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(a) The total concentration of dissolved inorganic carbon in a sample of sedimentary pore water is 5.576 mmol/kg. Isotopic analysis of this DIC yields a δ13C = -37‰ vs. PDB. It’s known that the pore water initially contained some CH4 with δ13C = -84‰ vs. PDB, that the CH4 has been converted quantitatively to CO2, that pore waters in which no CH4 was oxidized have δ13C = -12‰ vs. PDB, and that the pore water in question has neither lost nor gained DIC except by the oxidation of CH4. What were the initial concentrations of dissolved inorganic carbon and CH4 in the pore water?
can a stem cell become a nerve cell
Explain the relationship between natural selection and evolutionary change
can stem cells develop into gametes
Role of gene flow in evolution
Cavities of optical lobe is
water molecules are_ meaning that they stick to other water molecules. this property allows for water to flow freely
In 1882, Theodor Engelmann performed an important experiment in regards to photosynthetic activity.
What Engelmann did was to place oxygen seeking bacteria and algae (single celled photosynthetic organisms) on a microscope slide. He illuminated the slide through a glass prism. The prism splits white light into the various wavelengths of light so that each section of the slide was receiving a different wavelength/color of light. At the end of the experiment, he observed the following under a microscope, as demonstrated in the figure below.
a. What was Engelmann’s hypothesis about photosynthesis that formed the basis of the above experiment?
b. What are the various observations from the above experiment (based on the figure)?
c. What could be the possible conclusions from the above experiment?
d. What possible additional experiments would you suggest to exclude the possibility that the bacteria are attracted to the blue and red lights?
Fully explain how a polymorphism of a human heterozygote can be fitter than any of the two homozygotes of the particular characteristics, by referring to sickle cell anaemia
Cholesterol is found in many foods and can also be made by the liver through a series of enzyme-catalysed reactions. To avoid increased risks of heart disease, cholesterol levels must be tightly regulated. In healthy individuals, cholesterol is only produced by the liver when blood cholesterol levels are low. In certain individuals, the body fails to regulate cholesterol production because of a mutation in one of the enzymes involved in the biochemical pathway responsible for synthesizing cholesterol, resulting in an overproduction of cholesterol. Explain a mechanism for how this mutation might result in excess cholesterol production.
#339914 on Dec 2023