Which of the following groups of photosynthetic bacteria are capable of oxygenic photosynthesis?
A. The cyanobacteria
B. The green bacteria
C. The purple bacteria
D. All of the choices are correct.
Answer: A
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Geographic biodiversity "hot spots"
A. have the highest vascular plant species richness and ?3 unique ecosystems. B. have the greatest number of species that have lost >50% of their original range. C. contain ?10% of the world's vascular plant species and have lost >50% of their original range. D. have ?1500 endemic plant species and have lost ?70% of the original habitat.
In which layer of the plant leaves does photosynthesis take place?
a. mesophyll b. xylem c. phloem d. epidermis
Vials of microorganisms that undergo the freeze-drying process, called ________, will remain preserved and viable for years.
A. sterilization B. pasteurization C. desiccation D. lyophilization E. flash freeze
Fraternal twins
A. have exact copies of each other's DNA. B. are usually of opposite sex. C. are only as alike as any other siblings. D. will usually occur at the first pregnancy.