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Basics 1. What is an operating system? a) collection of programs that manages hardware resources b) system service provider to the application programs c) interface between the hardware and application programs d) all of the mentioned View Answer Answer: d Explanation: An Operating System acts as an intermediary between user/user applications/application programs and hardware. It is a program that manages hardware resources. It provides services to application programs. 2. To access the services of operating system, the interface is provided by the ___________

What are zymogens? How they are formed? What Is a Zymogen?   A zymogen is like a wrapped candy bar. In order to get to the good stuff, you need to tear away what's keeping you from it.  Zymogens , or  proenzymes , are enzymes that aren't functioning yet because their action is infertile by a 'wrapper'. The 'wrapper' can be a link between two  amino acids  (the building blocks of proteins), like a piece of string keeping a box closed. Or it can be an further section of protein, like a jar lid. How they are formed? When cells make enzymes, especially proteases, they often make them as zymogen, an inactive form of the enzyme. This is so they don't go crazy and are only used when needed. Imagine your reaction if your blender suddenly hopped about on the counter, out of control, spewing half-chopped fruit everywhere. The counter would be a mess, and so would the cell. You can recognize most zymogens by their name. Enzymes that begin with ...