#Question id: 12958
#Unit 10. Ecological Principles
The Norway rat (Rattus Norvegicus), a widespread pest, was controlled for about a decade by the anticoagulant warfarin. This chemical substance, placed in food pellets, is absorbed by the intestinal tract and inhibits the clotting of blood. After a population decline for about 10 years, rat populations increased and stabilized. In one European population, as illustrated in the graph below, the percentage of rats resistant to warfarin has remained fairly stable over a number of years
Resistance to warfarin is governed by a dominant autosomal gene, R. More than 15 percent of the resistant animals are heterozygous at this locus (Rr). The table below indicates the response to warfarin and relative reproductive fitness of individuals that are homozygous or heterozygous for the dominant gene (R). The RR individuals have a 20-fold increase in vitamin K requirement over individuals.
Fitness is a measure of the reproductive success of a particular genotype. The highest fitness is 1.00.
The strong dependence of RR individuals on large quantities of vitamin K probably is responsible for
#Question id: 7291
#Unit 5. Developmental Biology
Five
different genes are known to specify floral organ identity in Arabidopsis: APETALA1 (AP1), APETALA2 (AP2), APETALA3 (AP3), PISTILLATA (PI),
and AGAMOUS (AG).
Which one of the following statement is incorrect?
#Question id: 664
#Unit 1. Molecules and their Interaction Relevant to Biology
Which is evidence that structures for proteins determined by X-ray crystallography represent the structures in solution?
#Question id: 10219
#Unit 6. System Physiology – Plant
The PSII reaction center leads to easily inactivation and damage by photoinhibition process while Photosystem I Is Protected from Active Oxygen Species, Why PSI protect from active oxygen species in compare to PSII
#Question id: 18370
#Unit 12. Applied Biology