B3- Biological molecules | Baamboozle - Baamboozle

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Biology

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#Biology #IGCSE

The polysaccharide cellulose is used to make the criss-crossing fibers from which the plant … … are constructed. They help maintain the shape of the plant cell.

Cell wall

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Test for starch: Add … solution to a sample of food. A …/… color appears if starch is present, if not, it’ll remain …/brown.

1- blue/black 🔵⚫️ 2- orange/brown 🟠🟤

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Fats AKA …

Lipids

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A gram of fat gives …kJ of energy. …kJ/g

39

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Many plants store oil in their seeds- for example, peanut, coconut and castor oil provide a good energy for germination.

🥜🥥🦫

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What is the name of the tests for fats?

emulsion test

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Steps for test for fats: 2-shake chopped food with ethanol to dissolve. 3-pour the ethanol into the water 1-if fat is present in the food the ethanol mixture will break up into millions of tiny droplets of fat(itll look white and opaque ⚪️)

2,3,1 (if present the emulsion will look white and opaque like milk, if no fat is present the solution will remain transparent)

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Protein molecules are made up of long chains joined end-to-end. These smaller molecules are called … …

Amino acids

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There about … different kinds of amino acid.

20

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Is it true that if there is a small difference in the order of the amino acids, a different type of protein is made?

Yes

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Some proteins are soluble in water; an example is …, the red pigment in blood. Others are insoluble in water; for example, … Hair and fingernails are made out of it.

haemoglobin, keratin

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Is it true that some proteins are soluble in water?

True (haemoglobin and keratin)

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Many of the proteins in the food you eat are used for? And why are they needed?

Proteins are used to make new cells. These new cells are needed for growing and repairing damaged parts of the body.

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What parts of the cell contain a lot of protein?

cell membranes and the cytoplasm (especially)

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True of false? The shape of the protein affects its function?

True (amino acids from which it is made up of can curl up into different shapes)

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What is the test for protein called?

Biuret test

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