Commensalism is best described as a(n)
A. unsuccessful microbial invasion due to the presence of preexisting microbes.
B. relationship between two organisms where only one member benefits.
C. relationship between two organisms where both members benefit.
D. relationship in which a microorganism causes disease.
E. source of contamination.
Answer: B
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In the figure above, which species is the stronger competitor?
A) species 1 B) species 2 C) Both species compete equally. D) It is not possible to tell from this figure.
A mutation results in the loss of the finger-like cell wall ingrowths found in normal placental transfer tissues. What effect is this mutation most likely to have on the development of the embryo?
A. The embryo will develop at a slower rate because the rate of nutrient transfer from mother to embryo will be decreased. B. The embryo will develop too quickly because the rate of nutrient transfer from mother to embryo will be increased. C. The embryo will be unaffected because plant embryos are not dependent on transfer of nutrients from maternal tissues. D. The embryo will be unaffected because the cell wall ingrowths of placental transfer tissues have no effect on nutrient transfer from maternal tissues. E. The embryo will be unable to develop because necessary sugars can no longer be transported across the plasma membrane.
The cells that function in phloem are:
a. vessels b. sieve elements c. adjunct cells d. sclereids e. periderm
According to the IUCN Red List, what group of living organisms is most greatly threatened by extinction?
A. coral reefs B. birds C. conifers D. amphibians E. mammals