The human cerebral cortex accounts for what percentage of the total mass of the brain?
A) 20%
B) 40%
C) 60%
D) 80%
Answer: D
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Small size, in general, is necessary for all cells, whether prokaryotic or eukaryotic. Why?
a. The surface area to volume ratio limits the size of all cells. b. If cells were larger, they would be eaten by predators. c. Size is limited by electron orbitals. d. They are limited by the size of the ecosystem.
Which of the following includes most of the bacteria that cause human disease?
a. chemoautotroph b. chemoheterotroph c. photoautotroph d. photoheterotroph e. chemoautotroph and photoheterotroph
Cancer can originate in any area of the body. However, death rates are often highest for those cancers involving organs within the digestive, cardiovascular, and respiratory systems. This is most likely because
A. these organs play vital roles in maintaining homeostasis. B. there are no treatment options for these types of cancer. C. these organs are larger and therefore harder to treat. D. these organs are all involved in processing food, which is vital to our survival.
Which type of chemical bond exists within a water molecule?
A. weak B. covalent C. hydrogen D. ionic E. It depends on the temperature of the water.