Proteins and Enzymes Worksheet

Which of the following statements is true about proteins and enzymes?

• All proteins are enzymes.

• All enzymes are proteins but not all proteins are enzymes.

• No enzymes are proteins.

• Proteins and enzymes are completely unrelated.

What is the primary building block of proteins?

• Nucleic acids

• Fatty acids

• Amino acid units

• Monosaccharides

Which type of protein is responsible for carrying substances in the blood or lymph?

• Structural proteins

• Transport proteins

• Contractile proteins

• Hormones

Which of the following is an example of a structural protein?

• Hemoglobin

• Actin

• Insulin

• Immunoglobulins

What is the function of immunoglobulins in the body?

• Affect muscle contraction

• Protect the body from foreign pathogens

• Coordinate body systems' activities

• Provide nourishment in early embryo development

How do digestive enzymes assist in the body?

• Construct different structures

• Help break down food by catabolizing nutrients into monomeric units

• Affect muscle contraction

• Provide nourishment in seedlings

Which protein type is involved in muscle contraction?

• Storage proteins

• Contractile proteins

• Hormones

• Defense proteins

Explain why not all proteins are enzymes, using examples from the table.

• Because only storage proteins are enzymes.

• Because proteins have many functions, such as transport (hemoglobin), structure (keratin), and defense (immunoglobulins), not just catalysis.

• Because all proteins are only involved in digestion.

• Because enzymes are not made of amino acids.

Which of the following statements best describes when polypeptides/proteins become functional?

• When they are synthesized as a linear chain of amino acids

• When they fold into a 3-dimensional shape

• When they are translated from mRNA

• When they are transported out of the cell

How many levels of folding structure do proteins have?

• Two

• Three

• Four

• Five