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Function :
They bind tightly to unfamiliar things in the blood i order to help stop infection or mark the object for other systems to find and fight off

Specific example:
the most common is IgG, it protects against bacterial and viral infections
Globular or fibrous?
Globular, they need to react.

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Description of function:
Enzymes are proteins that increase our bodies' chemical processes, or metabolism. Some compounds are created, while others are broken down. Enzymes are a part of all living things. Enzymes are created by our bodies naturally.

Example
Rubisco is found in plant cells and fixes atmospheric carbon dioxide into bioavailable sugar molecules. We need carbon but it's located in highly oxidized forms like carbonate minerals and carbon dioxide gas. Rubisco forms bridges between life and lifeless producing organic carbon from the air's inorganic carbon dioxide.

Globular

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Rhodopsin plays a central and very important role in the way that we see. The molecule sense light and is composed of many small light-sensitive molecules of  retinal. When retinal absorbs a photon, its cis conformation switched to a trans conformation. The surrounding opsin protein captures and detects this switch and transmits the signal all the way to the brain through g-protein signalling networks and nerve signals.

Our retinal cells are made up of many Rhodopsin which makes them highly sensitive to light and allows them to detect light efficiently and direct it to the brain.

Once the retinal cells are changed to their trans conformation, they are no longer useful so the brain has to reset retinal cells after they have been affected by photons and light. This is challenging when they are buried deep inside opsin. So, the used retinal is removed from the opsin and moved to other cells where they are reconverted into their cis form so that they can be light sensitive again.

Rhodopsin is globular.

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Contraction:
In this case contraction is talking about the shortening and elongation of muscles which happens when muscles are undergoing myosis.

Myosis:
Myosis means the act of molecular motion. All movement in your body is powered by myosin. Myosin is a molecular sized muscle that uses chemical energy to form a movement or motion. Myosin captures ATP and uses it to perform movements. The more your muscles move, the more ATP is required for myosin. Fingers typing on a key board are a good example of myosis.

Myosin is a fibrous protein.

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What is the function of Hormone proteins?
- Hormone proteins help control the level of glucose in the blood. They transmit signals to coordinate biological processes between different cells, tissues, and organs. Hormone proteins provide structure and support for cells, (in other words: they allow the body to move.)

Specific example of a hormone protein:
A specific example of a hormone protein is Insulin. Insulin proteins move quickly through the blood and is easily captured by receptors on cell surfaces, delivering its message.

Are hormone proteins globular or Fibrous?
Hormone proteins are globular

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- Makes structures
- Made to be very strong

Collagen
- 1/4 of all body protein
- Strengthen tendons
- Support skin/organs
- Make bones and teeth
- Composed of a triple helix structure
- Needs vitamin C to stay strong
- Makes up gelatin in the grocery store

Spider silk
- Tough and stronger than steel (by weight)
- Uses
- Wrapping prey
- Making webs
- Parachuting (young spiders floating to new areas)
- Shelter building
- Egg sacs
- Mating uses

All are fibrous proteins so as to not dissolve in water.

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What is the function of transport proteins?
Transport proteins are proteins that are used to transport ions and/or molecules around the body. Transport proteins can be found in several places in the body. Examples include in the blood, such as hemoglobin, or in plasma membranes, to allow the transport of proteins through the membrane. Transport proteins are able to transport ions or molecules because the molecules can bind to the protein.

Specific example: Hemoglobin?
Hemoglobin is the protein that makes blood red. It also carries oxygen, which binds to the heme group. It is composed of four protein chains: two alpha chains and two beta chains. Each have a ring-like heme group containing an iron atom. Oxygen binds to these iron atoms and can therefore be transported by the blood.

What category is it in? Globular or fibrous?
Hemoglobin is globular. This is because it is a quaternary structure composed of two alpha chains (with 141 amino acids) and two beta chains (146 animo acids). This structure allows the proteins to be soluble in water, meaning the protein can travel around the body through the blood stream, such is the case with hemoglobin.