Cell biology exam II

Card Set Information

Author:
iishvo
ID:
251383
Filename:
Cell biology exam II
Updated:
2013-12-07 00:53:14
Tags:
exam cell bio
Folders:

Description:
cell bio daivs
Show Answers:

Home > Flashcards > Print Preview

The flashcards below were created by user iishvo on FreezingBlue Flashcards. What would you like to do?


  1. Of the three early models proposed for DNA replication, in which one was newly synthesized DNA incorporated into both template strands?
    A. semiconservative
    B. conservative
    C. dispersive
    C. dispersive
    (this multiple choice question has been scrambled)
  2. In differental centrifugation:
    A. revolution per minute (rpm) is kept constant, run time is varied
    B. rpm is varied, run time is kept constant
    C. rpm is varied, run time is varied
    B. rpm is varied, run time is kept constant
    (this multiple choice question has been scrambled)
  3. antibodies can be purified using a sucrose gradient centrifuged at:
    A. 50,000 rpm at 3 hr
    B. 10,000 rpm for 2 hr
    C. 20,000 rpm at 5 hr
    C. 20,000 rpm at 5 hr
    (this multiple choice question has been scrambled)
  4. during DNA replication, new nucleotides are always added at:
    A. the 2' hydroxyl of the preceding base
    B. the 3' hydroxyl of the preceding base
    C. the 5' phosphate oft he preceding base
    D. the 3' phosphate of the preceding base
    B. the 3' hydroxyl of the preceding base
    (this multiple choice question has been scrambled)
  5. during lagging strand synthesis:
    A. one initial RNA primer is made
    B. many RNA primers are made
    C. one initial DNA primer is made
    D. many DNA primers are made
    B. many RNA primers are made
    (this multiple choice question has been scrambled)
  6. Okazaki fragments are:
    A. multiple RNA primers synthesized on the lagging strand
    B. multiple RNA primers synthesized on leading strand DNA
    C. short stretches of DNA synthesized on the lagging strand
    D. short stretches of DNA synthesized on the leading strand
    C. short stretches of DNA synthesized on the lagging strand
    (this multiple choice question has been scrambled)
  7. Proofreading of DNA synthesis takes place:
    a. in the 3' -> 5' direction
    b. in the 5' -> 3' direction
    a. in the 3' -> 5' direction
  8. proofreading of DNA synthesis is done by an enzyme other than DNA polymerase: 
    a. true
    b. false
    b. false
  9. the enzyme telomerase:
    A. synthesizes DNA from an RNA template
    B. (b and c)
    C. synthesizes DNA from a DNA template
    D. carries an RNA template
    B. (b and c)
    (this multiple choice question has been scrambled)
  10. Look at question 10-14 of exam I
    Review the figure of DNA replication fork
  11. What is a common sequence for a transcription promoter:
    A. TATA
    B. ATTA
    C. UUGU
    D. TUTU
    A. TATA
    (this multiple choice question has been scrambled)
  12. post-transcriptional modifications to eucaryotic mRNA include:
    a. 7-methylguanosine addition
    b. polyadenylation
    c. methylation of ribose
    d. all of the above
    d. all of the above
  13. the codon for initation of mRNA translation is:
    A. UGA
    B. UAG
    C. UAA
    D. AUG
    D. AUG
    (this multiple choice question has been scrambled)
  14. Amino acids coded for by only one codon include:
    A. histidine
    B. leucine
    C. tyrosine
    D. tryptophan
    D. tryptophan
    (this multiple choice question has been scrambled)
  15. the point mutation responsible for sickle cell anemia induces the following amino acid change in the b subunit of hemoglobin.
    A. trp -> lys
    B. met -> pro
    C. val -> asp
    D. glu -> val
    D. glu -> val
    (this multiple choice question has been scrambled)
  16. the fully assembled ribosome contains three sites important in protein synthesis. one of these is the P site, which stands for:
    A. proline
    B. peptidyl-tRNA
    C. peptide
    D. purine
    B. peptidyl-tRNA
    (this multiple choice question has been scrambled)
  17. in procaryotes, the first amino acid in newly synthesized protein in always:
    a. n-formyl-methionine
    b. methionine
    a. n-formyl-methionine
  18. during the termination sequence of protein synthesis, _________ binds to the ribosome at the A site:
    A. aminoacyl-tRNA
    B. TFIID
    C. Rlease factor
    D. TFIIH
    C. release factor
    (this multiple choice question has been scrambled)
  19. control mechanisms of protein synthesis include:
    a. mRNA degradation
    b. RNA processing
    c. transcriptional control
    d. all of the above
    d. all of the above
  20. positive control of transcription in procaryotes can employ:
    A. catabolite activator protein
    B. (a and c)
    C. cAMP
    D. chromatin modification
    B. (a and c)
    (this multiple choice question has been scrambled)
  21. transcription regulators in drosophila include:
    A. redeye
    B. eve
    C. white
    D. giant
    D. giant
    (this multiple choice question has been scrambled)
  22. a reporter gene is used to:
    A. determine gene expression
    B. regulate transcription
    C. regulate translation
    D. create banded embryos
    A. determine gene expression and d. create banded embryos
    (this multiple choice question has been scrambled)
  23. steroid hormones:
    A. inhibit ribosome assembly
    B. act at the cell membrane
    C. do not require receptors
    D. act within the nucleus
    D. act within the nucleus
    (this multiple choice question has been scrambled)
  24. one way of controlling gene expression involves methylation of:
    A. thymine
    B. cytosine
    C. guanine
    D. adenine
    B. cytosine
    (this multiple choice question has been scrambled)
  25. mutations in somatic cells are inherited through the germ line:
    a. true
    b. false
    b. false
  26. types of mutations can include:
    A. mutation in regulatory regions
    B. (a and c)
    C. (a and b)
    D. horizontal transfer
    E. intron excision
    B. (a and c)
    (this multiple choice question has been scrambled)
  27. the ames test for chemical mutagens:
    a. measures lactose tolerance
    b. measures the back mutation His-> His+
    c. utilizes an E. coli auxotroph
    d. measures the foward mutation His+ -> His-
    b. measures the back mutation His-> His+
  28. gene duplication occurs through:
    A. recombination
    B. polyadenylation
    C. frame shift mutation
    D. point mutation
    A. recombination
    (this multiple choice question has been scrambled)
  29. exon shuffling:
    A. follows intron excision
    B. occurs during transcription
    C. involves transposon relocation
    D. occurs during recombination
    C. involves transposon relocation
    (this multiple choice question has been scrambled)
  30. in procaryotes, the sex pilus is coded for by a ___________.
    A. DNA virus
    B. plasmid
    C. RNA virus
    D. regulatory gene
    B. plasmid
    (this multiple choice question has been scrambled)
  31. Mobile genetic elements comprise approximately ________% of the human genome:
    A. 80%
    B. 1% 
    C. 20%
    D. 50%
    D. 50%
    (this multiple choice question has been scrambled)
  32. genetic differences between individuals can be determined by analyzing:
    A. rRNA
    B. SNPs
    C. G/C ratios
    D. total DNA sequences
    B. SNPs
    (this multiple choice question has been scrambled)
  33. stop codon sequences include:
    A. UGA
    B. (a and b)
    C. UAA
    D. UAG
    E. (a, b, and c)
    E. (a, b and c)
    (this multiple choice question has been scrambled)
  34. DNA binding motifs include:
    A. mediators
    B. leucine zippers
    C. homeodomains
    D. (b and c)
    E. (a and b)
    D. (b and c)
    (this multiple choice question has been scrambled)
  35. cancer can be the result of mutations induced by:
    A. telomeres
    B. (a and c)
    C. polycyclic aromatic hydrocarbons
    D. radiation
    B. (a and c)
    (this multiple choice question has been scrambled)
  36. procaryotic genes have exons and introns:
    a. true
    b. false
    b. false
  37. the transcription factor TFIID:
    A. binds at the initation site
    B. binds to the TATA box
    C. distorts dsDNA structure
    D. (a and c)
    D. (a and c)
    (this multiple choice question has been scrambled)
  38. the transcription factor TFIIH: 
    A. phosphorylates RNA polymerase III
    B. phosphorylates RNA polymerase I
    C. phosphorylates RNA polymerase II
    C. phosphorylates RNA polymerase II
    (this multiple choice question has been scrambled)
  39. only mature mRNA contain the following feature(s) can be exported from the nucleus:
    A. poly-t tail
    B. exon junction complex
    C. (a and c)
    D. cap binding protein
    E. (a and b)
    C. (a and c)
    (this multiple choice question has been scrambled)
  40. amino acids bind to tRNA through a(n) _______ bond:
    A. phosphodiester
    B. ionic
    C. disulphide
    D. aminoacyl
    D. aminoacyl
    (this multiple choice question has been scrambled)
  41. during protein synthesis, the small subunit of the ribosome:
    A. forms peptide bonds
    B. binds initiator tRNA
    C. (a and c)
    D. (a and b)
    E. matches incoming AA~tRNAs to mRNA codons
    C. (a and c)
    (this multiple choice question has been scrambled)
  42. Molecular chaperones:
    A. phosphorylate proteins
    B. glycosylate proteins
    C. degrade proteins
    D. fold proteins into their 3D shape
    D. fold proteins into their 3D shape
    (this multiple choice question has been scrambled)
  43. post-transcriptional controls on protein synthesis include:
    a. riboswitches
    b. miRNAs
    c. translation repressor proteins
    d. all of the above
    d. all of the above
  44. initiator tRNA binds to the ______ site on ribosomes:
    A. exit
    B. peptidyl-tRNA
    C. aminoacyl-tRNA
    B. peptidyl-tRNA
    (this multiple choice question has been scrambled)
  45. in eucaryotes, RNA polymerase I is responsible for synthesis of:
    A. rRNA
    B. tRNA
    C. mRNA
    A. rRNA
    (this multiple choice question has been scrambled)

What would you like to do?

Home > Flashcards > Print Preview