Question

complete the following paragraph to describe the functions of proteins.

actin
keratin
antibodies
collagen
hormones
enzymes
hemoglobin

proteins serve many diverse functions. some function as
__________ , catalyzing metabolic reactions within cells.

some, such as __________ , function in support and provide structure to ligaments, tendons, and skin.

some, such as __________ , serve to transport molecules such as oxygen within the human body.

some, including __________ , function in defense by preventing pathogens from destroying cells.

some proteins, such as __________ , function as chemical messengers and help regulate cell behavior.

some, such as __________ help with muscle contraction and cell movement.

Explanation:

1. Enzymes are proteins that act as biological catalysts, speeding up metabolic reactions. So the first blank is "enzymes".
2. Collagen is a structural protein that provides support to ligaments, tendons, and skin. So the second blank is "collagen".
3. Hemoglobin is a protein in red blood cells that transports oxygen. So the third blank is "hemoglobin".
4. Antibodies are proteins that help in the immune defense by neutralizing pathogens. So the fourth blank is "antibodies".
5. Hormones are chemical messengers (some are proteins) that regulate cell behavior. So the fifth blank is "hormones".
6. Actin is a protein involved in muscle contraction and cell movement. So the sixth blank is "actin".

Answer:

1. enzymes
2. collagen
3. hemoglobin
4. antibodies
5. hormones
6. actin