How are sister chromatids connected to each other?
A. through the centrioles
B. through cohesion proteins
C. through complementary base pairing of DNA at the centromere
D. through centromere proteins that are attracted to each other by opposite charges
E. through activated cyclin/CDK complexes
Answer: B
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When certain bodies of water develop regions known as "dead zones" it often means that:
A. Oxygen has been depleted. B. Carbon dioxide is not available. C. Nitrogen has become limited. D. Phosphorus has killed animals. E. Plant life no longer can survive.
A species that has population levels so low it faces extinction in all or part of its range is designated as ____.
A. riparian B. endemic C. endangered D. threatened E. an indicator
Mollusk eyes and vertebrate eyes are
A. analogous structures, because they have the same function but derive from different common ancestors. B. homologous structures, because they are derived from the same common ancestor. C. homologous structures, because they have different functions. D. analogous structures, because they arise from the same structures during development.
Plant cell walls consists mainly of ________.
A. chitin B. peptidoglycan C. cellulose D. chlorophyll