Marsh periwinkles are able to survive out of the water because their ________ can absorb oxygen from the air
a. muscular foot
b. mantle cavity
c. radula
d. operculum
b
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A gene that determines the heaviness of a man's beard is
A) X-linked. B) sex-limited. C) sex-influenced. D) Y-linked.
A mutation in the promotor region of a gene can result in cancer. Which of these scenarios results in cancer?
a. The mutation is in the promoter region for an enzyme that metabolizes starch, such as amylase. Starch digestion is disrupted. b. The mutation is in the promoter region for a protein that controls rebuilding of the telomeres. As a result, these cells die prematurely. c. The mutation is in the promoter region for a protein that controls a key gate-keeper in the cell cycle. Without the gate-keeper, the cell blows through that checkpoint and continues with growth, unchecked. d. The mutation is in the promoter region for a calcium channel in the cell membrane of bone cells. The result of the mutation is a buildup of excess calcium in the extracellular space.
Which of the following is produced during the light reactions of photosynthesis?
A) O2 B) CO2 C) C6H12O6 D) ADP
The pH of blood is maintained by the respiratory and excretory system. What is the normal pH of blood?
A. 5.2 B. 6.4 C. 6.8 D. 7.4 E. 8.6