Exploring the Structure and Functions of Proteins

What are some of the primary functions of proteins in cells?

• DNA replication and molecule transportation

• Photosynthesis and respiration

• Cell division and growth

• Energy storage and release

What elements are found in all proteins?

• Carbon, oxygen, hydrogen, and phosphorus

• Carbon, oxygen, hydrogen, and sulfur

• Carbon, oxygen, hydrogen, and calcium

• Carbon, oxygen, hydrogen, and nitrogen

What distinguishes different amino acids from each other?

• The number of peptide bonds

• The type of R-group attached

• The length of the polypeptide chain

• The presence of nitrogen

What is the simplest amino acid?

• Arginine

• Histidine

• Lysine

• Glycine

What type of bond connects amino acids in a protein?

• Peptide bond

• Covalent bond

• Hydrogen bond

• Ionic bond

Where is the information to construct the amino acid sequence found?

• RNA molecule

• Protein molecule

• DNA molecule

• Lipid molecule

What determines the secondary structure of a protein?

• The number of amino acids

• Hydrogen bonding

• The type of R-group

• The sequence of nucleotides

What can cause the denaturation of proteins?

• Low temperatures

• Neutral pH

• Radiation and chemicals

• Lack of water

Why are most plant proteins considered incomplete?

• They do not use all 20 amino acids

• They are not used in human cells

• They lack carbon

• They are not found in large quantities

Why do vegetarians need to eat a variety of plant materials?

• To ensure proper digestion

• To get enough calories

• To obtain all necessary vitamins

• To get all essential amino acids