The correct answer is: b. It is free to bind to another promoter and begin transcription
Transcription is the first step of gene expression in which DNA molecule is copied (transcribed) into RNA (mRNA) by RNA polymerase. The process of transcription is divided into three phases:
1. Initiation
• RNA polymerase with transcriptional factors bind to gene promoter
• RNA polymerase unwinds DNA double helix (transcription bubble is formed)
2. Elongation
• RNA polymerases adds nucleotides complementary to DNA
3. Termination
• RNA polymerase gets to stop codon (transcribes a sequence of DNA known as a terminator)
• Formed complementary RNA strand is released from DNA-RNA complex.
RNA polymerase is also released and can transcribe some other gene by binding to its promotor. RNA polymerase will transcribe just the genes whose products are needed at a particular moment.
I Think The answer is a I hope it helps My friend
Answer:
mutations cause most cases of cancer. Some acquired mutations can be caused by things that we are exposed to in our environment, including cigarette smoke, radiation, hormones, and diet. Other mutations have no clear cause, and seem to occur randomly as the cells divide.
Answer:
c. ATP is comprised of a sugar, base, and three phosphate groups
Explanation:
ATP is the energy currency of cells and is formed during the phosphorylation of ADP. The process of ATP formation is endergonic and is often coupled with some exergonic process.
One molecule of ATP consists of one ribose sugar, an adenine base (a purine base) and three phosphate groups. Breakage of phosphoanhydride bond during hydrolysis of ATP into ADP and inorganic phosphate release a large amount of energy.
The phase of mitosis where the chromosomes coil up and condense is at prophase.
