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Lecture quizzes

skhal 21 preguntas

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Preguntas del test (21)

  1. 1Which property is not essential for the origin of life?
    1. AThe need to store information
    2. BThe need to duplicate information
    3. CThe need to change information
    4. DThe need to make proteins
    5. EThe need to convert into favorable reactions
  2. 2Why is it thought that ribozymes are likely to be a legacy from an ancestral RNA world?
    1. AThey are more stable than RNAs
    2. BWhen they act, they require the presence of protein cofactors
    3. CThey act without the participation of protein cofactors.
    4. DThey can be made spontaneously without a DNA template.
    5. EThey are made by proteins
  3. 3What was probably the first carrier of genetic information in primitive organisms?
    1. ADNA that could self-replicate
    2. BProteins
    3. CPolypeptides
    4. DRNA that could self-replicate
    5. ELipids
  4. 4________ can be used to purify transcription activator proteins
    1. AGel mobility shift assays
    2. BDNA affinity chromatography
    3. CCentrifugation
    4. DDNA footprinting
    5. EChIP assays
  5. 5Sequence specific DNA binding proteins frequently have a region that binds in the major groove because:
    1. AIt is smaller
    2. BIt contains sequence specific information
    3. CThe minor groove is not available
    4. DIt is positively charged
    5. EIt is negatively charged
  6. 6The following secondary structures are known to specifically interact with DNA (select all that apply):
    1. AAlpha helix
    2. BBeta sheet
    3. CUnstructured loops
    4. DDouble helix
  7. 7What happens at the lac operon in the absence of glucose and presence of lactose?
    1. ANo expression
    2. BLow expression
    3. CThe lac repressor binds the promoter
    4. DHigh expression
    5. EThe CAP protein doesn't bind to the promoter
  8. 8Multiple binding sites for a repressor is advantageous because:
    1. AThere are too many repressors in cells
    2. BDNA must be bent to allow transcription
    3. CRepressors are only active when bound to many sites at once
    4. DThis increases the effective concentration of the repressor
    5. ERepressors need multiple binding sites to bind ligands
  9. 9An operator is:
    1. AA protein
    2. BA protein binding site
    3. CThe same as a promoter
    4. DA type of repressor
    5. EThe start site for RNA synthesis
  10. 10Mammalian x-chromosome inactivation:
    1. AOccurs only in humans
    2. BPrevents females from being mosaics
    3. CIs not necessary
    4. DIs necessary for dosage compensation
    5. EOnly occurs in males

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Descripción
A compilation of all of the quizzes from lecture on relevant topics for the final. I forgot to write down the quizzes for topics 25 and 26 though so those are missing.
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skhal
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