While the pH of saliva ranges from 6.5 to 11.5, the pH in the stomach is about pH 2. What would you expect the optimum pH to be for the enzymes secreted into your stomach that digest proteins into amino acids?
What will be an ideal response?
pH of the stomach is between 1 & 2, so optimum pH would fall within that range.
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Triploblastic are animals that
A. form three separate blastulas from a single embryo. B. produce three eggs, each of which forms a single blastula. C. form three blastopores in each blastula. D. have a blastula composed of three cells. E. have three germ layers.
Production of the iron-storing protein ferritin is regulated by aconitase, which binds to a 30-nucleotide sequence at the beginning of the ferritin mRNA and interferes with ribosome binding. Aconitase must be a
A. RNA interference protein. B. transcription repressor protein. C. translation repressor protein. D. translation initiation protein.
In basidiomycetes, the equivalent of fertilization occurs _____.
Fill in the blank(s) with the appropriate word(s).
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?