Biology, 26.02.2020 02:01 mariaveliz2201

The process of protein folding involves: Select one: a. formation of a number of final structures simultaneously, with the incorrect structures removed by proteolysis. b. a progressive random search through multiple distinct complete conformations that eventually results in the native protein. c. a rapid "collapse'" of the extended polypeptide chain into the fully folded native conformation. d. progressive stabilization of correct secondary structural intermediates, and unfolding of incorrect structures, until the final structure is attained. e. an increase in free energy until the proper final structure is reached

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The correct answer is: d. progressive stabilisation of correct secondary structural intermediates, and unfolding of incorrect structures, until the final structure is attained.

Explanation:

Protein folding is a sequential process and not a random one.It is necessary that a protein must fold in such a way that in the end it is able to attain the particular conformation which is required for its function.The folding of an amino acid sequence is a process that is thermodynamically favourable. This is because in a folded protein the hydrophobic amino acids escapes from interacting with water molecules and hence gets stabilised.A folded protein has lower energy and is more stable than a linear polypeptide chain.The folding of an amino acid linear chain into a protein takes place in the following way:The folding of the amino acid sequence begins during the process of translation of the mRNA (messenger Ribonucleic Acid) by Ribosome. (Co-translational folding)This is because initially the linear amino acid sequence forms a secondary structure (alpha helix, beta sheet) which is formed between the nearby amino acid residues.These structures form progressively and sequentially and each structure after formation is checked for its correct conformation before the next structure (tertiary structure) is formed.If an incorrect folding has occurred, the folded polypeptide chain opens up and refolds until correct orientation is attained.Folding, opening and refolding process continues until the correct conformation of the protein is attained.

Answer from: Quest

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Answer from: Quest

question#1

ans:

cell is the basic unit of organization of all living things. cells are often called the building block of life and it is the smallest unit of life. the study of cell is called cell biology. cell consists of cytoplasm enclosed within membrane, which contain bio-molecules such as proteins and nucleic acid.

two third of cell is water, which means that two-third of your whole body is water. the rest is the mixture of molecules, mainly proteins, lipids and carbohydrates.

question#2

ans:

organ:

an organ is a group of tissues specialized to form a functional unit. an example is the heart in animals.

organ system:

an organ system is a group of several organs whose functions are synchronized to release an effective action in a living organism. an example is digestive system.

question#3

different systems perform different function at tissue level. for example, the respiratory system facilitates breathing. in the alveoli tissue of the lungs, the exchange of oxygen and carbon dioxide molecules between the air and the bloodstream occurs by passive transport, so that oxygen is taken in and carbon dioxide and water are removed. different systems of the body carry out different functions. for example, your digestive system is responsible for taking in and processing food, while your respiratory system working with your circulatory system is responsible for taking up oxygen and getting rid of carbon dioxide.

question#4

different systems perform different function at tissue level. for example, the respiratory system facilitates breathing. in the alveoli tissue of the lungs, the exchange of oxygen and carbon dioxide molecules between the air and the bloodstream occurs by passive transport, so that oxygen is taken in and carbon dioxide and water are removed. different systems of the body carry out different functions. for example, your digestive system is responsible for taking in and processing food, while your respiratory system—working with your circulatory system is responsible for taking up oxygen and getting rid of carbon dioxide.

question#5

our body works because of the interactions that happen between organs and organ systems.

for example:

the heart to regulate blood flow throughout the body. the blood carries oxygen and nutrients to the cells and carries carbon dioxide and waste away from the cells. body systems work together in maintaining a constant internal environment. when this balance is disrupted, the body systems may not function properly, and human health can suffer. you start to feel bad.