What diffuses from the air in the alveoli into the blood?
A. water
B. nitrogen
C. oxygen
D. carbon dioxide
E. methane
Answer: C
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Answer the following statements true (T) or false (F)
1. Most oncogenes encode proteins that function in cell growth signaling pathways. 2. Myc genes tend to be overexpressed in only a few forms of cancer. 3. p53 is a tumor suppressor gene that acts as a sensor of DNA damage. 4. Certain types of cancer are caused by viruses.
Which of the following are atmospheric greenhouse gases?
A. methane B. carbon dioxide C. nitrous oxide D. chlorofluorocarbons E. all of the choices
You find a protist that has a single flagellum surrounded by a collar of microvilli. You correctly conclude that this
organism is a(n): a. plasmodial slime mold. b. cellular slime mold. c. choanoflagellate. d. foraminiferan. e. alveolate.
Where in a diatom would you find its yellowish photosynthetic pigment?
A. in the plasma membrane B. in the cytoplasm C. in the cell wall D. in the nucleus E. in chloroplasts