Answer: So you can have unbiased evidence, hypothesis, and claims, instead of falsifiable and biased claims
Explanation:
Answer:
The change in mass of the bag was greater when it contained 20% fructooligosaccharides than when it contained 15% fructooligosaccharides because more water moved into the bag with 20% fructooligosaccharides than with 15% fructooligosaccharides.
Explanation:
Diffusion is the movement of substances from an area of high concentration to an area of comparatively lower concentration. Diffusion is said to be complete when both compartments/regions have equal concentration of the substance. The rate of diffusion increase with increase in concentration gradient, increase in temperature, and decrease in size of the diffusable substance.
In our example, the two compartments are the compartment in the diffusion beg which contains fructooligosaccharides and the compartment in the beaker which contains more water, because water (diffusing substance) moves from the beaker where it is more in concentration to the bag, where it is lesser in concentration. The bag, when it contained 15% fructooligosaccharides had relatively more water before diffusion than the bag when it contained 20% fructooligosaccharides, as a result of this, when diffusion starts, it will take a lesser volume of water to move into the 15% bag to attain equilibrium than it will take for the 20% fructooligosaccharides bag to attain equilibrium. Meaning that more water will move into the bag when it contained 20% fructooligosaccharides than 15% fructooligosaccharides making the overall volume in the bag higher.
Let me use hypothetical values; assume that before diffusion, both (15% and 20%) bags weighed 50 g of the solute (fructooligosaccharides) each, but had different concentration of the solute. Let us also assume that by the time 10g of water moves into the 15% bag, it attained equilibrium, bringing the total weight in the bag to 60g. It will take more than 10g of water to move into the 20% bag before it attains equilibrium, lets say it take 18g of water to move into the 20% bag to cause equilibrium, total weight of the 20% bag becomes (50 + 18 = 68g), hence the mass of the 20% bag will be higher than the 15% bag at equilibrium.
Caffeine and the other xanthines block the brain's receptors for a substance known as Adenosine , which is a neurotransmitter or neuromodulator.
The most popular central nervous system stimulant is caffeine. There are three main ways that caffeine affects the central nervous system that have been identified. Only at high non-physiological caffeine concentrations do intracellular calcium mobilisation and specific phosphodiesterase inhibition take place. The antagonism at the level of adenosine receptors is the only likely mechanism of action of the methylxanthine. Caffeine causes a relative brain hypoperfusion by increasing energy metabolism throughout the brain while simultaneously decreasing cerebral blood flow. Caffeine appears to affect the local release of dopamine by activating noradrenaline neurons. Many of caffeine's arousing effects could be attributed to the methylxanthine's effects on serotonin neurons.
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Answer:
A. 15%
Explanation:
DNA is composed of four nitrogen bases: Adenine (A), Thymine (T), Guanine (G), and Cytosine (C). Chargaff's rule of base pairing states that A always pairs with T, while G always pairs with C. The total distributed percentage of the four 4 nitrogen bases must be equal to 100%. In this case, the C content is 35%, thereby G=35% (i.e., equal to C content), while the remaining 30% must be equally divided between T=15% and A=15%.