Biology - Biological Molecules

Which is not a characteristic of a biological molecule?

• It cannot be formed artificially

• It forms part of various structures of the cell

• It has a carbon skeleton to which other groups are attached

• It stores energy for the cell

Most polysaccharides are composed of chains of condensed…

• Cellulose units

• Fructose units

• Glucose units

• Sucrose units

How many fatty acid molecules are normally present in a fat or oil molecule?

• 1

• 2

• 3

• 4

Which combination of chemical elements is present in a carbohydrate molecule?

• Carbon, hydrogen, oxygen

• Potassium, carbon, hydrogen

• Oxygen, hydrogen

• Carbon, nitrogen, oxygen

Organic molecules are those that contain at least…

• Carbon

• Carbon and hydrogen

• Carbon and oxygen

• Carbon, hydrogen and oxygen

Which carbohydrate is found in the cell walls of plants?

• Chitin

• Cellulose

• Glycogen

• Starch

If an animal needed to store energy for long term use, but not be encumbered with the weight of extra tissue, which is the best molecule for storage?

• Complex cellulose molecules

• Fat molecules

• Fructose and glucose

• Glycogen

Fats are __________ _________ that prevent excessive heat loss

(a)  

Which statement(s) make(s) water suitable to use in a blood transport system?

1. 1. Water cools a surface from which it evaporates

2. 2. Water is used as a solvent for many chemicals

3. 3. Water is involved in many metabolic reactions

• 1 and 2 only

• 1 and 3 only

• 2 only

• 3 only

1. 1. Water provides _____ in young plants.

2. 2. Water _____ salts and sugars.

3. 3. Water allows _____ to occur.

4. 4. Water helps in cooling through ____.

(a)