Heterochrony
1.is a change in the timing of development.
2.causes the morphology of closely related species to be the same.
3.is a different rate of growth in various body parts.
4.is a cause of mass extinction.
5.None of the options is correct.
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Which of the following is not true of viruses?
A. Viruses replicate by binary fission. B. Viruses are acellular. C. Viruses consist of one or more molecules of DNA or RNA enclosed in a coat of protein and sometimes in other more complex layers. D. Viruses can exist in two phases: intracellular and extracellular.
Substrates used by methanogens include H2 and CO2 as well as short-chain organic compounds such as ________.
A. methanol B. acetate C. formate D. All of the choices are correct.
________ mutations occur in the promoter or operator region of a gene or set of genes and affects the expression of the downstream genes without affecting the amino acid sequences of the gene products.
Fill in the blank(s) with the appropriate word(s).
Class II MHC genes code for
A. certain secreted complement components. B. all HLA antigens. C. self receptors recognized by natural killer cells. D. receptors located primarily on macrophages, dendritic cells, and B cells. E. All of these choices are correct.