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irakobra [83]
3 years ago
14

Explain Hayflick limit and why are HeLa cells able to live beyond the Hayflick limit?

Computers and Technology
1 answer:
Crank3 years ago
3 0

Answer:

The Hela cells live beyond the Hayflick limit due to the secretion of telomerase in the Hela cells.

Explanation:

Hayflick limit is the number of times a cell divides by mitosis, due to  the continuous shortening of the telomeres at the end of the chromosomes. It only apply to normal living cells.

Hela cells are human cancerous cells found in the cervix or the entrance of the uterus. They cause cervical cancer as they grow uncontrollably, affecting other cells around it.

The Hela cell survive the hayflick limit because it produces a hormone called telomerase, that continuously elongates the telomeres of the chromosomes, for continuous cell division.

You might be interested in
How to build a communication network
FromTheMoon [43]

Answer:

In Building a network, it's important you plan and build one that's appropriate for your business needs.

Explanation:

<u> </u><u>Building a Communication Network </u>

In Building a network, it's important you plan and build one that's appropriate for your business needs.

To start building a network, you must first define your network requirements. These describe why you need a network, how it will be used and enable you to establish some priorities.

Once you've defined your network requirements, you can use these to create a specification for your network.  

<u>You'll need to answer a few key questions: </u>

- Do you need a server? A network server is a powerful computer at the heart of your network, installed on-site. It provides strong control and enables you to run centralized software such as customer relationship management systems. However, it also increases the cost and complexity of your network, and cloud services are now the default for most companies.

- Wired or wireless? Wired networks are fast and reliable, but require cables to be run throughout your premises.

Wireless is versatile, but sometimes less reliable. Many companies use a mix; cables to static computers at desks and wireless for smartphones, tablets and ad-hoc access in meeting rooms.

- What internet connection do you need? A standard fibre broadband connection is usually suitable for smaller companies with up to 30 employees. Larger companies may need a faster, more expensive connection such as a leased line. Don't skimp on your internet connection, particularly if you intend to use cloud computing services or VoIP services.

- How will you keep your network secure? It's very important you take key security precautions to protect your network from hackers, viruses and other online threats.

- Do you need extra software? A network is more than the equipment that links your computers together. In addition to any on-site server operating system, you may also need network security software and a device management solution.

 

<u>Typical IT networks </u>

- A cloud-hosted network, suitable for a small and medium sized business which uses a combination of Software as a Service apps, remote file storage and hosted email. For such networks, the only hardware required on-site would be user devices and a router capable of connecting to the internet.

- A basic network, suitable for a small company with five devices, might simply link the five devices wirelessly, without a central server. This would enable everyone to use the internet and share files. You could set up a network like this for £100 or less.

- An intermediate network might consist of 15 devices, connected by cables. An entry level server would create shared file storage and allow important files to be safely backed up. The company could also run a basic, centralized customer database. A network like this could cost around £2,000.

- An advanced network might include 30 devices and a powerful server, connected by cables. The server would enable the company to run its own intranet, customer relationship management system and collaboration software. A number of shared printers could also be installed, and wireless access offered in common areas and meeting rooms. A network like this could cost £5,000 or more.

<u> Buying equipment and building an IT network </u>

- If you decide to head down the route of building your own IT network, you'll need to purchase the equipment required and install it on your premises. This job can be physical and fiddly, so get help from your IT supplier if you lack the necessary experience within your company.

- Installing cables is usually the first task. It can also cause the most disruption. Then it's usually a matter of plugging everything in, setting up your server (if you have one) and installing any other necessary software.

NOTE: You should be able to set up a simple network without having to delve too deeply into complicated settings. However, setting up a server is particularly tricky, and must be done correctly to keep your data safe from hackers. If you don't have experience of server management, leave it to the experts.

5 0
3 years ago
Which keyboard shortcut can you use to access the go to feature, which will allow you to move quickly to another location in the
I am Lyosha [343]

The keyboard shortcut can you use to access the go to feature, which will allow you to move quickly to another location in the document  is  Ctrl+G or F5.

<h3>What is a keyboard shortcut?</h3>

Keyboard shortcuts are known to be keys or a set of combination of keys that a person can press on one's keyboard to carry out a specified tasks.

By using keyboard shortcuts , one is often often faster than using a mouse  and  to see the option you are looking for, you have to press Ctrl+G or F5.

Learn more about keyboard shortcut  from

brainly.com/question/12531147

8 0
2 years ago
Consider the code fragment below (with nested loops). int sum = 0;for (int i = 1; i &lt; 5; i++) for (int j = 1; j &lt;= i; j++)
sammy [17]

Answer:

Option d is the correct answer for the above question.

Explanation:

  • The first loop of the program has a second loop and then the statement. In this scenario, the second loop executes for the value of the first loop and the statement executes for the value of the second loop.
  • The first loop executes 4 times, Then the second loop or inner loop executes n times for the n iteration of the first loop, for example, 1 time for the first iteration of the first loop, 2 times for the second iteration of the first loop and so on.
  • Then the inner loop executes (1+2+3+4) iteration which gives the result 10 iterations.
  • The sum initial value is 0 and the "sum++", increase the value of the sum by 1.
  • So the value of the sum becomes 10 after completing 10 iterations of the inner for loop.
  • Hence the 10 will be the output. So the Option d is the correct answer while the other is not.
3 0
3 years ago
An online game is played with two dice. In this context, explain what is meant by decomposition
Hunter-Best [27]
You want to throw 2 dice and get (or show?) their value.
    Their value is random, so you need to generate two numbers between 1 & 6.
    You may need to display the numbers
    The main part of the program needs to know the numbers to limit what the user may do next.


That's most of the first level of decomposition. You need to keep decomposing (breaking into smaller simpler pieces) (think of an outline) and deciding what objects, functions, data structures and logic you're going to use to code this.
8 0
3 years ago
Which of these is the function of a modeler?
Liono4ka [1.6K]

Answer:

Create 3D assets from sketches

Explanation:

A modeler Job is to model all of the 3D/2D assets needed to obtain the final result wanted by the developers. The modeler creates the assets from sketches or images provided to him according to the theme.

5 0
3 years ago
Read 2 more answers
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