What do both the C4 and CAM pathways of photosynthesis allow plants to do?
A) to perform photosynthesis in the absence of carbon dioxide
B) to outcompete C3 plants in cool, dry conditions
C) to keep stomata partially or completely closed during the hottest parts of the day
D) to take up carbon dioxide at night and then store it as an acid until the day
C
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Which of the following enzymes are NOT secreted by TH1 to activate macrophages?
A) granulocyte-monocyte colony stimulating factor B) interferon gamma C) TNF-? D) fibrin
Which of the following is NOT characteristic of a coliform?
A) facultatively aerobic B) gram-negative C) rod shaped D) resistant to chlorination
Any product of natural selection that increases the relative fitness of an organism in its environment is called a(n)
____.
a. neutral mutation b. adaptive trait c. founder effect d. speciation event e. polymorphic trait
The example of ocean and lake stickleback fishes indicates that morphology can be altered by
A) changing only the sequences of protein-coding genes. B) altering the expression of a gene that is associated with development in only some parts of the body. C) environmental factors (such as pollution). D) the elimination of a gene from a population, which leads to loss of the body armor.