1. Assuming that P50=26 torrs , under conditions where pO=30 torrs, the average number of O2 molecules bound per hemoglobin molecule is closet to
a. 0.5
b. less than 1
c. almost 2
d. greater than 2
e. greater than 3
2. In an aqueous solution at pH 7, a peptide containing 1 amino group side chain & 2 carboxyl group side chains would have which of the following net charges
a. 2+
b. 1+
c. 0
d.1-
e. 2-
3. Which of the following statements BEST describes the strength of cardiac muscle contraction ? It is
a. decreased when extracellular Ca++ is increased
b. increased when extracellular Ca++ is increased
c. mainly regulated regulated by vagal impulses
d. unaffected by extracellular Ca++
e. mainly regulated by heart rate
a. 0.5
b. less than 1
c. almost 2
d. greater than 2
e. greater than 3
2. In an aqueous solution at pH 7, a peptide containing 1 amino group side chain & 2 carboxyl group side chains would have which of the following net charges
a. 2+
b. 1+
c. 0
d.1-
e. 2-
3. Which of the following statements BEST describes the strength of cardiac muscle contraction ? It is
a. decreased when extracellular Ca++ is increased
b. increased when extracellular Ca++ is increased
c. mainly regulated regulated by vagal impulses
d. unaffected by extracellular Ca++
e. mainly regulated by heart rate
