-The Cell Is the Basic Unit of Life

question 144

Multiple Choice

-The cell is the basic unit of life. All cellular structures exhibit special functions. Match the structure with its function. What is the function of "A"?

• A) directs cellular activities, contains DNA
• B) contains digestive enzymes
• C) outer boundary of cell, controls entry and exit of substances
• D) major site of ATP synthesis when oxygen is available
• E) site of protein synthesis

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Definitions:

Epigenetic Mechanisms

Biological processes that alter gene expression without changing the DNA sequence, influencing organism development and behavior.

Gene Expression

Gene expression is the process by which information from a gene is used to synthesize a functional gene product, often a protein, which can affect the characteristics of a cell or an organism.

Histone Modification

Chemical modifications to the histone proteins around which DNA is wrapped, influencing gene expression without altering the DNA sequence itself.

Ependymal Cells

Glial cells lining the ventricles of the brain and the central canal of the spinal cord, involved in the production and circulation of cerebrospinal fluid.