Cholesterol is a component of cell membranes and is an example of steroid
Enzymes split the DNA molecule into two rails and then transport corrisponding nitrogen bases to each rail.
Answer: a. Excesses are eliminated from the kidneys.
Explanation:
A fat-soluble vitamin can be dissolved in fats and oils. They are absorbed along with fats in the diet from the intestinal lumen using the same mechanisms used for absorption of lipids. Upon absorption, <u>these vitamins enter the lymph vessels</u> before making they go into the bloodstream. In most cases, fat-soluble vitamins must be coupled with a protein in order to be transported through the organism. <u>This means they are solubilized and transported by carrier proteins </u>to exert their actions.
By last, since fat-soluble vitamins can not be dissolved in water,<u> they are not readily excreted. So they can accumulate in fatty tissues</u> to toxic levels if taken in excess.
Answer:
1) Use of aerosol sprays containing CFCS----Increase in greenhouse gases and causes Ozone depletion.
2) Use of extinguishers------ in the Combustion of fossil fuels.
3) Use of carbon tetrachloride as an
industrial solvent-----Agricultural activities
Explanation:
Aerosol sprays containing CFCS which is a harmful substance causes depletion of ozone layer which protects us from harmful radiation of the sun.
Carbon tetrachloride is used in agriculture activities such as a fumigant in the storage house for preventing the grains from pest attack.
Extinguishers are used for controlling the Combustion of fossil fuels.
3rd one .. hope this helped :)
