Water and Carbohydrates Mid-Term

One oef the roles of water in living organisms is that it acts as a transport medium in blood.

Which of the following properties of water accounts for this role?

• High specific heat capacity

• Strong cohesive forces between molecules

• hHigh heat of vaporisation

• Solvent for polar molecules nad ions

Which of the following bonds between the molecule enables water to exist as a liquid rather than a gas at normal room temperature?

• Covalent

• Hydrogen

• Ionic

• Hydrophilic

Which molecule does this structure represent?

• Cellobiose

• Maltose

• Lactose

• Sucrose

Collagen consists of polypeptide strands held togeteher by H-bonds and CO groups. Which of the following terms BEST describes the structure of collagen?

• A triple helix

• An alpha helix

• A double helix

• A beta-Helix

Which of the following correctly names the type of bond represented by the broken lines (---) in the diagram above?

• Ionic bond

• Hydrogen bond

• Hydrophobic bond

• Disulphide bond

Which of the following indicates the form of glucose and the molecule in which it is present?

• Alpha....Cellulose

• Alpha....Starch

• Beta....Cellulose

• Beta....Starch

Triglycerides are excellent sources of energy for the body because of their

I. Large size

II. Ability to insulate

III. Large number of C-C bonds

IV. Insolubility in water

• A. I and III

• I and IV

• II and III

• II and IV

During hydrolysis of the protein structure shown above, which of the following bonding interactions is broken?

• Double

• Peptide

• Hydrogen

• Hydrophobic

Which of the following is not a polymer?

• Starch

• Cellulose

• Glucose

• Glycogen

Sucrose is a good transport molecule as seen in phloem tissue becasue it is a

• Dissachride made up of two glucose molecules

• Dissacride made up of glucose and galactose

• Very reactive molecule chemically and therefore combines easily with water

• Very soluble molecule and can therefore be moved efficiently in high concentrations