The CO2 produced in respiration comes mainly from
A. glycolysis.
B. the Krebs cycle.
C. the electron transport chain.
D. All of the above processes generate CO2.
Ans: B. the Krebs cycle.
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In both lichens and mycorrhizae, what does the fungal partner provide to its photosynthetic partner?
A) carbohydrates B) fixed nitrogen C) antibiotics D) water and minerals E) protection from harmful ultraviolet light
The pollen grains of pine each consists of three cells
____________________ Indicate whether the statement is true or false.
Geographic biodiversity "hot spots"
A. have the highest vascular plant species richness and ?3 unique ecosystems. B. have ?1500 endemic plant species and have lost ?70% of the original habitat. C. have the greatest number of species that have lost >50% of their original range. D. contain ?1500 vascular plant species and have lost >50% of their original range.
Which of the following statements regarding the process of speciation is correct?
(A) Speciation occurs so slowly that scientists have never observed the emergence of a new species (B) Speciation only occurs slowly as small genetic changes accumulate from generation to generation (C) Speciation can occur as a result of changes in a single gene (D) Speciation requires the geographic isolation of a small population from a larger parent population