Which of the following database models represent entities as two-dimensional tables, with records as rows, and attributes as columns?
A) relational database model
B) hierarchical database model
C) network database model
D) object-oriented database model
E) semantic database model
Question 2
A ________ key refers to an attribute that appears as a non-primary key attribute in one entity and as a primary key attribute (or part of a primary key) in another entity.
A) primary
B) table
C) foreign
D) super
E) candidate
Some organisms used as models in genetic research
Three-dimensional ultrasonography.
Three-dimensional structures of proteins: Globular protein
Skin structure. Three-dimensional view of the skin, subcutaneous tissue, glands, and hairs
Three-dimensional models of the small and large subunits of ribosomes.
A gene map for chromosome 12 from the NCBI database Map Viewer