Some crenarchaeotes have growth optima above the boiling point of water (at atmospheric pressure)
Indicate whether the statement is true or false.
Answer: TRUE
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If plants consume CO2 during photosynthesis, why hasn't all the atmospheric CO2 been used up? Select all that apply
A. Photosynthesis also produces CO2 as a product. B. Respiration produces CO2 as a product. C. Both photosynthesis and respiration produce CO2 as a product. D. Plants actually don't use CO2 during photosynthesisâ€"they use O2. E. Photosynthesis and respiration use one another's products as reactants.
The nitrogenous base that is in RNA but not in DNA is
A) thymine. B) thiamine. C) uracil. D) urea.
Plant species regularly hybridize in nature, but only some crosses result in new polyploid species. Of the crosses below, if each one occurred, which would be most likely to result in a new stable polyploid species?
A. A cross between a species with a CC genome and a species with a DD genome, forming a hybrid with a CD genome. B. A cross between a species with a BB genome and a species with a DD genome, followed by a doubling of chromosomes, forming a hybrid with a BBDD genome. C. A cross between a 4n gamete and a 1n gamete, forming a 5n hybrid. D. A cross between a 2n gamete and a 1n gamete, forming a 3n hybrid.
All of the following structures arise from placodes, EXCEPT
A. Lens of Eye B. Membranous Labyrinth of Inner Ear C. Neurohypophysis D. Olfactory Mucosa of Nose E. Vestibular Ganglia of Inner Ear