In the Relational Database Model

question 50

Multiple Choice

In the relational database model

• A)relationships are explicit
• B)the user perceives that files are linked using pointers
• C)data is represented on two-dimensional tables
• D)data is represented as a tree structure

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Definitions:

Lysosome

Membrane-bound organelles found in nearly all animal cells that use enzymes to break down waste materials and cellular debris.

Ependymal Cells

Glial cells that line the ventricles in the brain and the central canal of the spinal cord, playing a role in producing and circulating cerebrospinal fluid.

Cerebrospinal Fluid

A clear, colorless body fluid found in the brain and spinal cord, providing mechanical protection, nourishment, and waste removal for neural tissues.

Blood-Brain Barrier

A selective permeability barrier that separates the circulating blood from the brain, protecting it from foreign substances.