3.4 Proteins

What is a peptide bond?

• Bond that holds two amino acids together.
• A bond that holds hydrogen and oxygen molecules together.
• A bond that holds the phosphate group of one nucleotide and a sugar of a neighboring nucleotide.
• A bond that is formed by the sharing of electrons.

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How many different amino acids are there?

• 15
• 20
• 25
• 30

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Enyzmes are a very important type of protein used to

• Build bones in skeleton
• Send hormonal signals throughout body
• Speed up chemical reactions
• Photosynthesize glucose in plants

This is one job proteins do NOT have in the body

• storing genetic information
• structure
• speed up chemical reactions
• transport things through cell membrane

What is the monomer of proteins?

• amino acids
• polypeptides
• nucleotides
• monosaccharides

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Which macromolecule is this?

• carbohydrate
• lipid
• protein
• nucleic acid

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What is a protein: 

• A polymer composed of many sugars.
• A polymer composed of many amino acids. 
• A polymer composed of fatty acids. 
• A polymer composed of nucleotides. 

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Bond formed between two amino acids that results in a water molecule being released

• peptide bond
• complete protein
• dipeptide
• casein

Amino acids that must be supplied by foods in the diet

• essential amino acid
• complete protein
• emulsion
• collagen

_ is/are used to build and repair muscle.

• carbohydrates
• fiber
• protein
• fat

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