Genetics Exam 1

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shutterbug81
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67808
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Genetics Exam 1
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2011-02-21 03:51:47
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Genetics Exam
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Genetics Exam 1
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  1. SSB
    Prevents reannealing of DNA
  2. Primase
    Lays down the RNA primer
  3. DNA Polymerase III
    The major polymerization enzyme
  4. DNA Polymerase I
    Chews our RNA primer
  5. DNA Gyrase
    Relaxes supercoiling
  6. Helicase
    Separates strands in the double helix
  7. Ligase
    Joins Okazaki fragments together
  8. 20 Angstroms
    Diameter of B-DNA double helix
  9. 3.4 Angstroms
    Distance between base pairs
  10. Antiparallel
    Orientation of the two strands in a double helix
  11. The histone core is made up of six different proteins (T/F)
    False
  12. Telomerase carries the telomere repeat's template as a DNA molecule embedded within it (T/F)
    False
  13. Topoisomerase II is one of the components of the protein scaffold that is the next stage in chromosome condensation after the solenoid. (T/F)
    True
  14. Centromeres are highly conserved in DNA sequence when you compare across major taxonomic levels (T/F)
    False
  15. Eukaryotic interphase chromatin is thought to be primarily at the condensation level of B-DNA (T/F)
    False
  16. True breeding lines are heterozygous at the loci of interest (T/F)
    False. homozygous
  17. The kinetochore proteins bind to the centromere DNA (T/F)
    True
  18. A telocentric chromosome has the centromere at the very end of the chromosome, so that no telomere is present at the end (T/F)
    False
  19. Meiosis is a reductional division in terms of chromosome number (T/F)
    True
  20. Genetic recombination in meiosis happens only in prophase I (T/F)
    False
  21. The principle of segregation of alleles is also known as
    Mendel's First Law
  22. The principle of independent assortment is also known as
    Mendel's Second Law
  23. In sex-linked traits, the female donates her X chromosome to...
    both male and female progeny
  24. In sex-linked traits, the male donates his X chromosome to...
    only the female progeny
  25. Which of the following is not a deviation from Mendelian inheritance
    A) Pleitropy
    B) Three alleles per gene
    C) Two-gene interaction
    D) Complete dominance
    E) Incomplete dominance
    D) Complete dominance
    (this multiple choice question has been scrambled)
  26. Leptotene
    Chromosomes start to condense
  27. Zygotene
    Synapsis
  28. Pachytene
    Crossing over
  29. Diplotene
    Chiasmata are first seen
  30. Diakinesis
    End of Prophase I
  31. A sample of double stranded DNA was found to contain 22% G (guanine). What is the expected proportion of T (thymine)?
    28%
  32. The backbone of DNA strand is composed of:
    A) sugars and bases
    B) sugars and phosphates
    C) RNA primers
    D) phosphates and bases
    B) sugars and phosphates
    (this multiple choice question has been scrambled)
  33. Which one of the following forces does NOT hold together the two strands of B-DNA double helix to each other?
    A) Stacking energy
    B) Hydrogen bonds
    C) Van der Waals interaction
    D) Covalent bonds
    D) Covalent bonds
    (this multiple choice question has been scrambled)
  34. In a naked DNA double helix, what is the linear dimension for a segment of DNA encompassing 100 turns?
    0.34 um
  35. In incomplete dominance, the heterozygote is distinguishable from either homozygote (T/F)
    True
  36. The A, B, and O blood group system in humans is an example of codominance (T/F)
    True
  37. The manx cat is an example of multiple alleles (T/F)
    False. An example of lethal allele
  38. The phenotypic ratio of a selfed dihybrid is 9:3:3:1 (T/F)
    True
  39. The genotypic ratio of a selfed monohybrid is 3:1 (T/F)
    False. 1:2:1
  40. The direction a new DNA strand is made is
    5' to 3'
  41. The direction that the template strand is read is
    3' to 5'
  42. The enzyme that breaks the H-bonds in the double helix
    Helicase
  43. The proteins that prevent double helix renaturation
    SSBs
  44. The other name for the 3'-5' exonuclease function is...
    proofreading

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