What is the primary goal of cybersecurity?

Protecting data from cybercriminals

Collecting personal information

What are the three levels at which data needs protection?

Personal, organizational, government

Personal, social, international

Social, technological, economic

What is identity theft in the context of cybersecurity?

Stealing someone's medical benefits

Creating fictional personas for research

Collecting data for social media profiles

Network threads | Quizalize

The cytoskeleton is a network of thin tubes and filaments that crisscrosses the cytosol. The tubes and filaments give shape to the cell from the inside in the same way that tent poles support the shape of a tent. The cytoskeleton also acts as a system of internal tracks, shown in Figure 4-18, on which items move around inside the cell. The cytoskeleton’s functions are based on several struc- tural elements. Three of these are microtubules, microfilaments, and intermediate filaments, shown and described in Table 4-2. Microtubules Microtubules are hollow tubes made of a protein called tubulin. Each tubulin molecule consists of two slightly different subunits. Microtubules radiate outward from a central point called the centrosome near the nucleus. Microtubules hold organelles in place, maintain a cell’s shape, and act as tracks that guide organelles and molecules as they move within the cell. Microfilaments Finer than microtubules, microfilaments are long threads of the beadlike protein actin and are linked end to end and wrapped around each other like two strands of a rope. Microfilaments con- tribute to cell movement, including the crawling of white blood cells and the contraction of muscle cells. Intermediate Filaments Intermediate filaments are rods that anchor the nucleus and some other organelles to their places in the cell. They maintain the inter- nal shape of the nucleus. Hair-follicle cells produce large quantities of intermediate filament proteins. These proteins make up most of the hair shaft. 84 CHAPTER 4 TABLE 4-2 The Structure of the Cytoskeleton Property Microtubules Microfilaments Intermediate filaments Structure hollow tubes made of two strands of intertwined protein fibers coiled into coiled protein protein cables Protein subunits tubulin, with two subunits: å actin one of several types of and ∫ tubulin fibrous proteins Main function maintenance of cell shape; cell maintenance and changing of maintenance of cell shape; motility (in cilia and flagella); cell shape; muscle contraction; anchor nucleus and other chromosome movement; movement of cytoplasm; cell organelles; maintenance of organelle movement motility; cell division shape of nucleus Shape Microtubules provide a path for organelles and molecules as they move throughout the cell. FIGURE 4-18 Microtubules Nucleus Endoplasmic reticulum Mitochondrion Ribosomes Copyright © by Holt, Rinehart and Winston. All rights reserved. Copyright © by Holt, Rinehart and Winston. All rights reserved. CELL STRUCTURE AND FUNCTION 85 1. Explain how the fluid mosaic model describes the plasma membrane. 2. List three cellular functions that occur in the nucleus. 3. Describe the organelles that are found in a eukaryotic cell. 4. Identify two characteristics that make mitochon- dria different from other organelles. 5. Contrast three types of cytoskeletal fibers. CRITICAL THINKING 6. Relating Concepts If a cell has a high energy requirement, would you expect the cell to have many mitochondria or few mitochondria? Why? 7. Analyzing Information How do scientists think that mitochondria originated? Why? 8. Analyzing Statements It is not completely accurate to say that organelles are floating freely in the cytosol. Why not? SECTION 3 REVIEW During cell division, centrioles organize microtubules that pull the chromosomes (orange) apart. The centrioles are at the center of rays of microtubules, which have been stained green with a fluorescent dye. FIGURE 4-20 Cilia and Flagella Cilia (SIL-ee-uh) and flagella (fluh-JEL-uh) are hairlike structures that extend from the surface of the cell, where they assist in movement. Cilia are short and are present in large numbers on certain cells, whereas flagella are longer and are far less numerous on the cells where they occur. Cilia and flagella have a membrane on their outer surface and an internal structure of nine pairs of micro- tubules around two central tubules, as Figure 4-19 shows. Cilia on cells in the inner ear vibrate and help detect sound. Cilia cover the surfaces of many protists and “row” the protists through water like thousands of oars. On other protists, cilia sweep water and food particles into a mouthlike opening. Many kinds of protists use flagella to propel themselves, as do human sperm cells. Centrioles Centrioles consist of two short cylinders of microtubules at right angles to each other and are situated in the cytoplasm near the nuclear envelope. Centrioles occur in animal cells, where they organize the microtubules of the cytoskeleton during cell division, as shown in Figure 4-20. Plant cells lack centrioles. Basal bodies have the same structure that centrioles do. Basal bodies are found at the base of cilia and flagella and appear to organize the devel- opment of cilia and flagella.

Revealing personal data can lead to threats like identity theft, fraud, bullying, and blackmail. 1.Identity Theft Definition: Identity theft occurs when someone steals your personal information and uses it without your permission. This can include your name, Social Security number, or bank details. Example: If someone gets your Social Security number, they could open a credit card in your name and run up bills that you would have to pay. 2.Fraud Definition: Fraud is when someone deceives another person to gain something of value, like money or personal information. This is often done through lies or tricks. Example: A person might call you pretending to be from your bank and tell you that you need to confirm your account details. If you give them your information, they may steal your money. 3. Bullying Definition: Bullying is when someone repeatedly hurts, threatens, or picks on another person. This can happen in person or online (cyberbullying). Example: If someone sends hurtful messages or spreads rumors about you on social media, that’s a form of bullying. 4. Blackmail Definition: Blackmail is when someone threatens to reveal harmful or embarrassing information about you unless you give them something they want, usually money or favors. Example: If someone takes a private photo of you and threatens to share it unless you pay them, that’s blackmail. Summary Identity Theft: Stealing personal information for illegal use. Fraud: Deceiving someone for personal gain. Bullying: Repeatedly hurting or threatening someone. Blackmail: Threatening to expose information unless demands are met. Understanding these terms helps you recognize and protect yourself from potential dangers in both real life and online. If you see any signs of these actions happening, it’s important to talk to a trusted adult or authority figure. There are several guidelines for you to be aware of to keep your personal data confidential: •Have strong passwords set on any account that holds personal data. Stronger passwords include characters, numbers and symbols and are not a recognisable word. •Encrypt (scramble text so that it cannot be read without a decryption key) any personal data that you store on your computer. •Have a firewall present, scanning incoming and outgoing data from your computer system. firewall : a security measure that can be implemented to monitor traffic into and out of a computer and prevent external users gaining unauthorised access to a computer system. A firewall is a security measure that helps protect a computer system by monitoring and controlling the traffic that comes into and goes out of the system. Think of it as a barrier between your computer and the outside world. It prevents unauthorized users from accessing your computer while allowing authorized traffic to pass through. •Regularly scan your computer with preventative software, such as an anti-virus package, that is used to identify a virus on a computer and remove it. Anti-virus: software that is used to identify a virus on a computer and remove it •Make use of any biometric devices (devices that measures a person's biological data, such as thumbprints), that are built into technology. biometric devices: Unique physical characteristic of a person that can be used by a computer for identification purposes. https://www.aratek.co/news/biometric-devices-definition-and-examples Biometric devices are tools that use unique physical characteristics of a person for identification purposes. This means they can recognize who you are based on features that are unique to you. Here are some examples of biometric characteristics: Fingerprint Recognition, Facial Recognition, Voice Recognition •Only visit and provide data to websites that are a trusted source. •Do not open any email attachments from a sender you do not recognise. •Check the URL attached to any link requesting data to see if it is genuine. •Be cautious about any pictures or opinions that you post or send to people. •Remove data about your location that is normally attached to your photos and videos that you may post, such as geotags. Geotag: an electronic tag that assigns a geographical location A geotag is an electronic tag that assigns a specific geographical location to a piece of information, like a photo or a video. Geotags can help people understand where a photo was taken or where an event occurred, making it easier to organize and find information based on location. •Do not become friends on social networking sites with people you do not know. •Set all the privacy controls to the most secure setting that are available on social media accounts. •Report and block any suspicious user. •Use a nickname or pseudonym when using the internet for entertainment, for example, playing games. •If it is possible, use a virtual private network (VPN), an encrypted connection that can be used to send data more securely across a network. Virtual private network (VPN) : an encrypted connection that can be used to send data more securely across a network A Virtual Private Network (VPN) is a special way to connect to the internet that keeps your information safe. Imagine you are sending a secret message to a friend. You want to make sure no one else can read it while it travels. A VPN helps you do just that! It creates an encrypted connection, which means it turns your message into a code that only your friend can understand Example: Public Wi-Fi Safety: When you use public Wi-Fi, like in a café, your data can be easily accessed by hackers. If you connect to a VPN while using that public Wi-Fi, your data is encrypted, making it much harder for anyone to steal your information.

1.1 Hardware and software ,Differences between types of operating systems Advantages and disadvantages of the different types of operating systems,Impact on everyday life including Artificial Intelligence (AI),Characteristics, uses, advantages and disadvantages of storage media including magnetic, optical and solid-state,Including: network interface cards (NIC), hubs, bridges, switches,Local Area Network (LAN), Wireless Local Area Network (WLAN), Wide Area Network (WAN) and the differences between these networks,Avoiding password interception by using up to date anti-spyware and regularly changing passwords The differences between strong and weak passwords Other authentication methods Including: zero login, biometric methods, magnetic stripes, smart cards, physical tokens, electronic tokens,Characteristics and uses including newsletters, posters, websites, multimedia presentations, audio, video, media streaming and ePublicationsCharacteristics and effect of threats to data including hacking, phishing, pharming, smishing, vishing, viruses, malware, card fraudLocate stored files Open and import files of different types Save files in a planned hierarchical directory/folder structure Save files using appropriate file names Save and print files in a variety of formats including a document, screenshots, database reports, data tables, graphs/charts, a web page in browser view, a web page in HTML view Use HTML in the content layer Notes and Guidance Create the content layer of a web page

Protecting networks from security threats

Threats posed to networks

Network

Network Systems & Social Computing Cloud Computing

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