Question

Multiple choice: All of the following describe the properties of water except:

A) it is cohesive and therefore, pours easily.

B) it has a high specific heat and so it takes a lot of energy to raise the temperature of water.

C) when water is heated, the heat spreads easily throughout the body of water.

D) it vaporizes at a low temperature, meaning that it only requires a minimal amount of energy to cause a lot of water to evaporate.

Choose the FALSE statement:

A) Carbon, oxygen and nitrogen are common elements in the molecules making up your body because of their ability to form multiple covalent bonds.

B) On the pH scale of 0-14, a pH less than 7 is considered basic and a pH greater than 7 is acidic.

C) If a phospholipid bilayer were placed in a non-polar environment the orientation of the molecules making up this membrane would be the reverse of the water-borne arrangement.

Choose the FALSE statement:

A) Protein molecules are always composed of a single strand or chain of amino acids folded into a random shape.

B) When ATP is hydrolyzed to ADP, the energy released is used to perform work; the products of this hydrolysis will be recycled back to ATP through the digestion of foodstuffs.

C) In the absence of enzymes, the reactions of the cell occur too slowly to support the needs of the cell.

Answer 1

Answer 1. D) it vaporizes at a low temperature, meaning that it only requires a minimal amount of energy to cause a lot of water to evaporate.

This statement is wrong as water has a boiling point of to 100°C are requires considerable amount of energy for evaporation.

The other statements are true as water has high cohesive strength, convection and very high specific heat.

Answer 2. B) On the pH scale of 0-14, a pH less than 7 is considered basic and a pH greater than 7 is acidic.

It's the other way round; pH below 7 is acidic while above it is basic.

The other two statements are simple, correct facts.

Answer 3. A) Protein molecules are always composed of a single strand or chain of amino acids folded into a random shape.

This statement is false because proteins are not randomly folded; there are standard forms of protein folding in the primary, secondary, tertiary and the quaternary structure of the proteins.