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Water softeners often replace calcium ions in hard water with sodium ions. Since sodium compounds are soluble, the presence of sodium ions in water does not cause the white, scaly residues caused by calcium ions. However, calcium is more beneficial to human health than sodium. Calcium is a necessary part of the human diet, while high levels of sodium intake are linked to increases in blood pressure. The FDA recommends that adults ingest less than 2.4 g of sodium per day. How many liters of softened water, containing a sodium concentration of 0.050% sodium by mass, have to be consumed to exceed the FDA recommendation? (assume a density of 1.0 g/ml for water).
Examine of the bases of a sample of nucleic acid yielded these percentages: A= 20%, G= 30%, C= 20%, T= 30 percent. Explain why is the sample single stranded DNA.
Briefly compare similarties in the release of the contents of cortical granules during the fertilization of the sea urchin ovum, with the release of neurotransmitters from terminal knobs of a stimulated neuron.
Construct a flow chart only using text to summarize the ATP,FADH2 and NADH in the Krebs cycle. Making sure to include the number of carbons found at each stage.
A patient has a stenotic mitral valve which has a reduced effective orifice area of 1.0 cm^2. The systolic ejection period is 330 milliseconds with a heart rate of 70 beats/min.
Tay Sachs disease is inherited as an autosomal recessive. It is a devastating neurological disease that results from the lack of a normal enzyme "A" whose job is to metabolize lipids that are found in brain cells.
cross a tru breeding sepia eyed female to a true breeding scarlet eyed male. then cross a F1 male to a F1 female. give the scheme of the cross, the resulting F2 phenotypes and their percentages.
The time-of-entry mapping method was used to determine the first five markers transferred from each Hfr during a synchronized conjugation experiment. The markers and their transfer order form each Hfr are shown below.
A homozygous claret (ca=ruby eye color), curled (cu=upcurved wings), fluted (fl-creased wings) fruit fly is crossed to a pure-breeding wild-type fly. The F1 females are testcrossed with the following results.
describe how the cell reflects emergent properties not seen in lower levels of the biological hierarchy and include a definition of emergent properties.
Describe the Earth's nitrogen cycle with emphasis on those reactions performed exclusively by prokaryotic cell metabolisms.
Explain how the cell regulates the transition from G1 phase to S phase. Describe the functions of the major regulatory proteins (which can include tumor suppressors).
Mating between black rats of identical genotype produced offspring as follows: 14 cream colored, 47 black, and nineteen albino.
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