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Biological molecules exam questions and answers
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Biological molecules exam questionsand answers
Name a type of reaction that would break down carbohydrates into their monomers -
Answer-Hydrolysis
Give one feature of starch and explain how this feature enables it to act as a storage
substance - Answer-Spiral structure makes starch more compact.
Give on feature of glycogen and explain how this enables it to rapidly release glucose
monomers - Answer-Highly branched so more enzymes can act on it and therefore
more is rapidly broken down to form glucose monomers to be used in respiration as
animals have a higher metabolic rate.
What polysaccharides are found in plant cells - Answer-Starch and cellulose
What polysaccharides contain glycosidic bonds - Answer-Starch, cellulose and
glycogen.
What polysaccharides contain beta glucose monomers - Answer-Cellulose
Explain one way which the structure of cellulose is linked to its function - Answer-
Cellulose has alternating Unbranched monomers which form rows that are joined
together by hydrogen bonds that form cross links between parallel chains. Many
hydrogen bonds create a strong structure.
Name the type of reaction that converts cellulose to its monomers - Answer-Hydrolysis
Cotton is a plant fibre used to make cloth. Explain how cellulose gives cotton it's
strength - Answer-Cellulose is made up of alternating Unbranched chains of beta
glucose monomers forming rows. These rows are bonded by weak hydrogen bonds that
form cross linkages. These cellulose molecules group together to form micro fibrils
Explain which hydrogen bonds are important in cellulose - Answer-They form cross
linkages between cellulose chains to create an overall strong structure.
Some seeds contain lipids. Describe how you could use the emulsion test to show a
seed contains lipids - Answer-Add seeds to ethanol and distilled water which form a
white emulsion which represents the presence of starch.
A triglyceride molecule is formed by condensation. From how many molecules is this
triglyceride formed - Answer-4
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