According to the old Linnaean scheme of classifying the living world into either animals or plants, any organism that could photosynthesize was considered a plant. What kingdoms in the new system contain photosynthetic organisms and what criteria are now used to group them?
What will be an ideal response?
Several forms of photosynthesis take place in Eubacteria and one (using rhodopsin) has been identified in Archaebacteria. These organisms are classified according to their structure (prokaryotic) and their biochemistry (lipids, cell wall materials, ribosomal components, etc.). A number of groups in the Protista have the capacity for photosynthesis, but very taxonomically different members have gained the ability by acquiring a photosynthetic endosymbiont. The organisms are therefore also classified by structure, biochemistry, and DNA sequence similarities. A complete answer would probably address the special characteristic of Chromista, and the unicellular motile groups (euglenoids and dinoflagellates).
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You find a new species of mouse that, compared to the house mice you are familiar with, sprints extraordinarily rapidly but also fatigues quickly. Which type of muscle fiber (compared to an ordinary house mouse) would you expect to see an increase in?
A. slow oxidative fibers B. slow glycolytic fibers C. fast oxidative fibers D. fast glycolytic fibers E. fast and slow oxidative fibers
The island biogeography model of Robert MacArthur and E.O. Wilson predicts a higher value of ?, the equilibrium number of species, for larger islands close to a source pool and a lower value of ? for small islands far from the source pool. Their reasoning for these predictions is that larger islands support larger populations, lowering the risk of extinction, while closer islands have higher immigration rates because the immigrants do not have to travel as far. What other reasons could you give to justify their predictions? Check all that apply.
_____ Larger islands tend to support species that are more adaptable and therefore, less prone to extinction. _____ Larger islands tend to have a more varied physical environment, creating more ecological niches. _____ Closer islands are more likely to have intermediate levels of disturbance, increasing diversity. _____ Larger islands act as larger "targets" for colonization; immigrants are more likely to land on a larger island than a smaller one _____ Closer islands are more likely to receive immigrants of species already present on the island, and this continued immigration can rescue species that might have otherwise gone extinct.
Which membrane reduces friction in joints?
a. serous b. cutaneous c. mucous d. synovial e. tissue
First part of the small intestine_______________________
Fill in the blank(s) with the appropriate word(s).