2. A repeating structural unit in a multimeric protein is known as a(n):
(A) domain
(B) motif
(C) oligomer
(D) protomer
(E) subunit.

2. A repeating structural unit in a multimeric protein is known as a(n): (A) domain. (B) motif. (C) oligomer. (D) protomer. (E) subunit.

3. When oxygen binds to a heme-containing protein, the two open coordination bonds of Fe2+ are occupied by (A) one O atom and one amino acid atom (B) one O2 molecule and one amino acid atom (C) one O2 molecule and one heme atom (D) two O atoms (E) two O2 molecules.

4. Which of the following parts of the IgG molecule are not involved in binding to an antigen? (A) Fab (B) Fc (C) Heavy chain (D) Light chain (E) Variable domain

5. How is trypsinogen converted to trypsin? (A) A protein kinase-catalyzed phosphorylation converts trypsinogen to trypsin (B) An increase in Ca2+ concentration promotes the conversion (C) Proteolysis of trypsinogen forms trypsin (D) Trypsinogen dimers bind an allosteric modulator, cAMP, causing dissociation into active trypsin monomers (E) Two inactive trypsinogen dimers pair to form an active trypsin tetramer.

6. Which of the following is not a reducing sugar? (A) Fructose (B) Glucose (C) Glyceraldehyde (D) Ribose (E) Sucrose.

7. In DNA sequencing by the Sanger (dideoxy) method (A) radioactive dideoxy ATP is included in each of four reaction mixtures before enzymatic synthesis of complementary strands (B) specific enzymes are used to cut the newly synthesized DNA into small pieces, which are then separated by electrophoresis (C) the dideoxynucleotides must be present at high levels to obtain long stretches of DNA sequence (D) the role of the dideoxy CTP is to occasionally terminate enzymatic synthesis of DNA where Gs occur in the template strands (E) the template DNA strand is radioactive

8. Which of the following contains an ether-linked alkyl group? (A) Cerebrosides (B) Gangliosides (C) Phosphatidyl serine (D) Platelet-activating factor (E) Sphingomyelin

9. A compound containing N-acetylneuraminic acid (sialic acid) is (A) cardiolipin (B) ganglioside GM2 (C) phosphatidylcholine (D) platelet-activating factor (E) sphingomyelin

10. Which of these statements about the composition of biological membranes is false? (A) In a given eukaryotic cell type (for example, a hepatocyte), all intracellular membranes have essentially the same complement of lipids and proteins (B) The carbohydrate found in membranes is virtually all part of either glycolipids or glycoproteins (C) The plasma membranes of the cells of vertebrate animals contain more cholesterol than the mitochondrial membranes (D) The ratio of lipid to protein varies widely among cell types in a single organism (E) Triacylglycerols are not commonly found in membranes

11. Ubiquitin is a (A) component of the electron transport system (B) protease (C) protein kinase (D) protein phosphorylase (E) protein that tags another protein for proteolysis

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