Edexcel Biology, Unit 1 Topic 1
A water molecule has an unequal distribution of charge. It is therefore described as being...? -
ANS Polar
What is a molecule with the empirical formula CH2O called? - ANS Carbohydrate
Hexose sugar - ANS Mono-saccharide containing six carbon atoms
Mono-saccharide - ANS simplest form of carbohydrate, building blocks of disaccharides and
polysaccharides
Maltose is made up of two of which monosaccharide? - ANS Glucose
Give three results of Hydrogen bonding in water - ANS 1) Higher melting and boiling points 2)
Greater specific heat capacity and latent heat 3) Surface tension and cohesion
Cohesion - ANS Attraction between molecules of the same substance
Sucrose - ANS Glucose + Fructose
Lactose - ANS Glucose + Galactose
What is the full name for the bond between the two mono-saccharides in maltose? - ANS 1,4
Glycosidic bond
Difference between alpha and beta glucose - ANS beta glucose has the hydrogen and hydroxyl
groups on the C1 atom reversed.
Beta glucose is used in which polymer? - ANS Cellulose
Non-reducing sugar - ANS Sucrose
Test for reducing sugars - ANS Benedict's
Adhesion - ANS An attraction between molecules of different substances
Capillary action - ANS Water rising up a narrow tube due to adhesion
Why is water being a good solvent important? - ANS Most biochemical reactions take place in
solution
A water molecule has an unequal distribution of charge. It is therefore described as being...? -
ANS Polar
What is a molecule with the empirical formula CH2O called? - ANS Carbohydrate
Hexose sugar - ANS Mono-saccharide containing six carbon atoms
Mono-saccharide - ANS simplest form of carbohydrate, building blocks of disaccharides and
polysaccharides
Maltose is made up of two of which monosaccharide? - ANS Glucose
Give three results of Hydrogen bonding in water - ANS 1) Higher melting and boiling points 2)
Greater specific heat capacity and latent heat 3) Surface tension and cohesion
Cohesion - ANS Attraction between molecules of the same substance
Sucrose - ANS Glucose + Fructose
Lactose - ANS Glucose + Galactose
What is the full name for the bond between the two mono-saccharides in maltose? - ANS 1,4
Glycosidic bond
Difference between alpha and beta glucose - ANS beta glucose has the hydrogen and hydroxyl
groups on the C1 atom reversed.
Beta glucose is used in which polymer? - ANS Cellulose
Non-reducing sugar - ANS Sucrose
Test for reducing sugars - ANS Benedict's
Adhesion - ANS An attraction between molecules of different substances
Capillary action - ANS Water rising up a narrow tube due to adhesion
Why is water being a good solvent important? - ANS Most biochemical reactions take place in
solution
