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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).
How do plant and animal cells metabolize energy in complementary ways? What does this suggest about the flow of energy and the recycling of elements through living organisms? Could we think of any other similar relationships.
Cephalochordates and placental mammals both have microlecithal eggs, yet mammalian early development resembles that of birds more than that of amphioxus.
What are the expected frequencies of three phenotypes (bald, red hair, yellow hair) in the male offspring of this cross? Imagine we observe 50 percent bald, 42 percent yellow hair, and 8 percent red hair. What is a recombination fraction between the ..
The main of eukaryotic cells are on the order of 10-100 micrometers in diameter. Bacterial cells are smaller, typically in 1-10 micrometers.
It is commonly reported that up to 50 percent of a cell's energy budget is spent on protein synthesis. Think about the properties of two hypothetical genetic codes constructed with the four common nucleotides.
Explain the three kinds of the mammals based upon how their young grows.Explain briefly the functions of sensory neurons, inter-neurons, and motor neurons in nervous system.
Genes A, B, and C are linked on a chromosome and found in the order A-B-C. Genes A and B recombine with a frequency of 10 percent, and genes B and C recombine at a frequency of 25 percent.
We did a lab for action/absorption spectrum where we covered leaves with different colored plastic. What are the chemical and physical properties and the lytic/latent cycles of animal and plant viruses
What have to be true of the cell wall of this bacterium? Mammalian blood contains an equivalent of 0.15 M. Seawater contains the equal of 0.45 M. What will occur if red blood cells are transferred to seawater.
Describe some of the physiological changes that happen to the cell membranes of a rainbow trout as it acclimatizes to cold, water at 4 degrees Celsius, after living at 16 degrees Celsius for a long time?
The developing fetus has a different kind of hemoglobin than most normal adults. Fetal hemoglobin consists of two chains and two chains, whereas adult hemoglobin consists of two chains and two chains.
Living organisms make and use three main types of ribonucleic acids for their biological functions: ribosomal RNA (rRNA) messenger RNA transfer RNA.
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