Science (Biology). Revision for Mid year Examination. Topics. Biological Molecules (Nutrients) Enzymes Nutrition in Man Nutrition in Plants. Biological Molecules (Nutrients). What are the components of the nutrients we need? Carbohydrate Fats Protein. Biological Molecules (Nutrients).
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Revision for Mid year Examination
What are enzymes?
Enzymes are biological catalysts that speed up the rate of reactionwithout themselves being chemically changed at the end of the reaction.
Describe the effects of temperature on enzyme action.
Describe the effects of pH on enzyme action.
Explain the effects of temperature on enzyme action.
Describe / Explain how enzymes work.
- Enzymes can then be reused.
Describe / Explain the role of bile in digestion
(i) the pancreas
(ii) the liver
Describe what happens to fats as they pass through the following regions of the alimentary canal:
the mouth cavity
no fat digestion occurs in the mouth due to absence of lipase
(ii) the duodenum
Describe / Explain how the small intestine is adapted to carry out absorption of nutrients
The small intestine is adapted for absorption in three ways:
secondly, its wall bears numerous villi
villi are minute finger-like projections that increases the surface area for absorption
thirdly, the small intestine is long and coiled to provide sufficient time for absorption