Question

The ribosomes are present in which of the following?
A. In cytoplasm
B. Upon E. R
C. Upon nuclear membrane
D. Both A and B

Answer 1

Hint: Ribosomes attach to and use messenger RNAs to determine the proper amino acid sequence to create a given protein. By transferring RNA (tRNA) molecules that enter the ribosome and attach to the messenger RNA chain through an anticodon stem-loop, amino acids are chosen and brought to the ribosome.

Complete answer:
First, we should know about ribosomes to answer this question. Ribosomes are macromolecular devices that conduct biological protein synthesis present within all living cells. Ribosomes bind amino acids together to create polypeptide chains in the order defined by the codons of messenger RNA (mRNA) molecules.
Now, let us find the solution from the options-
- Naked ribonucleoprotein particles that are present both in eukaryotic and prokaryotic cells are ribosomes. Ribosomes are found within organelles including mitochondria or chloroplasts in eukaryotic cells. Outside of the cell organelles, they are also available. In the cytoplasm as well as on the membranes of the endoplasmic reticulum or nuclear membrane, the ribosomes that are found outside the cell organelles are available.
- In general, the endoplasmic reticulum (ER) is still the eukaryotic cell transportation mechanism and it has many essential functions, like protein folding. Thus, option B is not the correct option.
- The nuclear shell, also recognized as the nuclear membrane, consists of two bilayer membranes of lipids that protect the nucleus that encircles the genetic material in eukaryotic cells. Thus, option C is not the correct option.

Hence, the correct answer is option (A).

Note: In the three-domain scheme, ribosomes from archaea, bacteria, and eukaryotes mimic each other to an extraordinary degree, confirmation of a shared origin. They vary in their size, sequence, composition, and protein to RNA ratio. The structural differences cause certain antibiotics to destroy bacteria by inhibiting their ribosomes whereas leaving them unaffected by human ribosomes.