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Carbohydrates AS
Carbohydrates - taken from CGP AS level biology revision 2008
Question | Answer |
---|---|
What are carbohydrates made from? | Monosaccharides |
Most carbohydrates are large complex molecules, but what are they composed of? | Long chains of monosaccharides (e.g starch is a large carbohydrate composed of long chains of glucose!) |
What are SINGLE monosaccharides called? | Carbohydrates |
What is GLUCOSE? | Hexose Sugar |
What is HEXOSE sugar? | A monosaccharide with '6' carbon atoms in each molecule |
What two forms of glucose are there? | alpha (α) and beta (β) |
What is the main energy source in animals and plants? | Glucose |
What is good about the structure of Glucose? | It can easily be transported |
Glucose's chemical bond contains..... | Lots of energy |
What are DISACCHARIDES? | Two monosaccharides joined together |
How are monosaccharides joined together? | GLYCOSIDIC bonds in a condensation reaction |
When HYDROGEN on one monosaccharide bonds to a HYDROXYL (OH) group on the other, what happens? | They release a molecule of water |
So what is the reverse of this called? | HYDROLYSIS reaction, where a molecule of water reacts with the glycoside bond, breaking it apart |
What do two monosaccharides joining together form? | Disaccharide |
Two α-glucose molecules joined together by a glycosidic bond form what? | Maltose |
Name two more Disaccharides: ___ose and ___ose? | Lactose and Sucrose |
Name two Monosaccharides: β-__ose + ___ose & α-___ose + ___ose? | β-glucose + galactose, α-glucose + fructose |
What are chains of more than two monosaccharides called? | Polysaccharides |
How are polysaccharides formed? | When more than two monosaccharides join together |
Polysaccharides for in exactly the same way as disaccharides, can you remember how? | A condensation reaction releasing a molecule of water |
What do lots of α-glucose molecules joining together by glycosidic bonds form? | AMYLOSE |