The hypothesis that life began with the evolution of inorganic compounds into simple organic molecules, macromolecules, and protocells is called what?
A. chemical evolution
B. organic chemistry
C. speciation
D. Darwinian evolution
E. cell theory
Answer: A
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______ release the cytokines IL-1 and TNF, which activate _________.
A. Helper T cells, B cells B. Macrophages, complement C. Helper T cells, antigen presenting cells D. Macrophages, helper T cells E. Non-antigenic cells, CD4 cells
The rate of background extinctions is calculated to be species per year per million species.
A. 0.1 to 1.0 B. 1.0 to 10 C. 0.001 to 0.01 D. 10 to 100 E. None of the answer choices is correct.
Which of the following is the correct sequence of hierarchical taxonomic categories?
A. species - family - genus - domain - order - phylum - class - kingdom B. domain - kingdom - phylum - class - order - family - genus - species C. species - genus - family - order - class - order - phylum - kingdom - domain D. kingdom - class - phylum - order - family - genus - species E. kingdom - class - domain - order - phylum - genus - family - species
Why is the sporophyte generation better adapted to land than the gametophyte generation?
What will be an ideal response?