Biol 203 Final part 1 Correct Questions & Answers(RATED A)

Sodium ions (Na+) are __________ to cross a pure phospholipid bilayer because they are _________. a. able, nonpolar b. unable, charged c. able, charger d. unable, nonpolar - ANSWER b The partial negative charge at one end of a water molecule is attracted to the patrial positive charge of another water molecule. What is this attraction called? a. a hydrogen bond b. a covalent bond c. an ionic bond d. a van der Waals interaction - ANSWER a A solution with a pH of 5 has __________ protons in it than a solution with a pH of 2 a. 1000 times more b. 1000 times less c. 100 times more d. 100 times less - ANSWER b If a double-stranded DNA sample was composed of 30 percent thymine, what would be the percentage of guanine? a. 10 b. 20 c. 40