The correct answer for this question is (A) Groups of cells form tissues.
In multicellular animals, a group of similar cells alongwith inter-cellular substances perform a specific function. Such an organization is called tissue. All complex animals consist of only four basic type of tissues. These tissues are organized in specific proportion and pattern to form an organ like stomach, lung, heart and kidney. When two or more organs perform a common function by their physical and/or chemical interaction , they together form organ system, eg., digestive system, respiratory system, etc. Cells, tissues, organs and organ system split up the work in a way that exhibits division of labour and contribute to the survival of the body as whole.
Denaturation refers to the loss of protein three-dimensional structure when temperature or pH is altered.
Denaturation is the phenomenon in which the tertiary structure of the protein is broken down due to the breakage of bonds between the amino acids of proteins. This breaking of bonds occurs due to the change in pH or temperature from the normal at which the protein remained active.
Three-dimensional structure of the protein is its form in which the protein remains active and functional. It is generally tertiary structure of protein. This active tertiary structure is decided by the sequence of amino acids in the primary structure of protein, where the protein exists as a linear chain.
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