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GEGE2001 Quiz 4

Michael Jardine 10 Fragen

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  1. 1Individuals heterozygous for a reciprocal translocation often have, at metaphase 1 of meiosis:
    1. ABoth a chromosome bridge and a fragment
    2. BA loop in a bivalent
    3. CLarge number of unpaired chromosomes
    4. DNone of the other answers
    5. EA quadrivalent
  2. 2The maximum value of r, the recombination percentage, is 50% because:
    1. AChromosomes have 2 chromatids
    2. BCrossing over is between 2 of the 4 chromatids present in a bivalent
    3. CIn females, only one of the 4 products of meiosis develops into an egg, but in males all products form sperm
    4. DNone of the other answers
    5. EAt anaphase II, the bivalents split into the 2 chromosomes
  3. 3The coding sequence of a gene is called
    1. AAn exon
    2. BA partitioning sequence
    3. CA promoter
    4. DAn intron
    5. EAn operon
  4. 4Non-coding DNA can best be described as:
    1. ADNA that codes for factors that regulate gene expression
    2. BIncluding stretches of DNA that may have an as yet undefined function for the organism
    3. CDNA that is composed of repetitive sequences of bases
    4. DDNA that is the promoter region for genes
    5. E“junk” DNA that is of little or no value to the organism
  5. 5A “jumping gene” is more often called a:
    1. ANon-coding DNA element
    2. BTranscription sequence
    3. CTransposable element
    4. DPartitioning sequence
    5. ERepetition sequence
  6. 6Given that different organisms can have sections of DNA that are almost identical, which of the following statements is CORRECT?
    1. AThese organisms are always very closely related, as with chimpanzees and humans
    2. BIdentical sections of DNA will always perform the same function, regardless of the organisms in which they are found
    3. CThis DNA is usually non-functional
    4. DThis is only true for repetitive DNA
    5. EThis constitutes evidence of evolution of these organisms from a common ancestor
  7. 7Phenotypic variation between individuals of a species:
    1. AIs the basis upon which natural selection acts
    2. BIs solely a result of genetic differences
    3. CIs greater than variation between members of different species
    4. DHas its primary source in environmental effects
    5. EIs a result of the deletion of specific genes
  8. 8Which of the following statements about DNA is CORRECT?
    1. ATransposable Elements repair DNA damage
    2. BDNA synthesis is self-perpetuating and does not require enzyme mediation
    3. CIntrons are segments of genes that are inserted at replication forks
    4. DMitochondrial DNA is replicated in the nucleus
    5. EOnly 2 per cent of mammalian DNA codes for proteins
  9. 9Genes are being discovered using cDNA. cDNA is:
    1. ACreated from mRNA transcripts, and therefore does not include introns
    2. BNone of the answers are correct
    3. CA direct copy of the DNA at a particular gene locus
    4. DThe complementary double-stranded DNA of a specific gene
    5. EOnly useful if the gene product is an enzyme
  10. 10Genomes are measured as:
    1. AThe number of base pairs of DNA in a somatic cell
    2. BThe total number of base pairs of DNA in a haploid set of different chromosomes of an organism
    3. CNone of the answers are correct
    4. DThe number of chromosomes in a somatic cell of an organism
    5. EThe number of genes found in the nuclear DNA of an organism

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