Biology 1 Quiz 2
How many electron pairs does carbon share in order to complete its valence shell? A. 4 B. 1 C. 2 D. 8 E. 3
A.
In a single molecule of water, two hydrogen atoms are bonded to a single oxygen atom by: A. Polar Covalent Bonds B. Ionic Bonds C. Nonpolar Covalent Bonds D. Van Der Waals Interactions E. Hydrogen Bonds
A.
Humans can digest starch but not cellulose because: A. Humans harbor starch-digesting bacteria in the digestive tract B. Humans have enzymes that can hydrolyze the alpha glycosidic linkages of starch but not the beta glycosidic linkages of cellulose C. The monomer of starch is glucose, while the monomer of cellulose is glucose with a nitrogen-containing group D. The monomer of starch is glucose, while the monomer of cellulose is galactose. E. Humans have enzymes that can hydrolyze the beta glycosidic linkages of starch but not the alpha glycosidic linkages of cellulose
B.
The solution contains 0.0000001(10^-7) moles of hydroxyl ions [OH-] per liter. Which of the following best describes this solution? A. Basic H+ donor B. Neutral C. Basic H+ acceptor D. Acidic H+ acceptor E. Acidic H+ donor
B.
Based on your knowledge of the polarity of water molecules, the solute molecule depicted here is: A. Hydrophobic B. Without Charge C. Positively Charged D. Negatively Charged E. Nonpolar
C.
Which type of bond must be broken for water to vaporize? A. Both hydrogen bonds and ionic bonds B. Both polar covalent bonds and hydrogen bonds C. Polar covalent bonds D. Hydrogen Bonds E. Ionic Bonds
D.
Why does ice float in liquid water? A. The crystalline lattice of ice causes it to be denser than liquid water B. The high surface tension of liquid water keeps the ice on top C. Ice always has air bubbles that keep it afloat D. Hydrogen bonds stabilize and keep the molecules in ice farther apart than the water molecules of liquid water E. The ionic bonds between the molecules in ice prevent the ice from sinking
D.
Which of the following is not a polymer? A. Cellulose B. Starch C. DNA D. Chitin E. Glucose
E.