100,000 bacteria live on every square centimeter of your skin.

Which of the following is NOT true regarding mitochondria?

HIV attacks T-helper cells. Explain how does that impact the immune system?

There are three parts to this question: 1. Why is the trachea composed of cartilage instead of bone? 2. Why is the trachea composed of cartilage instead of muscle? 2. Why is it not a complete ring of cartilage?

These questions are from the discretionary and mandatory access control modules. All students in a class belong to a group G and are able to access class resources because G is granted the necessary permissions. Assume Alice has tested out of a topic and does not need to take the quiz Q on this topic. The professor does not want Alice to have access to Q but wants Alice to remain in group G so she can access other resources. Also, the professor wants to grant access to Q to all other students by granting the desired access to G. The mechanisms provided by various operating systems can be used to meet this access control requirement. Explain how this can be achieved most efficiently and correctly in Linux with extended access control lists (EACLs) and in Windows. First, provide the access control entries (ACEs) for Alice and G with their types and permissions for the quiz Q in each system. After this, discuss which of these ACEs will be checked if Alice tries to gain access to  the quiz Q. (2+2+2+2  pts.) The Bell and La Padula (BLP) and Biba models address confidentiality and integrity of data in a system that supports mandatory access control. A system allows read-down as is done by BLP, and writes by a user are only allowed at the user’s level (no writes to higher levels are allowed). Does this system satisfy the confidentiality and integrity goals of the BLP and Biba models? First, describe the BLP and Biba requirements and then explain if the requirements of each model are satisfied. (2+2+2+2 pts.) If both models are used simultaneously by a system and object O has the highest sensitivity level (e.g., top secret), what level of integrity should be assigned to O in the Biba model? Is there a drawback to using both of these models at the same time? Provide a brief explanation. (1+2 pts.) A certain company has many customers and some of them have conflict-of-interest (CoI) relationships. Also, employees can only access company data by executing applications approved by the company based on the functions they perform in the company. The people responsible for access provisioning in this company came up with the following scheme.  All files of a given customer must be stored in a single directory (it could be a container-like unit when using cloud storage). Initially, users are allowed to execute applications based on their needs and each application can access files needed by it. Access could be removed when applications execute. In particular,  when user U executes application A which accesses files from customer C’s directory, access to all files in directories of customers who have a CoI relationship with C is turned off for application A when it is executed by U.   Give two examples of policies discussed in the mandatory access control module of the course that could be used to control access to documents by this company. Explain your answer by discussing the specific data access requirements of the company that are satisfied by each policy. (2+2 pts.)  Does the suggested implementation correctly enforce each policy that you recommend for the company? Provide a brief justification for your answer. (2+4 pts.)

For each activity, select the appropriate categories of: cannot count towards practicum hours, restricted activity, or unrestricted activity.  

You are given a directed, connected, weighted graph G=(V,E) with positive edge weights w(e)>0. The weights of all edges are changed to w'(e)=w(e)+1. Let G’=(V,E) be the new weighted graph. Check all statements that are always true.

Nicolas Nickoli, a California resident, and Oscar Oglesby, a Utah resident, receive notification from WalkRunBike, a U.S.-based exercise app, that their full name, username, account password, Social Security number, and medical information has been exposed online after WalkRunBike failed to patch a known vulnerability in their systems. Both Nicolas and Oscar are worried about their information being on the Dark Web, so both individuals continuously monitor their credit reports. Neither Nicolas nor Oscar has found any instances where their personal data has been misused. Can Nicolas and Oscar sue under applicable state laws?

In which part of the spider is its internal organs?

The respiratory organs of most terrestrial forms of arthropods are: