Spring 2012 Exam 1 V2 Key

Spring 2012 Exam 1 V2 Key - Biol 302 Exam 1 Version 2...

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Biol 302 Exam 1 Version 2 Answer key Name ________________________ February 7, 2012 1. True or False (Select A for True and B for False): The 3-D shape of a protein (conformation) is specified by the sequence of amino acids in the polypeptide chain and is unrelated to the function of the protein. 2. Which of the following statements regarding proteins is false ? a. there are 20 amino acids commonly found in proteins b. each amino acid has a different side group (also called an R group) and thus each has different properties c. amino acids in proteins are linked by covalent bonds called peptide bonds d. polypeptide chains can adopt many different conformations because there is free rotation around all the bonds in the polypeptide backbone, except the peptide bond e. none of the above 3. Number of centromeres per chromosome, Number of telomeres per chromosome a. 1, 1 b. 1, 2 c. 2, 2 d. 100s, 2 e. 2, 100s 4. Which of the following statements about histones is false ? a. DNA wraps approximately twice around a histone octamer b. chemical modifications of histone tails always results in reduced compaction of chromatin c. histone H1 (the linker histone) is responsible for further folding of the beads-on-a- string form of chromatin into the 30nm chromatin fiber d. histones are positively charged proteins e. the core histones package DNA into structural units called nucleosomes 5. Which of the following compartments contain DNA? a. nucleus b. mitochondria c. chloroplast d. all of the above e. only a and b 6. True or False (Select A for True and B for False): ATP is one of the most widely used activated carrier in cells. 7. True or False . Choose a for True and b for False. In eukaryotic cells, it is often the case that a set of adjacent genes will be transcribed as a single RNA molecule. This set of adjacent genes is termed an operon. 1
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Listed below are a number of different types of bonds found in cells. Choose the correct answer for the next five questions from the list below. a. ionic b. hydrogen c. peptide d. covalent e. phosphodiester 8. This is a weak bond that is important to establish and maintain the structure of the alpha ( α ) helix and the beta sheet. ____ b ____ 9. When an electron is transferred from one atom to another, the resulting bond is called _____ a ________. 10. Amino acids in polypeptide chains are linked together via ____ c ________. 11. Both peptide and phosphodiester bonds are types of _______ d ______ bonds. 12. This is a type of covalent bond that links adjacent ribonucleotides found in a RNA molecule. _______ e _____ 13. Which of the following statements regarding DNA polymerase and RNA polymerase is true? a. both enzymes have proofreading activity
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Spring 2012 Exam 1 V2 Key - Biol 302 Exam 1 Version 2...

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