Chapter 2 (Biological Molecules) F.Sc 1st Year Short Questions

Give any two functions of proteins.

Carriers: Some proteins (e.g., hemoglobin) work as carriers and transport specific substances such as oxygen, lipids, metal ions, etc.
Defend body: Some proteins, called antibodies, defend the body against pathogens.

What is the number of amino acids in proteins?

The number of amino acids varies from a few to 3000 or even more in different proteins.

How many types of amino acids occur in cells and how many are found in proteins?

About 170 types of amino acids occur in cells and tissues. Of these, about 25 are constituents of proteins. Most of the proteins are however made of 20 types of amino acids.

Subscribe to Blog via Email

Enter your email address to subscribe to this blog and receive notifications of new posts by email.

How RNA molecules occur?

The RNA molecules occur as single strand, which may be folded back on to itself, to give double helical characteristics.

Whether RNA molecules occur as single strand or double strand?

The RNA molecules occur as single strand, which may be folded back on to itself, to give double helical characteristics.

What is transcription?

It is the process by which RNA is synthesized from DNA.

How many types of RNAs are there? or Name different types of RNA molecules.

There are three types of RNA which are: messenger RNA (MRNA), transfer RNA (TRNA), and ribosomal RNA (TRNA).

Where RNAs are synthesized?

All the three types of RNAs are synthesized from DNA in the nucleus and then are moved out in the cytoplasm to perform their specific functions.

What is the function of mRNA? or define mRNA?

It takes the genetic message from the DNA of the nucleus to the ribosomes in the cytoplasm to form particular proteins.

What is the length of mRNA?

mRNA consists of a single strand whose length depends upon the size of the gene as well as the protein for which it is taking the message. For example for a protein molecule of 1,000 amino acids, mRNA will have a length of 3,000 nucleotides.

What is the percentage of different types of RNAs in the cell?

mRNA is about 3 to 4% of the total RNA in the cell. tRNA comprises about 10 to 20% of the cellular RNA. rRNA may be up to 80% of the total RNA.

Subscribe to brighten your future

An email was just sent to confirm your subscription. Please find the email and click 'Confirm Follow' to start subscribing.

Leave a Reply

Your email address will not be published. Required fields are marked *