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5 Written questions

5 Matching questions

  1. polyribosomes/polysomes
  2. bidirectional replication
  3. histone octamer (4)
  4. DNA Ligases
  5. structure of tRNA
  1. a seals okazaki fragments on lagging strand.
  2. b -several attached ribosomes associated to one mRNA
    -contain functional components of mRNA, tRNA and ribosomes
  3. c -has a primary, secondary (cloverleaf) and tertiary(L-shaped) structyre
    -bulk of it is double stranded bc of distal complementary base(nucleotide) pairs
    -unique anticodons to complement mRNA(5' end of each) and amino acid(3'-adenine by aaRS)
  4. d -2 copies each of core histones H2A, H2B, H3, H4
    "the core particle" (doesn't include H1)
  5. e -initiates at original sequences and proceeds in both directions along DNA
    -leading goes bonds toward parent DNA, lagging bonds in opposite direction

5 Multiple choice questions

  1. composed of many splicing factors
    -mediate splicing process
  2. rRNA transcribed at border of fc and here
    -ribosomal proteins associate here to form pre-rRNP particles
  3. region of chromosomes where rRNA genes are amplified (>100 copies)
  4. -processing of pre-rRNP particles occurs here
    -mature ribosomal subunits released for transport to cytoplasm
  5. tested the three models of DNA replication by this: bacteria grown in N15; transferred to medium containing 14N. different N-isotope distinguishable
    -prove semi-conservative replication

5 True/False questions

  1. polyribosome-composed of 60S(large) and 40S (small) subunit
    -a ribonucleopritein composed of rRNA (ribosomal) and proteins

          

  2. untranslated regions (UTRs)- carries amino acids to the ribosome during translation
    - mediates recognition of codon
    -small RNA (74-95 nucleotides)
    -each type of tRNA can attach to only 1 type of amino acid

          

  3. elongation phase of protein synthesis1: aminoacyl-tRNA selection
    -2nd aminoacyl-tRNA enters A site
    -1st combining with protein elongation factor bound to GTP (EF-Tu-GTP)
    -GTP hydrolyzed and Tu-GDP complex released, leaving aa-tRNA bound in A site
    2: peptide bond formation between the 2 tRNAs (enzyme peptidyl transferase catalyst)
    -forms dipeptidym-tRNA
    3: translocation: ribosome moves 1 codon along mRNA (in 5'-3' direction)
    -deacylated tRNA moves from P site to E site
    -GTP hydrolyzed and EF-G-GDP leaves ribosome
    4:release deacylated tRNA: new aminoacyl-tRNA enters A site

          

  4. tRNA (transfer)- carries amino acids to the ribosome during translation
    - mediates recognition of codon
    -small RNA (74-95 nucleotides)
    -each type of tRNA can attach to only 1 type of amino acid

          

  5. RNA primaseunwinds DNA at replication fork with energy from ATP hydrolysis.