MTIAK - Chem 204 Mid-Term Exam I July 21, 2009 Name: Answer...

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

View Full Document Right Arrow Icon
Chem 204 Mid-Term Exam I July 21, 2009 Name: Answer Key Student ID: There are 3 sections to this exam: Answer ALL questions Section I: Multiple-Choice – 20 questions, 2 pts each Section II: Fill-in-the-Blank – 10 questions, 3 pts each Section III: Short Answer – 4 questions, 30 pts total Please make sure your exam paper is complete. Do not start writing exam until indicated.
Background image of page 1

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

View Full DocumentRight Arrow Icon
Section I : Multiple Choice (2 pts each) 1. The pH of a sample of blood is 7.4, while gastric juice is pH 1.4. 1. E The blood sample has: A) 0.189 times the [H + ] as the gastric juice. B) 5.29 times lower [H + ] than the gastric juice. C) 6 times lower [H + ] than the gastric juice. D) 6,000 times lower [H + ] than the gastric juice. E) a million times lower [H + ] than the gastric juice. 2. The three-dimensional structure of a protein is determined primarily by: 2. B A) electrostatic guidance from nucleic acid structure. B) the sequence of amino acids in the protein. C) how many amino acids are in the protein. D) hydrophobic interaction with lipids that provide a folding framework. E) modification during interactions with ribosomes. 3. All of the amino acids that are found in proteins, except for proline, contain a(n): 3. A A) amino group. B) carbonyl group. C) carboxyl group. D) ester group. E) thiol group. 4. During muscle contraction, hydrolysis of ATP results in a change in the: 4. B A) conformation of actin. B) conformation of myosin. C) structure of the myofibrils. D) structure of the sarcoplasmic reticulum. A) structure of the Z disk. 5. A compound has a p K a of 7.4. To 100 mL of a 1.0 M solution of this compound 5. D at pH 8.0 is added 30 mL of 1.0 M hydrochloric acid. The resulting solution is pH: A) 6.5 B) 6.8 C) 7.2 D) 7.4 E) 7.5
Background image of page 2
6. The peptide alanylglutamylglycylalanylleucine has: 6. C A) a disulfide bridge. B) five peptide bonds. C) four peptide bonds . D) no free carboxyl group. E) two free amino groups. 7. Enzymes are biological catalysts that enhance the rate of a reaction by: 7. B A) decreasing the amount of free energy released. B) decreasing the activation energy. C) increasing the activation energy. D) increasing the amount of free energy released. E) increasing the energy of the transition state. 8. Which of the following refers to particularly stable arrangements of amino acid 8. B residues in a protein that give rise to recurring patterns? A)
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.

This note was uploaded on 10/17/2011 for the course CHEM 653 taught by Professor Wei, robert during the Spring '11 term at Cleveland State.

Page1 / 9

MTIAK - Chem 204 Mid-Term Exam I July 21, 2009 Name: Answer...

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