The function of the nucleolus is to transcribe DNA into ribosomal RNA and assemble rRNA into ribosomal subunits. The creation of rRNA is important because rRNA makes up ribosomes which are responsible for protein synthesis in the cell.Know More
In order for transcription to occur, a protein called RNA polymerase binds to DNA at its promoter region. Transcription factors and proteins pull apart DNA's double helix so that polymerase can then transcribe one strand of the DNA to create single-stranded RNA. Transcription ends when polymerase reaches a terminator sequence on the DNA.
When DNA is transcribed into rRNA in the nucleolus, three or four (depending on the organism) distinct rRNAs are produced. These rRNAs are combined with proteins in order to assemble a large ribosomal subunit and a small ribosomal subunit. The subunits are then exported from the nucleolus and nucleus to the endoplasmic reticulum and the cell's cytosol in order to carry out the process of translation, or protein synthesis.
Nucleoli are made of proteins, DNA and RNA and are contained within the cell's nucleus. They don't have membranes, so they can disassemble when the cell divides during mitosis. While humans only have one nucleolus per cell, other organisms exist that can have cells containing multiple nucleoli.Learn More
ATP is called the energy currency of the cell, and of life, because it is the energy molecule that all cells need in order to do anything within the human body. The molecule is used like a battery within cells and allows the consumption of one of its phosphorous molecules.Full Answer >
Ribosomes are composed primarily of ribonucleic acid and proteins. They are responsible for the translation of genetic data from amino acids into simpler proteins for use in cell functions.Full Answer >
Certain types of bacteria can cause diseases, such as, typhoid fever, syphilis, cholera, tuberculosis and foodborne illnesses. Antibiotics are used to kill harmful bacteria and the diseases they cause.Full Answer >
The Calvin cycle takes place in the stroma of the chloroplast. Carbon dioxide enters the stroma of the chloroplast to combine with the five-carbon compound called ribulose1, 5-Biphosphate to form two molecules of a three-carbon compound called 3-Phosphoglyceric acid. This reaction is catalyzed by an enzyme called Ribulose bi-phosphate Carboxylase.Full Answer >