Biochemistry

In red blood cells, a protein called ________ binds to oxygen.

• hemoglobin
• ATP
• RNA
• DNA

The building blocks of nucleic acids are called ...

• amino acids
• nucleotides
• carbohydrates
• proteins

ATP is...

• a unit of energy in the cell
• a type of lipid
• a molecule of DNA

Phospholipids have a _________ head and a __________ tail.

• hydrophilic, hydrophobic
• hydrophobic, hydrophilic 

Hydrophilic technically means...

• water-hating
• water-loving

Enzymes are _________ that __________ chemical reactions.

• proteins, slow down
• proteins, speed up
• lipids, slow down
• lipids, speed up

RNA is an example of a ...

• nucleic acid
• phosphate group
• protein
• carbohydrate

The cell membrane is formed mostly by...

• carbohydrates
• proteins
• phospholipids
• nucleic acids

Nucleotides are made up of three parts. The three parts are...

• DNA, RNA, and a sugar
• a lipid, a fat, and an oil
• a carbohydrate, a protein, and a fat
• a sugar, a phosphate, and a base

Regulatory substances that are in an organism are called...

• enzymes
• hormones