Computer Applications & Bioinformatics

Analysis of word processing and GUI operations:

• Incorrect: Clip art refers to pre-made graphic images and illustrations that can be inserted into documents.
• Correct: In graphical user interfaces and word processing software, dragging the mouse cursor across characters shades the text background to select or mark it, an action commonly described as highlighting (or text selection).
• Incorrect: 'Fetch' is a CPU machine cycle operation retrieving instructions from memory.
• Incorrect: 'Decode' is a CPU operation interpreting binary machine instructions.

Analysis of common computer file extensions:

• Incorrect: Compressed archives typically use extensions like .ZIP, .RAR, .7Z, or .TAR.GZ.
• Correct: The .BAT file extension stands for a 'batch file', which is a plain text executable system script containing a series of sequential commands interpreted and executed line-by-line by the command-line interpreter (cmd.exe / COMMAND.COM) in DOS and Microsoft Windows operating systems.
• Incorrect: Common audio file formats include .MP3, .WAV, and .AAC.
• Incorrect: Backup files typically carry extensions like .BAK or .BKF.

Memory representation of floating-point numbers:

• $4$ is the memory size in bytes, not bits ($1\text{ byte} = 8\text{ bits}$).
• $7$ is approximately the number of decimal digits of precision.
• standard IEEE-754 single-precision floating point number (REAL*4) occupies exactly $4\text{ bytes} = 4 \times 8 = 32\text{ bits}$ (comprising $1$ sign bit, $8$ exponent bits, and $23$ mantissa bits).
• $22$ is incorrect.