Biological Molecules - AQA A Level Biology

Which ion is positively charged in the formation of sodium chloride?

• Na+

• Cl-

• H+

• O2-

What is true about ionic bonds compared to covalent bonds?

• Ionic bonds are stronger

• Ionic bonds are weaker

• Ionic bonds are the same strength

• Ionic bonds do not exist.

Which process is associated with the release of water?

• Hydrolysis

• Condensation

• Photosynthesis

• Respiration

What happens to the polymer chain in a hydrolysis reaction?

• It becomes longer

• It becomes shorter

• It remains the same

• It forms a new bond.

In the reaction shown, what is the product when two glucose molecules combine?

• Maltose

• Sucrose

• Lactose

• Fructose

In the alpha glucose structure, where is the hydrogen atom located?

• Above

• Below

• Left

• Right

Lactose is formed from which two monosaccharides?

• Glucose and Fructose

• Glucose and Galactose

• Fructose and Galactose

• Glucose and Glucose

What color indicates a large amount of reducing sugar in the Benedict's test?

• Blue

• Green

• Orange

• Brick-red

What is the purpose of heating the sample in a water bath during the Benedict's test?

• To dissolve the sugar

• To activate the reagent

• To form a precipitate

• To sterilize the sample.

What is an example of a non-reducing sugar?

• Glucose

• Fructose

• Sucrose

• Lactose