Select the correct answer from the dropdown list to complete each sentence: An in a DFD represents the source or destination of data, typically external to the system. The process in a context diagram is always assigned the number . When partitioning a DFD, processes done by different user groups are often . An input from an external entity that starts a process is often called a . An table helps in analyzing events and the data produced and consumed by those events.

In DFDs, the acronym CRUD stands for Create, Read, Update, and:

Match each partitioning reason with the best description:

Which are true about event modeling for DFDs?

Which of the following most appropriately describes the Watson and Crick model of DNA?

The two strands that make up a single molecule of DNA are described as being antiparallel to each other.  What does this mean?

What is the significance of the “R” group within an amino acid?

What is the most significant difference between simple diffusion and facilitated diffusion?

What do scientists mean when they say that the cell membrane is selectively permeable?

What types of cells maintain a cell wall?