Genetics test 4 real

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kingbken
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Genetics test 4 real
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2011-12-16 03:11:35
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Genetics test 4 real
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  1. When eukaryotic cells are stained with DNA specific dyes and viewed under the light microscrope, DNA molecules are revealed in
    a. the nucleus
    b. the matrix of the mitochondria
    c. the stroma of chloroplasts
    d. All of the above.
    d. All of the above
  2. Charles Yanofsky helped decipher the genetic code working with the ___ biosynthesis genes in ___.
    A. leucine; Salmonella enteritids
    B. tryptophan; Escherichia coli
    C. glycine; Serratia marcescens
    D. phenyyalanine; Klebsiella pneumonia
    B. tryptophan; Escherichia coli
    (this multiple choice question has been scrambled)
  3. A codon is a three base sequence of
    A. DNA that codes for an amino acid
    B. rRNA that codes for an amino acid
    C. rRNA that codes for an amino acid
    D. mRNA that codes for an amino acid
    D. mRNA that codes for an amino acid
    (this multiple choice question has been scrambled)
  4. Researchers purified the lac repressor and showed that it actually has two sites for binding. These two distinct binding sites are
    A. lactose binding, DNA binding
    B. beta-galactosidase binding, RNA binding
    C. beta-galactosidase binding, DNA binding
    D. lactose binding, RNA binding
    A. lactose binding, DNA binding
    (this multiple choice question has been scrambled)
  5. The molecules used in a chloroplast to carry our photosynthesis
    a. are all encoded by chloroplast to carry our photosynthesis
    a. are all encoded by chloroplast DNA
    b. some are encoded by chloroplast DNA
    c. are all encoded by nuclear DNA
    d. some are encoded in nucear DNA and some in mitochondrial DNA
    a. some are encoded by chloroplast DNA
  6. Nonsense codons are
    A. codons that code for multiple amino acids
    B. codons that do not code for an amino acid
    C. codons that can be read forward or backward
    D. start codons
    B. some are encoded by chloropast DNA
    (this multiple choice question has been scrambled)
  7. Which of these is NOT a step in transcription?
    A. elongation
    B. termination
    C. initiation
    D. replication
    D. replication
    (this multiple choice question has been scrambled)
  8. Molecules responsible for stimulating the synthesis of a specific protein are called
    A. repressors
    B. promotors
    C. inducer
    D. enhancer
    C. inducers
    (this multiple choice question has been scrambled)
  9. Which of the following statements is correct with respect to mitochondrial genes?
    A. They are transmitted, largely intact, from parent to offspring.
    B. their inheritance shows Mendel's principle of segregation
    C. Their inheritance shows Mendel's principle of independent assortment.
    d. All of the above
    A. They are transmitted, largely intact, from parent to offspring.
    (this multiple choice question has been scrambled)
  10. The pattern or sequence in which a molecule of mRNA is deciphered by a ribosome is called the
    A. reading frame
    B. code degeneration
    C. synthesis platform
    D. peptide transition
    A. reading frame
    (this multiple choice question has been scrambled)
  11. Splicing of transcripts normally occurs only in
    A. prokaryotes
    B. prokaryotes and eukaryotes
    C. eukaryotes
    D. mitochondria, as they have their own DNA
    C. eukaryotes
    (this multiple choice question has been scrambled)
  12. In the operon model of gene regulation, transcription is shut off by the binding of repressor to the promoter.
    a. True
    b. False
    b. False
  13. Which of the following has been associated with Alzheimer's Disease?
    A. loss of mitochondria
    B. mutations in cytocrome oxidase c genes in brain cells
    C. 5kb and 7.4kb deletions in mtDNA of heart cells
    d. All of the above.
    B. mutations in cytochrome oxidase c genes in brain cells
    (this multiple choice question has been scrambled)
  14. There are ______ usually found in the genetic code.
    A. 0 start codons and 4 stop codons
    B. 2 start codons and 2 stop codons
    C. 3 start codons and 1 stop codon
    D. 1 start codon and 3 stop codons
    D. 1 start codon and 3 stop codons
    (this multiple choice question has been scrambled)
  15. The sequences within mRNA that are spliced out are called
    A. exons
    B. extremes
    C. includions
    D. introns
    D. introns
    (this multiple choice question has been scrambled)
  16. The occurence of constitutive mutations of all three of the lactose utilizing enzymes indicates that their synthesis is regulated together, probably by another gene.
    a. True
    b. False
    a. True
  17. Inhibitors of bacterial translation, such as chloramphenicol and erythromycin, generally
    A. are inhibitors of eukaryotic cytoplasmic protein synthesis
    B. have no effect on mitochondrial protein synthesis
    C. are inhibitors of mitochondrial protein synthesis
    D. are inhibitors of eukaryotic cytoplasmic protein synthesis and have noeffect on mitochondrial protein synthesis
    C. are inhibitors of mitochondrial protein synthesis
    (this multiple choice question has been scrambled)
  18. The expressed sequences within mRNA that code for gene products are called
    A. introns
    B. inclusions
    C. extremes
    D. exons
    D. exons
    (this multiple choice question has been scrambled)
  19. A(n) _______ consists of proteins and small nuclear RNAs forming discrete particles that mediate splicing.
    A. ribosome
    B. splicesome
    C. chromosome
    D. holoenzyme
    E. nucleosome
    B. splicesome
    (this multiple choice question has been scrambled)
  20. The transition from transcriptional initiation to elongation involves
    A. release of sigma factor
    B. binding of rho factor
    C. release of RNA polymerase from DNA
    D. binding of RNA polymerae to DNA
    E. binding of sigma factor
    A. release of sigma factor
    (this multiple choice question has been scrambled)
  21. Molecular evidence suggests that DNA sequences may have been transferred between
    a. mtDNA and nucler DNA
    b. cpDNA and mtDNA
    c. different cpDNA molecules
    d. All of the above
    d. All of the above
  22. Which of these is NOT a character of the genetic code?
    A. The code is degenerate
    B. The code is used by nearly every living organism.
    C. Some amino acids have multiple codons
    D. There are the same number of codons as there are amino acids
    D. There are the same number of codons as there are amino acids
    (this multiple choice question has been scrambled)
  23. RNA molecules that can act as enzymes and catalyze specific biochemical reactions are known as ______
    A. donors
    B. restriction enzymes
    C. tRNA
    D. ribozymes
    E. splice acceptors
    D. ribozymes
    (this multiple choice question has been scrambled)
  24. The actual site of binding RNA polymerase in order to initiate transcription is
    A. repressor
    B. promoter
    C. enhancer
    D. inducer
    B. promoter
    (this multiple choice question has been scrambled)
  25. Mitochondria and chloroplasts are considered to be semiautonomous.
    a. True
    b. False
    a. True
  26. Aminoacyl-tRNA synthetase is the enzyme that
    A. causes tRNA molecules into their proper configuration
    B. produces tRNA by "reading" DNA molecules
    C. adds the appropriate amino acid to an uncharged tRNA
    D. fold tRNA molecules into their proper configuration
    C. adds the appropriate amino acid to an uncharged tRNA
    (this multiple choice question has been scrambled)
  27. rRNA carried an anticodon, which is the complmentary sequence to the mRNA codon that specifies a particular amino acid
    a. True
    b. False
    b. False
  28. What would be the phenotype of a mutation that altered lac repressor function?
    A. constitutive
    B. permanently repressed
    C. inducible
    d. none of the above
    A. constitutive
    (this multiple choice question has been scrambled)
  29. What type of DNA sequences might be studied to help reunite displace children with their families?
    A. mtDNA
    B. Y chromosome sequences
    C. highly conserved nuclear sequences
    D. cpDNA
    A. mtDNA
    (this multiple choice question has been scrambled)
  30. Transcription occurs in the ____ and translation occurs in the ____ of prokaryotic cells.
    A. cytoplasm, nucleus
    B. cytoplasm, cytoplasm
    C. nucleus, cytoplasm
    D. nucleus, nucleus
    B. cytoplasm. cytoplasm
    (this multiple choice question has been scrambled)
  31. which of the following statements is true under ordinary conditions?
    A. DNA and RNA last only for a short time within a cell.
    B. DNA lasts forever within a cell while RNA lasts only for a short time
    C. RNA lasts forevery within a cell while DNA lasts only for a short time.
    D. RNA and DNA both last forever within a cell.
    B. DNA lasts forever within a cell while RNA lasts only for a short time.
    (this multiple choice question has been scrambled)
  32. RNA polymerase binds to a sequence called a/an _____ before beginning transcription
    A. operator
    B. promoter
    C. structural gene
    D. replication origin
    B. promoter
    (this multiple choice question has been scrambled)
  33. The scientists who proposed the operon theory are
    A. Hary and Weinberg
    B. Hersey and Chase
    C. Watson and Crick
    D. Monod and Jacob
    D. Monod and Jacob
    (this multiple choice question has been scrambled)
  34. Ribosomes are composed of
    A. mRNA and protein
    B. only proteins folded together
    C. rRNA and protein
    D. tRNA and protein
    C. rRNA and protein
    (this multiple choice question has been scrambled)
  35. In the modification of eukaryotic mRNA, a "cap" consisting of a/an ___ and a tail consisting of ___ are usually added to the transcript.
    A. multiple guanines; methyl groups
    B. multiple thymines; acetyl groups
    C. acetyl group; multiple cytosines
    D. methyl group: multiple adenines
    D. methyl group; multiple adenines
    (this multiple choice question has been scrambled)
  36. A single DNA unit that enables the simultaneous regulation of more than one gene in response to environmental changes is called
    A. regulator
    B. inducer
    C. operator
    D. operon
    E. promoter
    D. operon
    (this multiple choice question has been scrambled)
  37. Mitocondrial DNA has an approximately 10-fold higher rate of mutation compared to nuclear DNA.
    a. True
    b. False
    a. True
  38. A single DNA unit that enables the simultaneous regulation of more than one gene in response to environmental changes is called
    A. operator
    B. operon
    C. promoter
    D. inducer
    E. regulator
    B. operon
    (this multiple choice question has been scrambled)
  39. Mitochondrial DNA has an approximately 10-fold higher rate of mutation compared to nuclear DNA
    a. True
    b. False
    a. True
  40. A tRNA that recognizes a nonsense codon and inserts an amino acid where protein synthesis should have stopped is called a
    A. suppressor tRNA
    B. excision tRNA
    C. nonsense tRNA
    D. revertant tRNA
    A. suppressor tRNA
    (this multiple choice question has been scrambled)
  41. A mutation that occurs when a base is inserted into or deleted from a DNA sequence, completely altering the subsequent amino acid sequence, is called a
    A. nonsense mutation
    B. missense mutation
    C. frameshift mutation
    D. silent mutation
    C. frameshift mutation
    (this multiple choice question has been scrambled)
  42. The universal code of DNA is the same for mtDNA as for chromosomal DNA.
    a. True
    b. False
    b. False
  43. An 60S eukaryotic ribosomal subunit does NOT consist of which of the following rRNAs?
    A. 5.8S
    B. 28s
    C. 18s
    D. 5S
    C. 18S
    (this multiple choice question has been scrambled)
  44. Except in reverse transcription, RNA is synthesized in a 3' to 5' fashion.
    a. True
    b. False
    b. False
  45. The template and RNA-like DNA strand are equivalent.
    a. True
    b. False
    b. False

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