#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: 2936
#Unit 2. Cellular Organization
The stable attachment of sister kinetochores to microtubules emanating from opposite spindle poles is called:
#Question id: 1092
#Unit 4. Cell Communication and Cell Signaling
Which of the following statements is true of steroid receptors?
#Question id: 5450
#Unit 8. Inheritance Biology
Which of these definitions of heritability is most correct?
#Question id: 882
#Unit 1. Molecules and their Interaction Relevant to Biology
Choose correct statements about thermophilic proteins
I. The proteins found in thermophilic species are much more stable than their mesophilic counterparts.
II. All thermostable proteins have such a high incidence of salt bridges
III. the most important of which are an increased size of the protein’s hydrophobic core, an increased size of the interface between its domains and/or subunits, and a more tightly packed core as evidenced by a reduced surface-to-volume ratio.
IV. Several of these thermostable enzymes have a superabundance of salt bridges on their surfaces.