The Ultimate Protein Quiz. AS Biology OCR.

The monomers of proteins are...?

Amino acids

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Two amino acids joined together form a....

Dipeptide

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Several amino acids joined in a chain is a ....?

Polypeptide

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How many different amino acids are there?

20

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What is the most simplest form of the R-group?

H

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What kind of reaction produces the peptide bond?

Condensation reaction

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What is the primary structure of a protein?

The primary structure of a protein is given by the specific sequence of amino acids that make up the protein.

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Enzymes that catalyze the breaking of peptide bonds are know as ______________.

Protease enzymes

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What is the secondary structure?

The secondary structure is formed when the chain of amino acid coils or folds to form an alpha helix or a beta pleated sheet. Hydrogen bonds hold the coils in place.

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What is the tertiary structure?

The tertiary structure is the final three dimensional shape of a protein is formed when these coils and pleats themselves coil or fold. This 3D shape is held in place by a number of different types of bonds and interactions.

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Heating a protein increases the kinetic.This causes the molecule to vibrate,most bonds are quite weak so easily broken. Whole tertiary structure can unravel and protein will no longer function. This is called?

Denaturation

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Fibrous proteins usually have structural roles while Globular usually have...

Metabolic roles

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An example of a globular protein is ...?

Enzymes found in all organisms. Plasma proteins and antibodies found in the blood of mammals.

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An example of a fibrous protein is?

Collagen found in bone and cartilage. Keratin found in fingernails and hair.

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Tertiary structure in proteins is stabilised by a number of bonds such as...?

Disulfide bonds, Ionic bonds, Hydrogen bonds, Hydrophobic and hydrophilic interactions.

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What is the quaternary structure?

Quaternary structure refers to the fact that some proteins are made up of more than one polypeptide subunit joined together, or polypeptide and an inorganic component.

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Examples of proteins with quaternary structure include....

Insulin and Haemoglobin

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Haemoglobin's quaternary structure consists of four polypeptide subunits. Two are called _______ and the other two are ________. The four subunits together form one haemoglobin molecule, which is a water soluble globular protein.

Alpha chains, beta chains

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Haemoglobin's function is to carry oxygen from the lungs to the ____. It binds oxygen in the lungs and releases it in the tissues. A specialised part of each polypeptide, called a _______ is responsible for the ____ of haemoglobin

tissues, haem group,colour

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One complete haemoglobin molecule can bind to up to ______ oxygen molecules.

Four

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The haem group is NOT made of amino acids. It is called a __________?

Prosthetic group

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Collagen is a _________ protein.

Fibrous

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A collagen molecule is made up of ________ polypeptide chains.

Three

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_______________bonds form between the chains, which gives the structure strength.

Hydrogen

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The strength of the molecule is increased further because each collagen molecule forms __________called cross-links with other collagen molecules next to it.

Covalent bonds

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What is the function of collagen?

Mechanical strength in many areas

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The Ultimate Protein Quiz. AS Biology OCR.

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