Which of the following pertains to Borrelia burgdorferi?
A.
Coccus
B.
Bacillus
C.
Spirochete
D.
Filament
C.
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Agricultural application of nitrogen fertilizer
A) reduces global warming by increasing the storage of carbon dioxide in plant biomass. B) increases global warming by increasing microbial respiration in agricultural soils. C) increases global warming by increasing the production of nitrous oxide (N2O) by denitrification in agricultural soils. D) has little to no effect on the carbon cycle.
The youngest leaf primordium is produced closest to the stem tip because:
A. Auxins are closest to the tip. B. The tip is elongating outward. C. The leaf primordial only respond to light. D. The primordial lack a sense of direction. E. Expansion genes do not function well in aging tissue.
Current thinking about the cause of Hutchinson-Gilford syndrome, which is a severe rapid aging condition, is that
A) the body is unable to secrete insulin. B) the part of the brain that controls aging is damaged. C) abnormal lamin A protein stresses the nuclear membrane, disturbing DNA repair such that mutations accumulate that cause the diseases of aging. D) a protein called progerin forms clumps in the brain in a way that removes DNA from the tips of telomeres, shortening chromosomes and lifespan.
Silicon is an element that, like carbon, has four vacancies in its outer electron shell and therefore has the same bonding chemistry as carbon. Silicon is not found to any significant degree in the molecules found in living systems, however
Does this difference arise because elemental carbon is more abundant than silicon? What other explanations are there for the preferential selection of carbon over silicon as the basis for the molecules of life?