There are pretty obvious differences between plants and animals, but at the chemical level the cells of all plants and all animals contain DNA in the same shape the famous “double helix” that looks like a twisted ladder.
Molar mass of C is 12.01g/mol.
Molar mass of H is 1.01g/mol.
Molar mass of O is 16.00g/mol.
If we have 19 atoms of C, 38 atoms of H, and 1 atom of O, then we have:
19*12.01+38*1.01+1*16.00=282.57g/mol
282.57g/mol is the molar mass of the pheromone molecule.
Supposing that "<span>1.8 10-12 g" is 1.8*10^(-12)g then, this quantity of pheromones, shoud be divided by the molar mass of the pheromone molecule:
1.8*10^(-12)/282.57g/mol=6.37*10^(-15)moles
Using now Avogadro's number of molecules in 1mol (6.02*10^(23)) it is possible to know how many molecules are there in this pheromone quantity.
</span>6.02*10^(23)/6.37*10^(-15)=9.45*10^(37)molecules
So, in this quantity of the pheromone there are approximately 9.45*10^(37)molecules of it.
Answer:
e. all of the above are important for gel electrophoresis
Explanation:
Gel electrophoresis is the process of separating nucleic acids like DNA on the basis of their molecular size.
DNA is negatively charged due to its phosphate component so it is loaded at the negative pole( cathode ) and it migrates to the positive pole ( anode ). The fragments separate on the basis of their size. Smaller fragments run faster while heavier ones run slower. Hence, it is also important to load a molecular weight standard so that we can find out the size of the sample bands by matching them with the standard bands size.
Ethidium bromide is a dye commonly used to visualize DNA bands. It is mixed with electrophoresis gel making solution. It intercalates within DNA and fluoresces when exposed to UV light so that the DNA bands are visible. Hence, all of these things are important for gel electrophoresis to work.