Which group is commonly referred to as the "seaweeds"?
A) Ciliates
B) Water molds
C) Brown algae
D) Phytoplankton
E) Cyanobacteria
C
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Alan Cooper, Cécile Mourer Chauviré, Geoffrey Chambers, Arndt von Haeseler, Allan Wilson and Svante Pääbo investigated the evolutionary relationship among some extinct and living species of flightless birds. They concluded that kiwis are more closely related to African and Australian flightless birds than they are to the moas. What hypothesis did they propose from this conclusion?
A. That their data was incorrect and the sample from the museum was corrupted. B. That flightless birds only occurred once in New Zealand. C. That New Zealand was colonized twice by ancestors of flightless birds. D. That the South American species ancestors flew to New Zealand before the flightless mutation occurred. E. That the North American flightless bird originated from an ancestor of the New Zealand species.
In patients who receive transplants, the recognition protein in the transplanted organ would be different than that of the recipient. What would this mean for the patient?
1.The patient would begin to recognize the new protein as self.
2.The patient’s immune system would attack and reject the new organ, requiring the patient to take immune suppressing medication.
3.The protein of the transplanted organ must be changed to match that of the patient.
4.The proteins on the surface of the cells from the transplanted organ will modify themselves to more closely resemble those of the patient, so the patient’s immune system wouldn’t reject it.
Sarah observed that the mystery pond organisms never come up to the pond's surface. If she catches one of these organisms and observes closely, perhaps dissecting the organism, she should find _____
A) gills B) spiracles C) tracheae D) book lungs
The concentration of a solution expresses the amount of solvent present.
Answer the following statement true (T) or false (F)