Bio 2 Prac Exam 1

Bio 2 Prac Exam 1 - First Examination Bios 201 September...

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First Examination Bios 201 September 21, 2001 Part I. Each multiple choice question is worth 3 points. 1. Which one of the following statements concerning water is INCOR- RECT? (__X_) a. During hydrolysis of polysaccharides, water molecules are re- leased. (_____) b. The high heat capacity of water is due to the hydrogen bonds holding together water molecules. (_____) c. Water is the main electron donor during photosynthesis. (_____) d. A water molecule has two covalent bonds. (_____) e. Water diffuses toward solutions with a higher solute concen- tration (hypertonic solution). 2. Which one of the following monomers is NOT properly matched to its polymer? (_____) a. amino acid - polypeptide (_____) b. G-actin - microfilament (_____) c. nucleotide - DNA (__X__) d. intermediate filament protein - microtubule (_____) e. sugar - polysaccharide 3. Which one of the following statements concerning lipids and polysac- charides is FALSE? (_____) a. Special lipids and special polysaccharides each perform the function of energy storage. (_____) b. The type of covalent linkage between sugars (monosacchar- ides) in a polysaccharide determines whether it plays a structural or en- ergy storage role. (_____) c. Polysaccharides are sometimes covalently attached to lipids. (__X__) d. Polysaccharides are covalently attached to most cytosolic and extracellular proteins. (_____) e. Some polysaccharides and some lipids can perform a signal- ing role. 4. In which one of the following statements concerning ATP is INCOR- RECT?
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(_____) a. ATP is an allosteric ligand that inhibits an enzyme in glyco- lysis. (__X__) b. ADP and phosphate have more free energy than ATP. (_____) c. ATP is required for synthesis of peptide bonds. (_____) d. ATP is required for directed movement of organelles along actin filaments and microtubules. (_____) e. ATP is generated by catabolic pathways in the cytosol and mitochondria. 5. Which one of the following statements concerning protein structure is FALSE? (__X__) a. The secondary structure (alpha helix, beta sheet) is held to- gether by hydrogen bonds between polar amino acid side chains. (_____) b. The structure of the part of integral membrane proteins that crosses the phospholipid bilayer is, in most cases, an alpha helix. (_____) c. Tertiary and quaternary structures of protein use similar types of bonds to hold them together. (_____) d. The primary structure is the sequence of amino acids held to- gether by peptide bonds. (_____) e. The amino- (N- or NH 2 -) terminus of a polypeptide is syn- thesized first, the carboxy- (C- or COOH-) terminus is synthesized last. 6. Which one of the following statements concerning chaperones is IN- CORRECT? (_____) a. Chaperones are important for protein folding inside the cell. (_____) b. Chaperones are themselves proteins.
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Bio 2 Prac Exam 1 - First Examination Bios 201 September...

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