The jaws of vertebrates evolved from the:
A. gill cartilage of jawless fish.
B. gill cartilage of ancient sharks.
C. cartilage supporting the nostrils of jawless
fishes.
D. ear bones of ancient fish.
E. first two vertebrae of ancient fish.
A
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The term homeostasis refers to the ability of:
A. molecules to undergo net movement by diffusion. B. the cell to seek out an optimal environment. C. the plasma membrane to control what enters a cell. D. the cell to control and maintain its internal environment.
During a microarray analysis, cDNAs made from normal cells are stained with a green fluor and
cDNAs from abnormal cells are stained with a red fluor. Which of the following statements is true about the results of this experiment?
a. Red spots indicate genes that are underexpressed in abnormal cells. b. Red spots indicate genes that are not expressed in abnormal cells. c. Red spots indicate genes that are overexpressed in abnormal cells. d. Red spots indicate genes that are overexpressed in normal cells. e. Red spots indicate pseudogenes.
Burning a log is an example of a combustion reaction. This type of reaction is a reverse reaction of photosynthesis. Based on this information, what products would be formed from burning a log?
A. carbon dioxide and water B. oxygen and carbon dioxide C. oxygen and water D. glucose and oxygen E. carbon dioxide and glucose
Oxygen has an atomic number of 8. This means that oxygen has ____
a. 8 electrons in its outer most shell b. 8 neutrons in its nucleus c. 4 protons and 4 neutrons in its nucleus d. 8 protons in its nucleus e. 8 protons and 8 neutrons in its nucleus