Levene proposed the polynucleic model, stating that DNA and DNA were composed of nucleotides.
Answer: In all living systems we can always find 4 basic elements: carbon, oxygen, nitrogen and hydrogen. Carbon is the basic building unit contained in living matter. The percentage of carbon in the mass of living matter is 19.4 %. Oxygen and hydrogen are present in almost all organic compounds which create living organisms.
Explanation:
Answer:
a) (SO4)2 + Ba2 = BaSO4
b) (CO3)2 + 2H = H2O + CO2
c) NH4 + 2Na = Na + 2N + 2H
There u go :D
Answer:
when the salt outside of the paramecium is higher that the amount of salt inside a paramecium ,then they need all of the water they can get as a result they do not need contractile vacuole to contract.
ribosomes make protein which is found in cytosol.
lipids are present in the outer layer of the cell.
