CH369 exam1s05 - CH369 Exam 1 answer key Multiple Choice...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
CH369 Exam 1 answer key Multiple Choice Use Scantron sheet for your answers. Amino acid α -carboxyl group pK α -carboxyl group pK R-group pK Ala 2.3 9.7 Arg 2.2 9.0 12.5 Asn or Gln 2.1 9.0 Asp or Glu 2.2 9.8 4.0 Cys 1.7 10.8 8.3 His 1.8 9.2 6.0 Ser 2.2 9.2 Tyr 2.1 9.1 10.1 1. Referring to the table above: Which of these amino acids could act as a good buffer at pH = 4.5 a. Alanine b. Arginine c. Asparagine d. Cysteine e. Aspartic Acid 2. Referring to the table above: Which one will have an overall charge of -1 at a pH of 7? a. Alanine b. Arginine c. Histidine d. Tyrosine e. Aspartic Acid 3. The overall folding of a single protein subunit is called: a. Primary Structure b. Secondary Structure c. Tertiary Structure d. Quaternary Structure e. All of these 4. Nucleosides contain all of the following except : a. Phosphates b. Purines c. Pyrimidines d. Sugars e. All of these are found in nucleosides
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
5. The T m for melting the double helix is: a. The temperature at which the helix starts to open. b. The midpoint of the range over which the helix denatures. c. The temperature at which the helix is completely open. d. The energy needed to melt the DNA. e. None of these is correct. Cys-Ala-Gly-Arg-Gln-Met Referring to the peptide above: 6. The carboxyl terminal end is: a. Arg b. Cys c. Gln d. Met e. None of these. 7. The amino terminal amino acid is: a. Arg b. Cys c. Gln d. Met e. None of these. 8. The following amino acid causes a kink or bend in the α -helix. a. Ala b. Glu c. Lys d. Pro e. Trp 9. Data used to determine the double helix structure of DNA included all of these, except : a. The concentrations of purines and pyrimidines are equal. b. The bases can pair by hydrogen bonding. c. Model building. d. Dimensional data from X-ray diffraction studies. e. All of these were important in determining the structure of DNA.
Background image of page 2
10. Restriction enzymes are especially useful for genetic recombination work, for all of these reasons, except : a. They cut DNA in the middle of specific sequences. b. They cut DNA independent of the source of the DNA. c. They can generate single stranded tails or "sticky ends". d. There are a large variety of them commercially available. e. All of these traits make restriction enzymes useful. 11. The following item was the most important one for the development of PCR as a commercially successful and widely-used procedure: a. Taq DNA polymerase. b. Heat-resistant DNA. c. Heat-resistant primers for DNA synthesis. d. Robotic machines to run the PCR procedure. e. Heat-resistant nucleoside triphosphate substrates. 12. Forensic uses of DNA to identify victims or criminals exploit the following trait in DNA: a. Differences in sizes of DNA fragments (RFLPs). b. Footprinting.
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 11

CH369 exam1s05 - CH369 Exam 1 answer key Multiple Choice...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online