Caseation necrosis refers to an area where: 1) cell proteins have been denatured.2) cell are liquefied by enzymes.3) dead cells form a thick cheesy substance. 4) bacterial invasion has occurred.

The correct answer is 3) dead cells form a thick cheesy substance

Explanation:

Caseation necrosis refers to the necrosis which reflects the occurrence of the cell death where dead cell material shows the crumbly cheese like appearance. It usually occurs in lungs as well as kidneys. Example : tubercular infections. Main reason is caused by syphilis & fungi. When hilar lymph nodes are affected with TB, the appearance is from cheezy tan to white. Thats why this type of necrosis is called mixture of both necrosis( liquefactive&  coagulative necrosis). Eg.Ghon complex in lungs

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.

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