3.1 Biological Elements

Question 1

What elements are present in carbohydrates?

Answer 1

Carbon, Hydrogen Oxygen

Question 2

What elements are present in lipids?

Answer 2

Carbon, Hydrogen, Oxygen

Question 3

What elements are present in protein?

Answer 3

Carbon, Hydrogen, Oxygen, Nitrogen

+ sulfur (sometimes)

Question 4

What elements are present in Nucleic acids?

Answer 4

Carbon, Hydrogen, Oxygen, Nitrogen, Phosphorus

Question 5

What is the difference between molecules and compounds?

Answer 5

Molecules - contain more than one atom and can be either elements (O2
, N2) or compounds which comprise of more than one molecule (C6H12O6)

Compounds - contain either ionic bonds between elements (NaCl) or covalent bonds (C6H12O6). Ionic compounds are NOT molecules