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Answers
A
1). When a beam of light is passed through a milk solution, then scattering of light is observed. This is known as the Tyndall effect. This scattering of light illuminates the path of the beam in the milk solution.
2). The process of centrifugation is used to separate cream from milk.
3). Usually, a dye is a mixture of two or more colours. The coloured component that is more soluble in water, rises faster and in this way the colours get separated. This process of separation of components of a mixture is known as chromatography.
4). It can be expressed in several ways: molarity (moles of solute per liter of solution); mole fraction, the ratio of the number of moles of solute to the total number of moles of substances present; mass percentage, the ratio of the mass of the solute to the mass of the solution times 100; parts per thousand (ppt), grams.
5). In bacterial cells, ribosomes are synthesized in the cytoplasm through the transcription of multiple ribosome gene operons. In eukaryotes, the process takes place both in the cell cytoplasm and in the nucleolus, which is a region within the cell nucleus.
6). For example, when cell gets damaged, lysosome may burst and the enzymes digest their own cell. Therefore lysosomes are known as the Suicidal bags of a cell or we can say that they posses different kind of hydrolases on release of these enzymes that cause death of cell.
7). The primary cell wall of land plants is composed of the polysaccharides cellulose, hemicelluloses and pectin. Often, other polymers such as lignin, suberin or cutin are anchored to or embedded in plant cell walls.
8). Adenosine Triphosphate (ATP).
B
1). a) Robert Hooke
2). c) colloidal solution
3). d) blue green algae
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