Genetics test 3 real

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kingbken
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Genetics test 3 real
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2011-12-16 12:18:50
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Genetics test 3 real
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  1. Intercalating agents such as ethidium bromide function as mutagens to
    A. fit between stacked bases and disrupt replication
    B. attach to purines, causing distorion
    C. add ehyl or methyl groups
    D. remove amine groups
    E. promote transitions
    A. fit between stacked bases and disrupt replication
    (this multiple choice question has been scrambled)
  2. The components of a chromosome include one long DNA molecule and
    A. phospholipids
    B. steroids
    C. proteins
    D. RNA
    E. carbohydrates
    C. proteins
    (this multiple choice question has been scrambled)
  3. Sometimes a part of the genome moves from chromosome to chromosome. This is known generally as a
    A. inversion
    B. translocation
    C. duplication
    D. transposable element
    E. deletion
    D. transposable element
    (this multiple choice question has been scrambled)
  4. Which of the following is not true about DNA polymerase?
    A. it can reconstruct the 3 end of each newly made DNA strand.
    B. It cannot begin 5 end of a new strand without a primer
    C. it can only travel in the 5 to 3 direction
    D. It can replace RNA primer with DNA at the 5 end.
    D. it can replace RNA primer with DNA at the 5 end
    (this multiple choice question has been scrambled)
  5. An integrated copy of a termperate bacteriophage is called a prophage.
    a. True
    b. False
    a. True
  6. The duplication of the triplet sequence CGG resultin in elongation or breakage of the X-chromosome is termed
    A. Huntington's disease
    B. Fragile X syndrome
    C. Barr-eyed
    D. rhys syndrome
    E. unequal crossing over
    B. Fragile X syndrome
    (this multiple choice question has been scrambled)
  7. Which of the following are properties of telomeres?
    A. prevent the loss of DNA throught incomplete replication
    B. number of repeats varies with cell type
    C. All of the choices are correct
    D. consist of special repetitive DNA sequence
    E. cap the ends of each chromosome
    E. All of the choices are correct
    (this multiple choice question has been scrambled)
  8. Robertsonian translocations result from which of the following?
    A. breaks occur at or near the centromeres of two acrocentric chromosomes, followed by the reciprocal exchange of broken parts
    B. a part of one chromosome becomes attached to a non-homologous chromosome
    C. fusion of two small chromosomes end-to-end such that a double centromere occurs
    D. unequal crossing over occurs during meiosis
    A. breaks occur at or near the centromeres of two acrocentric chromosomes, followed by the reciprocal exchange of broken parts
    (this multiple choice question has been scrambled)
  9. Individuals who are deletion heterozygotes have a greatly increased risk of losing both copies of certain genes and developing cancer. One such disease in humans is
    A. retinoblastoma
    B. triplolethal
    C. scarlet eyes
    D. cataracts
    A. retinoblastoma
    (this multiple choice question has been scrambled)
  10. Chromosome banding patterns can be used for which of the following?
    A. to analyze chromosomal differences between species
    B. to locate genes
    C. All of the choices are correct
    D. to reveal the cause of certain genetic diseases
    C. All of the choices are correct
    (this multiple choice question has been scrambled)
  11. The enzyme that some organisms use to replicare DNA at the 5' ends of chromosomes is called
    A. replicase
    B. DNA ligase
    C. DNA polymerase
    D. telomerase
    D. telomerase
    (this multiple choice question has been scrambled)
  12. A mutation in which parts of two nonhomologous chromosomes change places is called a
    A. insertion
    B. transversion
    C. deletion
    D. translocation
    E. transition
    D. translocation
    (this multiple choice question has been scrambled)
  13. Which of the following is not usually seen when a cell loses telomerase activity?
    A. Many normal somatic cells gain the ability to divide indefinitely.
    B. In the immune system, certain capacity for protection is gradually lost.
    C. Telomeres shorten slightly with each cell division
    D. After 30-50 divisions, cells show signs of senescence and then die.
    A. Many normal somatic cells gain the ability to divide indefinitely.
    (this multiple choice question has been scrambled)
  14. By weight, chromatin consists roughly of
    A. 1/4 dna, 1/4rna, 1/4 histones, 1/4 nonhistones
    B. 1/3 dna and 2/3 acidic proteins
    C. 1/3 dna, 1/3 histones, and 1/3 basic proteins
    D. 1/3 dna, 1/3 histones, and 1/3 nonhistones
    D. 1/3 dna, 1/3 histones, 1/3 nonhistones
    (this multiple choice question has been scrambled)
  15. We spread 109 bacteria on a plate with 25ug streptomycin/ml. four colonies grew. These colonies contain bacteria that are
    A. able to grow in unusual circumstances
    B. resistant to streptomycin
    C. resistant to all antibiotics
    D. wild type
    e. None of the above
    B. resistant to streptomycin
    (this multiple choice question has been scrambled)
  16. The hydrolysis of a purine base from the deoxyribose-phosphate backbone is called
    A. replica plating
    B. excision repair
    C. depurination
    D. deletion
    E. deamination
    C. depurination
    (this multiple choice question has been scrambled)
  17. Histones and DNA have a strong attraction for each other because
    A. like substances share common charges
    B. both DNA and proteins are hydrophobic
    C. DNA is negatively charges and histones are positively charges
    D. DNA is positively charges and histones are negatively charges
    e. None of the above
    C. DNA is negatively charges and histones are positively charges
    (this multiple choice question has been scrambled)
  18. Down syndrome can result from
    A. three copies of chromosome 21
    B. A,B, and C are all correct
    C. both A and B
    D. a reciprocal translocation between any two autosomes
    E. a translocation of a part of chromosome 21
    C. both A and B
    (this multiple choice question has been scrambled)
  19. From DNA research, sites of transcription and therefore most of the genes along the length of the chromosome appear to be found in
    A. constitutive heterochromatin
    B. centromeric regions
    C. heterochromatin
    D. euchromatin
    D. euchromatin
    (this multiple choice question has been scrambled)
  20. Which of the following is not an aneuploidy?
    A. tetraploid
    B. trisomy
    C. tetrasomy
    D. monosomy
    A. tetraploid
    (this multiple choice question has been scrambled)
  21. Electroporation is the use of high-voltage and high calcium salt to force foreign DNA into bacteria.
    a. True
    b. False
    b. False
  22. Choose the statement that is most correct regarding the rII- strain of T4 that Benzer studied.
    A. produces smaller plaques than wild type
    B. produces larger plaques; grows in E. coli K, not in E. coli B
    C. produces larger plaques, grows in both E. coli K and E. coli B
    D. produces smaller plaques; grows in E. coli K, not in E. coli B
    E. produces larger plaques, grows in E. coli B, not in E. coli K
    E. produces larger plaques, grows in E. coli B, not in E. coli K
    (this multiple choice question has been scrambled)
  23. What would happen if a transposon were to "jump" into the origin of replication of the bacteria genome?
    A. None of the choices would occur.
    B. Transposon would "jump" to another location
    C. Transposon would be replicated like the genome.
    D. Transposon would express its gene constituitively.
    E. Transposon would inactivate the origin and no DNA replication would be possible
    E. Transposon would inactivate the origin and no DNA replication would be possible
    (this multiple choice question has been scrambled)
  24. Indicate the correct order for one round of infection by bacteriophase T4.
    1. Lysis of host cell.
    2. Phage proteins and DNA synthesized, host DNA degraded.
    3. Assembly of phage within host cell.
    4. Phage body enters host cell.
    5. Phage injects DNA into host cell.
    A. 4,2,3,1
    B. 1,2,3,4,5
    C. 5,1,2,3
    D. 5,2,3,1
    E. 4,5,3,1
    D. 5,2,3,1
    (this multiple choice question has been scrambled)
  25. Which of the following is not a role ascribed to nonhistone proteins found in chromatin?
    A. replication
    B. nucleosome packers
    C. structural
    D. chromosome segregation
    B. nucleosome packers
    (this multiple choice question has been scrambled)
  26. Sometimes a piece of one chromosome attaches to another chromosome. This is known as
    A. deletion
    B. duplication
    C. translocation
    D. inversion
    e. None of the above
    C. translocation
    (this multiple choice question has been scrambled)
  27. Specialized transduction allows phages to pick up only adjacent DNA from the host chromosome during the transition from the lysogenic to the lytic cycle.
    a. True
    b. False
    a. True
  28. Down syndrome is an example of triplody
    a. True
    b. False
    b. False
  29. The results of the Luria Delbruck experiment indicated that
    A. a low level of any bacterial population is naturally resistant to phage
    B. phage mutate to produce large plaques with sharp edges
    C. bacteria become resistant to phage by mutation when exposed to phage
    D. bacteria are naturally resistant to phage
    E. bacteria become resistant to phage by random spontaneous mutation prior to exposure
    A. a low level of any bacterial population is naturally resistant to phage
    (this multiple choice question has been scrambled)
  30. In mammalian cells, replication proceeds
    A. unidirectionally
    B. bidirectionally
    C. unidirectionally from many origins
    D. bidirectionally from only one origin
    D. bidirctionally from only one origin
    (this multiple choice question has been scrambled)
  31. ____ are small circular pieces of DNA frequently found in bacteria.
    A. insertion sequences
    B. plasmids
    C. centromeres
    D. transposons
    E. baceriophage
    B. plasmids
    (this multiple choice question has been scrambled)
  32. Red-green-color-blindness is more common in males than females because
    A. the red pigment gene is on the X chromosome; the green is on an autosome
    B. both the red and the green pigment genes are on the X chromosome
    C. both the red and the green pigment genes are on the autosome
    D. the rhodopsin gene is on the X chromosome
    E. the green pigment gene is on the X chromosome; the red is on an autosome
    B. both the red and the green pigment genes are on the X chromosome
    (this multiple choice question has been scrambled)
  33. Which of the following grows on minimal media only if supplemented?
    A. prototrophic
    B. auxotrophic
    C. transposable element
    D. cistron
    B. auxotrophic
    (this multiple choice question has been scrambled)
  34. In the Luria Delbruck experiment, the bacteria +phage plates showed
    A. some plates had no resistant colonies; a few plates had very many resistant colonies
    B. all plates had some resistant colonies; some had very many
    C. some plates had no resistant colonies; the plates that had resistant colonies all had the same number of resistant colonies
    D. phage cause mutation to occur in some of the plates but not in others
    E. all plates had the same number of resistant colonies
    A. some plates had no resistant colonies; a few plates had very many resistant colonies
    (this multiple choice question has been scrambled)
  35. The first level of compaction of DNA consists of
    A. DNA winding around histones to form small nucleosomes
    B. tight coiling of DNA with nucleosomes into higher order structure
    C. histones, DNA, and nonhistones covalent bonding
    D. high level compaction into metaphase-type chromosomes
    A. DNA winding around histones to form small nucleosomes
    (this multiple choice question has been scrambled)
  36. rhizobia are bacteria that live symbiotically in the roots of leguminous plants. It has been proposed that some enzymes in the bacteria were derived from the plant. What mechanism would most likely have been involved in this?
    A. transformation
    B. specialized transduction
    C. conjugation
    D. generalized transduction
    A. transformation
    (this multiple choice question has been scrambled)
  37. The conseqeuence to a bacterial cell of a mutation that inactivated the enzyme that methylates the A of the sequence GATC in newly made DNA would be
    A. failure to distinguish old and new DNA during mismatch repair
    B. inactivation of certain metabolic genes
    C. decrease in the mutation rate
    D. failure to carry out replication
    E. failure to correct thymine dimmers
    A. failure to distinguish old and new DNA during mismatch repair
    (this multiple choice question has been scrambled)
  38. Cohesins are a multisubunit protein complex that functions to
    A. allow easy karyotyping
    B. develop meiotic chromosome replication
    C. hold sister chromatids together
    D. ensure that proper chromosome arm length is maintained
    e. all of the above
    C. hold sister chromatids together
    (this multiple choice question has been scrambled)
  39. Which of the following adds material to the genome?
    A. duplications
    B. translocations
    C. deletions
    D. inversions
    e. None of the above
    A. duplications
    (this multiple choice question has been scrambled)
  40. Two bacteria grow together. One appears to donate DNA to the other. One of the bacteria contains a bacteriphage that is normally quiescent but occasionally forms a plaque. What sort of genetic exchange is more likely to be occuring?
    A. transduction
    B. electroporation
    C. transformation
    D. conjugation
    A. transduction
    (this multiple choice question has been scrambled)
  41. The lysogenic cycle of phage production results in bacterial cell lysis.
    a. True
    b. False
    b. False
  42. The structure of a protein that involves the interaction between two distinct polypeptide chains is
    A. primary structure
    B. quaternary structure
    C. tertiary structure
    D. secondary structure
    B. quarternary structure
    (this multiple choice question has been scrambled)
  43. Which of the following removes materials from the genome?
    A. deletions
    B. duplications
    C. inversions
    D. translocations
    e. None of the above
    A. deletions
    (this multiple choice question has been scrambled)
  44. Unequal crossing over results in
    A. an exchange between nonhomologous chromosomes
    B. a production of eggs containing Y chromosomes
    C. a creation of deletions and duplications
    D. a repair of UV-induced damage
    C. a creation of deletions and duplications
    (this multiple choice question has been scrambled)

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