________________ links amino acids to the tRNA molecule.
a) Amino-glycosidase
b) Peptidyl transferase
c) Aminoacyl-tRNA synthetase
d) Glutamine synthetase
Answer: c) Aminoacyl-tRNA synthetase
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Which of the following NOT a function of a nervous system?
a. communication b. interpretation of information c. detection of changes in the internal environment d. monitoring changes in the external environment e. regenerating nerve nets
Which of the following is mismatched?
a. cytokinin; inhibits lateral root formation b. auxin; promotes cell elongation c. gibberellin; involved in phototropism and gravitropism d. abscisic acid; promotes stomatal closure e. ethylene; promotes leaf abscission
If you were to design a long-term research study to determine why there are no human births in Lapland during the months of August, September, and October, you would need to also examine a comparison population of humans in which births took place every month. The primary reason for including a comparison population within the design of this experiment would be to:
A. test the effects of more than one variable at the same time. B. act as a control that would ensure that the results obtained are due to a difference in only one variable. C. prove that there are no births in Lapland during August, September, and October. D. accumulate more facts that could be reported to other scientists.
Alan Cooper, Cécile Mourer Chauviré, Geoffrey Chambers, Arndt von Haeseler, Allan Wilson and Svante Pääbo investigated the evolutionary relationships 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 new hypothesis did they propose based on this conclusion?
A. That flightless birds only occurred once in New Zealand. B. That New Zealand was colonized twice by ancestors of flightless birds. C. That the North American flightless bird originated from an ancestor of the New Zealand species. D. That their data was incorrect and the sample from the museum was corrupted. E. That the South American species' ancestors flew to New Zealand before the flightless mutation occurred.