1
  • 3
  • 2 (correct)

What is the shape of Z DNA?

  • Linear structure
  • Left-handed helix (correct)
  • Circular structure
  • Right-handed helix

What is the genetic code responsible for?

<p>Specifying the sequence of amino acids in proteins (A)</p> Signup and view all the answers

What is the purpose of the codons in the genetic code?

<p>To specify the sequence of amino acids (B)</p> Signup and view all the answers

What is the function of a typical protein?

<p>Participating in metabolic processes (C)</p> Signup and view all the answers

What is the total number of codons in the genetic code?

<p>64 (D)</p> Signup and view all the answers

What is the function of the enzyme primase in DNA replication?

<p>To start DNA replication by synthesizing RNA primers (D)</p> Signup and view all the answers

What is the characteristic of the genetic code that ensures that a specific codon always codes for the same amino acid?

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

During DNA replication, what is the direction of synthesis of new DNA strands?

<p>5' to 3' (C)</p> Signup and view all the answers

What is the result of DNA replication?

<p>Two identical double-stranded DNA (B)</p> Signup and view all the answers

What is the function of the origin recognition complex (ORC) in DNA replication?

<p>To recognize the origin of replication (D)</p> Signup and view all the answers

What is the primary function of topoisomerases during DNA replication?

<p>To relieve torsional strain that results from helicase-induced unwinding (A)</p> Signup and view all the answers

Which enzyme is responsible for removing mismatched nucleotides during DNA replication?

<p>DNA polymerase III (B)</p> Signup and view all the answers

What is the direction of synthesis of the leading strand in DNA replication?

<p>5' to 3' (B)</p> Signup and view all the answers

Which enzyme is responsible for synthesizing short segments of complementary RNA primers during DNA replication?

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

What is the characteristic of the lagging strand in DNA replication?

<p>It is synthesized in short, discontinuous segments (D)</p> Signup and view all the answers

What is the function of DNA ligase in the replication process?

<p>To seal the nick by catalyzing the formation of a phosphodiester bond (B)</p> Signup and view all the answers

Which of the following RNA polymerases is responsible for synthesizing tRNA?

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

What is the function of enhancers in the transcription process?

<p>To stimulate transcription rate (C)</p> Signup and view all the answers

What is the function of introns in the post-transcriptional modification process?

<p>To be removed and spliced out of the RNA transcript (C)</p> Signup and view all the answers

What is the function of tRNA in the translation process?

<p>To carry amino acids to the growing polypeptide chain (A)</p> Signup and view all the answers

What is the sequence of the translated protein in the given example?

<p>NH2 - Met - Tyr - Stop - His - COOH (D)</p> Signup and view all the answers

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