A phospholipid has a hydrophilic head and two hydrophobic tails.
a. true
b. false
Ans: a. true
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How do the lungs absorb oxygen from the air while releasing carbon dioxide from the blood?
a. Oxygen diffuses into capillaries passively, while carbon dioxide is expelled from the body by the action of respiratory enzymes. b. Transport proteins in the plasma membranes of alveoli cells actively transfer oxygen into the blood and carbon dioxide into the lungs. c. Partial pressure gradients between alveoli and capillaries cause oxygen and carbon dioxide to diffuse in opposite directions. d. Carbon dioxide is not present in capillaries; it is synthesized from oxygen within the alveoli cells within the lungs.
How does the fossil record provide evidence for evolution?
a. By showing similarity of structures in organisms that show the same basic form b. By showing the convergence of forms in living organisms c. By showing the similarity of DNA sequences of related organisms d. By determining the age of fossils, the fossil record shows the evolution of form over millions of years
Which of the following is involved in forming the tertiary structure of proteins?
a. H bonds b. Hydrophobic interactions c. Ionic bonds d. All of the above
Ig stands for __________.
Fill in the blank(s) with the appropriate word(s).