The stems and fruits of pineapple plants contain a group of protein-diresting enzymes collectively melain and often used as an anti-browninp agent for frujte and ds an anti-browning agent for fruits and vegetables, Fruits and bles brown when they are bruised during transport or sliced and exposed to air. This browning is olled by enzymatic pathways that produce brown pigments. The browning of fruits and stables reduces the nutritional value of the food, so anti-browning agents such as bromelain are controlled by enzi used.

(a) Identify the type of monomer of which this enzyme is composed.
(b) Bromelain works by breaking the enzymes that cause browning into smaller molecules. Explain how the reaction that breaks up the enzymes occurs.

a. Bromelain comprises various subunits of proteolytic enzymes, that is, sulfhydryl proteases.  

b. Bromelain performs the role of dissociating the enzymes into simpler molecules. Bromelain refers to a proteolytic enzyme that performs the role of dissociating the enzymes that are deleterious by the activity of a free sulfhydryl group present on the cysteine side chain. The dissociation of the enzymes is done by hydrolyzing the peptide linkage.

A nucleophilic residue produced by the cysteine acts on the enzyme and gives rise to a covalent complex. After this hydrolyzation of the complex is done by water, which eventually dissociates the peptide linkage of the deleterious enzyme. Due to the dissociation of the peptide bond, the enzyme finally gets dissociated into smaller molecules, and recovery of bromelain is done.  

a fossil fuel is a fuel formed by natural processes, such as anaerobic decomposition of buried dead organisms, containing energy originating in ancient photosynthesis.[1] the age of the organisms and their resulting fossil fuels is typically millions of years, and sometimes exceeds 650 million years.[2] fossil fuels contain high percentages of carbon and include petroleum, coal, and natural gas.[3] other commonly used derivatives include kerosene and propane. fossil fuels range from volatile materials with low carbon to hydrogen ratios like methane, to liquids like petroleum, to nonvolatile materials composed of almost pure carbon, like anthracite coal. methane can be found in hydrocarbon fields either alone, associated with oil, or in the form of methane clathrates.

the theory that fossil fuels formed from the fossilized remains of dead plants by exposure to heat and pressure in the earth's crust over millions of years was first introduced by andreas libavius "in his 1597 alchemia [alchymia]" and later by mikhail lomonosov "as early as 1757 and certainly by 1763".[4] the first use of the term "fossil fuel" was by the german chemist caspar neumann, in english translation in 1759.[5]

in 2017 the world's primary energy sources consisted of petroleum (34%), coal (28%), natural gas (23%), amounting to an 85% share for fossil fuels in primary energy consumption in the world.[6] non-fossil sources in 2006 included nuclear (8.5%), hydroelectric (6.3%), and others (geothermal, solar, tidal, wind, wood, waste) amounting to 0.9%.[7] world energy consumption was growing at about 2.3% per year. in 2015 about 18% of worldwide consumption was from renewable sources.[8]

the answer would be..

b. sucking