Biology STAAR Biomolecules

Four different nucleotides are used as building blocks of DNA.  Which of the following can be used to distinguish one nucleotide from another?

• The nitrogenous base
• The shape of the deoxyribose
• The length of the phosphate group
• The type of fatty acid

The complex carbohydrates pictured are made by linking molecules of glucose. The carbohydrates have different structures because-

• they contain different chemical elements
• they form different proteins
• they carry different nucleotides
• they perform different functions

The difference between two molecules is the type of sugar that forms and the identity of nitrogenous bases. These molecules are-

• proteins
• lipids
• nucleic acids
• complex carbohydrates

In the picture, which represents a fatty acid?

• F
• G
• H
• J

Which of the following biomolecules typically contains nitrogen and phosphate?

• lipid
• protein
• nucleic acid
• carbohydrate

Carbohydrates are more easily metabolized than lipids. However, on a gram-for-gram basis lipids provide cells with more-

• nitrogen
• proteins
• structure
• energy