#Question id: 182
#Unit 1. Molecules and their Interaction Relevant to Biology
Which amino acid is least likely to participate in acid-base catalysis?
#Question id: 12436
#Unit 10. Ecological Principles
A diagram of a food web, for the following questions. (Arrows represent energy flow and letters represent species.)
If this were a terrestrial food web, the combined biomass of C + D would probably be
#Question id: 2121
#Unit 2. Cellular Organization
Which of the following membrane activities requires energy from ATP hydrolysis?
#Question id: 12086
#Unit 10. Ecological Principles
The herbaceous plant Achillea lanulosa is widespread in the Northern Hemisphere. Phenotypic variation in the species has been extensively studied along an altitudinal gradient from sea level to over 3,000 meters. In California there is conspicuous variation in height; alpine plants are only several centimeters tall while those in the San Joaquin Valley may reach a height of 1.8 meters. Adaptation to different local environments also results in variation in physiological processes such as photosynthetic rate, resistance to cold, and the timing of dormancy.
The genetic polymorphism found in Achillea lanulosa is most likely maintained primarily by
#Question id: 18859
#Unit 13. Methods in Biology