Describe archaea methanogens
What will be an ideal response?
These chemoautotrophs form ATP by pulling electrons from hydrogen gas or acetate. The reactions produce methane (CH4), an odorless gas. Methanogenic archaea are strict anaerobes, meaning they cannot live in the presence of oxygen. They abound in sewage, marsh sediments, and the animal gut. Cattle have methanogens in their stomach and release methane gas by belching. About a third of people have significant numbers of methanogens in their intestine.
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Unbranched sporangiophores with rhizoids that appear opposite the point where the stolon arises at the base of the sporangiophore best describes which zygomycetes?
a. Mucor b. Rhizopus c. Lichtheimia d. Absidia
The nervous system of fish includes:
a. olfactory pits. b. taste receptors. c. eyes. d. otoliths. e. all of the above.
How is gel electrophoresis used to demonstrate the molecular basis of SCD?
A) by revealing that the protein products of the ?A and ?S alleles have distinctive electrophoretic band patterns B) by revealing variations in the length of a DNA restriction fragment that distinguishes the ?A and ?S alleles C) by revealing variations in the exon splicing of the mRNA products of the ?A and ?S alleles D) by revealing variations in the electrophoretic mobility of proteins and the restriction fragment length polymorphisms of DNA (both A and B) E) by revealing variations in the electrophoretic mobility of proteins, the restriction fragment length polymorphisms of DNA, and the splice variants of the mRNA (A, B, and C)
The number of animal phyla now recognized is about
A. 17. B. 67. C. 10. D. 35. E. 56.