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DNA REPLICATION

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DNA REPLICATION. Animation gone Crazy. DNA Replicates and Replicates. Enzymes ... In this diagram of the process of DNA replication at a replication fork, the ... – PowerPoint PPT presentation

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Title: DNA REPLICATION


1
DNA REPLICATION
2
Animation gone Crazy
  • DNA Replicates and Replicates

3
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6
Enzymes
  • Lots of enzymes catalyze each step

7
Enzyme Helicase unwinds and separates
(breaking H-Bonds) of the parental double helix.
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What if there is a mistake?
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QUESTION
  • In this diagram of the process of DNA
    replication at a replication fork, the strand
    labeled B is the
  • A template strand
  • B lagging strand
  • C leading strand
  • D Okazaki fragment
  • E RNA primer

31
QUESTION
  • In this diagram of the process of DNA replication
    at a replication fork, the newly synthesized DNA
    strand labeled C is the A coding strand B
    parental DNA
  • C leading strand
  • D lagging strand

32
ANSWER
  • C lagging strand
  • The lagging strand is the newly synthesized DNA
    where addition of nucleotides is on the end
    opposite or away from the replication fork.

33
QUESTION
  • In this diagram of the process of DNA replication
    at a replication fork, the black boxes labeled D
    and E are A RNA primers B DNA template strands
  • C Okazaki fragments
  • D DNA polymerase
  • E Newly synthesized DNA strand

34
ANSWER
  • A. RNA primers
  • The initiation of replication always starts with
    a short RNA piece. The DNA replicating enzymes
    will only add nucleotides to the 3' end of DNA.

35
QUESTION
  • For the DNA strand 5'-TACGATCATAT-3' the correct
    complementary DNA strand is A 3'-TACGATCATAT-5
  • 'B 3'-ATGCTAGTATA-5
  • C 3'-AUGCUAGUAUA-5
  • D 3'-GCATATACGCG-5
  • E 3'-TATACTAGCAT-5'

36
ANSWER
  • B 3'-ATGCTAGTATA-5'

37
Matching RNAs
  • 1.______the structural and functional core for
    protein synthesis
  • 2.______serving as a template for translation
  • 3._____transporting amino acid, respectively
  • A mRNA, tRNA, rRNA
  • B. rRNA, tRNA, mRNA
  • C tRNA, mRNA, rRNA
  • D tRNA, rRNA, mRNA
  • E rRNA, mRNA ,tRNA
  • ANSWER
  • E rRNA, mRNA ,tRNA

38
QUESTION
  • A messenger acid is 336 nucleotides long,
    including the initiator and termination codons.
    The number of amino acids in the protein
    translated from this mRNA is
  • A 999
  • B 630
  • C 330
  • D 111
  • E 110

39
ANSWER
  • D 111
  • A messenger RNA of 336 nucleotides, including
    initiator and termination codons has 333/3 actual
    codons that determine amino acids The initiator
    codon is included since it codes for methionine
    (AUG) but the final three bases or termination
    codon does not specify an amino acid. Thus there
    are 336-3 codons, which would incorporate 111
    amino acids into a protein.

40
QUESTION
  • With what mRNA codon would the tRNA in the
    diagram be able to form a codon-anticodon base
    pairing interaction?
  • A. 3'-AUG-5'
  • B. 3'-GUA-5'
  • C. 3'-CAU-5
  • D. 3'-UAC-5'
  • E. 3'-UAG-5'

41
ANSWER
  • A. 3'-AUG-5'
  • The key is knowing that the sequences must be
    antiparallel. An anticodon of 5'-UAC would have
    to bind a codon of 5'-GUA which is the same as
    AUG-5'.

42
Leading and Lagging Strands
  • Click on animation links on the right
  • Nobelprize.org links
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