A certain species of pine tree survives only in scattered locations at elevations above 2800 meters in the western United States. To understand why this tree grows only in these specific places, an ecologist should _____
A) conclude that lower elevations are limiting to the survival of this species
B) study the anatomy and physiology of this species
C) investigate the various biotic and abiotic factors that are unique to high altitude
D) analyze the soils found in the vicinity of these trees, looking for unique chemicals that may support their growth
E) collect data on temperature, wind, and precipitation at several of these locations for a year
Answer: C
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You perform a cell free translation experiment like Nirenberg and Matthaei. You start with 60% C and 40%
A. What relative amount of radiolabeled proline do you expect in the translated polypeptides? A. 36% B. 22% C. 14% D. 28%
Which of the following statements regarding polarity in an egg is INCORRECT?
a. The animal pole forms the anterior end of the animal. b. The vegetal pole forms the posterior end of the animal. c. The animal pole forms the animal's gut. d. The vegetal pole forms internal structures. e. Polarity relates to development of body axes.
The most compelling evidence that the choanoflagellates give rise to animals is
A. similarity in DNA sequences B. that they are segmented C. that they are multicellular D. that they are not ancestral, i.e. animals are a polyphyletic group
If you eat a meal that is high in sugar, which hormone will stimulate your cells to remove the sugar from your blood?
A) Thyroxine B) Glycogen C) Insulin D) Glucagon E) Glucocorticoids