Against which hard structure do the circular and longitudinal muscles of annelids work?
A) cuticle
B) shell
C) endoskeleton
D) hydrostatic skeleton
D
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When we compare levels of genetic variation in a contemporary African population to that of a contemporary non-African population, we find there is more variation in the African population. The reason we see this pattern is that:
A. non-African populations represent founder events. B. non-African populations have high mutation rates. C. non-African populations experience higher rates of natural selection than do African populations. D. African populations experience higher rates of natural selection than do non-African populations. E. African populations experience high rates of genetic drift.
What is the difference between the allosteric and torpedo models of eukaryotic transcritponal termination?
A. The allosteric model is that RNA pol II becomes destabilized after transcription of the poly A signal sequence while the torpedo model is that the polymerase is physically removed from the DNA B. The torpedo model is that RNA pol II becomes destabilized after transcription of the poly A signal sequence while the allosteric model is that the polymerase is physically removed from the DNA C. The allosteric model is that RNA pol II becomes destabilized after transcription of the stop codon sequence while the torpedo model is that the polymerase is physically removed from the DNA D. The torpedo model is that RNA pol II becomes destabilized after transcription of the stop codon while the allosteric model is that the polymerase is physically removed from the DNA E. The only difference between the two models is the proteins that are involved in removing the RNA pol II from the DNA
What traits do green algae and plants have in common?
_____ plastids. _____ chlorophyll a and b. _____ a sporic life cycle. _____ beta-carotene. _____ embryos.
Vascular plant bodies typically consist of a(n) ____ shoot system and a ____ root system
a. photosynthetic; photosynthetic b. nonphotosynthetic; photosynthetic c. photosynthetic; nonphotosynthetic d. nonphotosynthetic; nonphotosynthetic e. autotrophic; heterotrophic