3. Which of the following descriptions about Hb (hemoglobin) is      incorrect     ?
(A) One Hb can bind one O₂ molecules
(B) HbA has an α₂β₂ structure
(C) HbF has an α₂γ₂ structure
(D) HbA has a higher affinity for BPG than does HbF
(E) CO₂ reduces the binding affinity of Hb for O₂.

3.Which of the following descriptions about Hb (hemoglobin) is incorrect? (A) One Hb can bind 1 O2 molecules (B) HbA has an a2β2struc cture (C) HbF has an a2γ2 structure (D) HbF has a lower affinity for BPG than does HbA (E) CO2decreases the binding affinity of Hb for O2.

3.Which of the following descriptions about Hb (hemoglobin) is incorrect? (A) One Hb can bind 4 O2 measures (B)HbA has an α2β2 structure (C) HbF has an α2γ2 structure(D) HbF has a higher affinity for BPG than dose HbA (E) Reducing the pH decreases the binding affinity of Hb for O2.

3. Which of the following descriptions about Hb (hemoglobin) is incorrect? (A) One Hb can bind 4 O2 molecules (B) HbA has an a2β2 structure (C) HbF has an α2γ2 structure (D) HbF has a higher affinity for BPG than does HbA(E) CO2 reduces the binding affinity of Hb for O2.

3. Which of the following descriptions about Hb (hemoglobin) is incorrect? (A) One Hb can bind 4 O2 molecules (B) HbA has an α2β2 structure (C) HbF has an α2y2 structure (D) HbF has a lower affinity for BPG than does HbA (E) CO2 increases the binding affinity of Hb for O2.

4. Which of the following descriptions about the Michaelis-Menten rate equation is      incorrect     ? (A) KM measures the substrate concentration at which the reaction rate is Vmax/2 (B) kcat is the turnover number that measures the rate of the catalytic process (C) The ratio kcat/KM is a convenient measure of enzyme efficiency (D) kcat = Vmax/[Enz] (E) A competitive inhibitor decreases the apparent KM.

5. To visualize protein bands on SDS-PAGE, ______ is commonly used to stain proteins after gel electrophoresis. (A) Coomassie Brilliant Blue (B) EtBr (C) NADH (D) CNBr (E) BUdR.

6. A DNA segment of 100 base pairs in the A form. What is its approximate molecular weight?_______kD. (A) 33 (B) 65 (C) 330 (D) 650 (E) 3,300 

7. Absorbance at ______ nm is frequently used to determine the concentration of RNA. (A) 200 (B) 260 (C) 280 (D) 400 (E) 540.

8. Which of the following compounds has the highest molecular weight? (A) adenine (B) adenosine (C) adenylate (D) uracil (E) uridine.

9. Which of the following descriptions regarding disaccharide is incorrect? (A) Sucrose is α-D-glucopyranosyl (1→4) β-D-fructofuranoside (B) Sucrose is a nonreducing sugar (C) Maltose has an α(1→4) linkage (D) Cellobiose is β-D-glucopyranosyl (1→4) β-D-glucopyranose (E) Lactose is a reducing sugar.

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