A nucleosome is a linear chromosome wound around the
A. nuclear membrane.
B. nucleolus.
C. mRNA.
D. histone.
E. rRNA.
Answer: D
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When differentiation occurs, cells may also change in
_____ genetic content. _____ size. _____ shape.
What is thought to be the origin of mitochondria and chloroplasts?
A. Cyanobacteria for mitochondria, purple bacteria for chloroplasts B. Purple bacteria for mitochondria, fungi for chloroplasts C. Purple bacteria for mitochondria, cyanobacteria for chloroplasts D. Algae for mitochondria, cyanobacteria for chloroplasts
In Lake Victoria, hundreds of cichlid fish species arose after the lake last dried up 12,400 years ago. This is an
example of ____.
a. sympatric speciation b. the founder effect c. gene flow d. genetic drift e. allopatric speciation
What is an effect of continental drift on biological species?
a. It results in mass extinctions. b. Over time, an organism adapted to a particular climate may find it difficult to survive in the climate change associated with continental drift. c. Continental drift led to the evolution of humans. d. Continental drift limits our view of natural selection. e. It limits diversification of biological species.