How do Cyanobacteria impact the ecology of both aquatic and terrestrial environments on Earth?
What will be an ideal response?
Answer: Cyanobacteria can contribute up to 80% of photosynthesis in some aquatic environments. They are also especially important in extreme terrestrial environments that are characterized by high salinity, extremely low moisture, extreme temperatures, and/or high UV irradiation. For example, they are the main photosynthetic organisms in photosynthetic soil crusts in the deserts and in the dry valleys of Antarctica. In addition to contributing to primary productivity, many species are also able to fix nitrogen. The addition of both nitrogen and carbon to ecosystems is critical for productivity. Their ability to fix nitrogen (which eukaryotic organisms CANNOT do on their own) increases primary productivity in environments with very low N.
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In which of the following regions in the host bacterium are you most likely to find Bdellovibrio?
A. The cytoplasm B. The nucleoid C. The cell nucleus D. The space between the cell wall and plasma membrane
After processing of pre-mRNAs, the regions that are retained in finished mRNAs are called ____
a. UTRs b. snRNPs c. exons d. domains e. introns
If N2 gas comprises 79 percent of atmospheric air at sea level, what is PN2?
a. about 300 mm Hg b. about 400 mm Hg c. about 500 mm Hg d. about 600 mm Hg e. about 700 mm Hg
Among the protist groups below, which has organisms that typically move with one or more flagella?
a. amoebozoa b. diplomonads c. apicomplexans d. foraminifera e. actinopods