Biol 160 Exam 2 (T/F)

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Author:
Derek.Vargas1
ID:
243781
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Biol 160 Exam 2 (T/F)
Updated:
2013-10-29 20:37:15
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Microbial Physiology
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Microbial Physiology
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  1. CO2 can be used for energy generation by acting as an electron acceptor, but not electron donor.
    TRUE
  2. Among all   lives on earth, only archaea can produce methane.
    TRUE
  3. Only bacteria can do CO2 fixation.
    FALSE
  4. Only archaea can grow on C1 compounds such as methane, methanol, formaldehyde,   formate, methylamine.
    FALSE
  5. Bacteria do CO2 assimilation for energy generation.
    FALSE
  6. Bacteria do fermentation in order to grow on methane.
    FALSE
  7. Bacterial flagella use proton potential for its energy source.
    TRUE
  8. Bacterial flagella are anchored at outer membrane.
    FALSE
  9. Bacterial pili are anchored at cell membrane.
    FALSE
  10. Bacterial swimming and swarming involve movement. However, swimming is for individual one and swarming is for the movement of a population.
    TRUE
  11. Gram-positive  cell wall is thicker than Gram-negative counterpart and this is the basis for   Gram staining.
    TRUE
  12. In many cases, LPS has important role in pathogens’ virulence, so one of its   components is often called O antigen(s).
    TRUE
  13. LPS is anchored at cell membrane.
    FALSE
  14. 16s rRNA which has been used for phylogeny is one component of ribosome.
    TRUE
  15. Bacteria have nuclei.
    FALSE
  16. Bacteria   excrete enzymes outside of their cells to build either cell wall structure or   outer membrane structure.
    FALSE
  17. Most bacteria divide by fission.
    TRUE
  18. Most bacteria can be cultured in the laboratory.
    FALSE
  19. Under overwhelming environmental stresses (such as heat, osmotic stress), bacterial   cells usually become less active.
    TRUE
  20. Cells   entering stationary phase become more resistance to environmental stresses   such as high temperature, osmotic stress, and certain chemicals.
    TRUE
  21. Bacterial   ribosomes can change the rate of protein synthesis in response to growth   situation.
    FALSE
  22. Faster   growing bacterial cells are bigger compared to slower growing counterparts.
    TRUE
  23. When   bacterial cells sense amino acid starvation inside the cell (of course   because of lack of food outside), the cells should not make ribosomes at the   expense of energy. So, there must be a ribosome regulation mechanism in the   bacterial cells.
    TRUE
  24. Mutations in DNA always lead to a change in phenotype.
    FALSE
  25. The chromosomes of most bacteria are circular.
    TRUE
  26. DNA  polymerase always requires a small RNA or DNA (termed primer) to initiate   chain elongation.
    TRUE
  27. DNA  polymerase always elongates DNA in 5’ à 3’ direction.
    TRUE
  28. Our best   friend E. coli is so smart   that during DNA replication it can distinguish between original old strand   and newly-made copy strand.
    TRUE
  29. In   bacteria, every DNA base in the chromosome is transcribed into RNA.
    FALSE
  30. RNA   polymerase prefers some DNA sites for it to bind.
    TRUE
  31. If you are   able to see the sequences of all the proteins inside a bacterium, you will   find always methionine at the N-termini of all those proteins.
    FALSE
  32. If you have an mRNA the size of which is 300 bp, then you will have a protein the   size of which is 100 amino acids.
    FALSE
  33. In the   mRNA sequence, there is a site that ribosome preferentially binds.
    TRUE
  34. Peptide   bond formation is catalyzed by a peptidyltransferase in the ribosome. Such   activity is in RNAs, not in proteins.
    TRUE
  35. Since there are 20 different amino acids, the total number for the type of tRNAs is 20.
    FALSE
  36. A tRNA   should be able to recognize both amino acid and a codon present in mRNA.
    TRUE
  37. Transcription is carried out by RNA polymerase.
    TRUE
  38. Sigma factor of RNA polymerase is required to recognize a promoter. In a bacterium,   there is only one sigma factor.
    FALSE
  39. Transcriptional   activator helps RNA polymerase to transcribe and repressor inhibits RNA   polymerase from transcription.
    TRUE
  40. In order   for a transcriptional activator to work, the interaction between the protein   and RNA polymerase is a must.
    TRUE
  41. If you   want to translocate any protein across the cell membrane (or outer membrane),   you need always energy.
    TRUE
  42. Proteins are pretty big, so there is no way to be translocated across the cell   membrane without their being denatured.
    FALSE
  43. The amino   acid sequence of a protein contains all the folding information of the   protein.
    TRUE
  44. Some   bacteria secret proteins directly into host cytoplasm.
    TRUE
  45. Cell   inside is more reducing (low redox potential) than the outside.
    TRUE
  46. In DNA, you can find two types of base pairing: A-T and G-C. G-C pair is stronger than A-T   pair.
    TRUE
  47. In PCR, we use high temperature to separate two DNA strands.
    TRUE
  48. Rod-shaped cells
    -Are cells happy or Unhappy
    Happy
  49. Coccoid-shaped cells
    -Are the cells happy or unhappy?
    Unhappy
  50. Exponential   growth
    -Are the cells happy or unhappy?
    Happy
  51. Cells are more adhesive
    -Are the cells happy or unhappy?
    Unhappy
  52. Large-sized cells
    -Are the cells happy or unhappy?
    Happy
  53. Protein/RNA breakdown and resynthesis
    -Are the cells happy or unhappy?
    Unhappy
  54. More DNA per cell
    -Are the cells happy or unhappy?
    Happy
  55. Less ribosomes per cell
    Happy or unhappy?
    Unhappy

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