Meiosis is important in the human life cycle in terms of chromosome number because it maintains the chromosome number in human beings constant. Meiosis occurs when gametes are produced wherein only half the number of the total chromosomes are allotted for each gamete.
Enzymes are proteins, and proteins are basically a large chain of amino acids (polymer). So imagine when the chain is clumped into a 3D thing (see picture), it is slightly elastic (since there are spaces) and can have a bit of movement for the substrate to fit in. However, the shape is specific as it will return back to its original position once the substrate has left. Just imagine a silicone cup, when you stretch it a bit to fit a slightly larger ball in, it expands a little. When u remove the ball, it returns to its original shape. Similarly, the enzyme active site will return to its original shape but can be slightly molded for a short while, and that is what the sentence meant. It’s quite hard to explain without an actual model/ video, so if you don’t understand you can comment below!
Mistletoe (phoradendron spp.) infest many taxa of plants, often causing the branches of the host species to become swollen and distorted and making the trees more susceptible to insect infestations. this is an example of <span>parasitism.
Parasitism is the relationship between two species of plants or animals within which one advantages at the expense of the opposite, typically while not killing the host organism.
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D. Natural gas. It has similar properties to fossil fuel/oil but is mainly methane.