answersLogoWhite

0

Information Science and Libraries

Library and Information Science (LIS) is a discipline wherein the perspectives, practices and tools of management, education and information technology are applied to libraries. LIS is an integration of Library Science and Information Science.

1,171 Questions

Why does the cell need both mRNA and tRNA in order to synthesize a protein like hemoglobin?

DNA and RNA (m and t) are made of nucleotides. Proteins like hemoglobin are composed of amino acids.

The mRNA specifies the sequence information needed for making the hemoglobin protein. This information is a direct and temporary copy of information contained on a gene on DNA.

The tRNA is a separate molecule the carries an amino acid on it. It is like a mediator. It has sequence that matches to a small part of the sequence being specified by the mRNA. When the tRNA moves into the right position on the mRNA, the amino acid detaches from the tRNA and is added to the growing protein or polypeptide chain.

What is the phone number of the Palmerton Area Library Association in Palmerton?

I don't have real-time information on specific phone numbers. It's best to search online or consult a local directory for the most up-to-date contact details of the Palmerton Area Library Association in Palmerton.

How does a market economy relate to the economic environment?

The market economy is the economic environment. This is a broad question though, so it's difficult to understand the intent. See Mises.org for further discussion about how the market works.

Are the vice lords a gemeinschaft community why or why not?

The Vice Lords do not fit the definition of a gemeinschaft community, which typically refers to close-knit, small rural communities where social bonds are strong and relationships are based on kinship and tradition. The Vice Lords are a street gang primarily based in urban areas, known for criminal activities and a hierarchical structure based on power and control rather than communal values.

What are the importance of science in transportation?

The importance of science in transportation is great. Science has helped eliminate greenhouse gas emissions from cars. It has also helped advance vehicles with technology with GPS services, emergency capabilities, and fuel conservation.

List and briefly define three techniques for IO operations?

  1. Blocking IO: The program will pause and wait until the IO operation is complete before resuming. This technique can lead to inefficiency if there are multiple IO operations.

  2. Non-blocking IO: The program continues to run while waiting for the IO operation to complete. This allows for better efficiency when handling multiple IO operations simultaneously.

  3. Asynchronous IO: The program initiates the IO operation and continues executing, without waiting for the operation to complete. A callback function is usually provided to handle the result once it is available. This allows for better performance in handling large numbers of IO operations.

What is a systematic approach to problem solving?

Every organization face problems during any function of a business.To handle these problems, it must be follow in systemic manner to ovoid these undesirable situations.Data is gathered to define problems and opportunities in system context components (input ,process and output) ,alternate solutions are developed then evaluated ,best solution is selected and design and implemented.

Describe 3 examples where friction is useful?

Walking is an example of friction. when friction is formed you may slow down, but you may have a weak balance and fall to your height. friction can be used in many places, like themeparks and ice skating and even on the sole of your shoes.

How many ways can the librarian arrange books on the shelf?

It depends upon how much the librarian wants to find his books. Normally the arrangement of the books would be limited by the Dewey decimal system which classifies books into subject matter and then the shelves would be filled according to the number assigned by the system, with books of equal number being arranged by alphabetical, either by subject or author.

However, assuming a hypothetical librarian who is annoyed as people keep removing bits from his books, the books are incomplete (just like this question is incomplete as there is no indication of how many books he has) and so the librarian wants to make it difficult for the vandals to remove more bits from the same books, or is just plain bored as nobody comes into his library any more as they get all their books from Amazon, let's investigate what he can do:

If he has 1 book, he can only put in on the shelf 1 way.

But if he has 2 books, he has a choice of 2 books to put first, and for each of those choices he has one book left that he can put second, making 2 × 1 = 2 ways.

Not very exciting yet, but now think about if he has 3 books:

He can put any of the 3 first, which leaves 2 choices for the second book for each of the first book, with a final choice for the final book; in this case he has 3 × 2 × 1 = 6 ways.

By similar reasoning we can see for 4 books he can put them 4 × 3 × 2 × 1 = 24 ways;

and for 5 books it is 5 × 4 × 3 × 2 × 1 = 120 ways.

Wow! the librarian must be getting excited as the number of ways he can put his books on his shelves increases dramatically each time he adds a book.

But he has loads (and I mean loads, like hundreds) of books in his library. So how can he get this into a nice little formula? This is now going to get a bit tricky as we use some algebra, but stick with it, it'l be easy algebra:

Let's assume he has n books - n just means any number, like 1, 5, 30, 750, etc. The exact value doesn't matter for the moment.

When he places his books on the shelves, he can choose any of the n books for the first book; this leaves (n - 1) left to be placed on the shelf - this (n - 1) means that whatever value n had, subtract 1 from it, for example if he had 5 books, n = 5 and n - 1 = 5 - 1 = 4, that is after palcing the first of his 5 books he now has 4 left to place.

He can now choose any of the n-1 books left as the next book to place, which leaves (n-1)-1 = n-2 books left to place, and n × (n-1) ways so far.

Repeating this until the last 2 books, which we know he can place in 2 × 1 ways, means he can place the n books in n × (n-1) × (n-2) × ... × 2 × 1 ways.

This value, n × (n-1)× (n-2) × ... × 2 × 1, is know as "n factorial", written as n! (that is n followed by an exclamation mark).

Thus, if he has n books the librarian can arrange them in n! (n factorial) ways.

If he has just 20 books this is 20! = 2,432,902,008,176,640,000 different ways - more than enough to keep the librarian busy until his retirement.

What does pb stand for in a library?

Pb stands for "paperback" in a library, which refers to books that are typically less expensive and lighter weight than hardcover books. Paperback books are often more portable and easier to handle, making them a popular choice for casual reading.

What is the name of the earliest humanlike creatures that lived in Africa three to four million years ago?

Australopithecus Afarensis......The first on found from that group is a female named Lucy a paleoanthropologist named Donald Johanson found her.

What does volume mean in measurement?

Volume is the amount of space occupied by a three-dimensional object or substance. It is typically measured in cubic units, such as cubic meters or cubic centimeters. Volume is calculated by multiplying length, width, and height for solid objects, or by calculating the displacement of a liquid for fluids.

What is a community according to sociology?

In sociology, a community is defined as a group of individuals who share common interests, values, or characteristics and who interact within a defined social structure. Communities can be based on geographic proximity, such as neighborhoods, or on shared identities, such as cultural or professional affiliations. They foster a sense of belonging and can influence social norms, behaviors, and relationships among their members. Additionally, communities play a crucial role in providing support, resources, and a framework for social interaction.