Throughout its life cycle, it has two different forms: polyp and medusa. Its DNA molecule is bundled into thread-like chromosomal structures in the nucleus of the each cell, giving rise to the first form, called diploblastic.
What is a nucleic acid strand that resembles a thread?A chromosome is indeed a gene-carrying, protein-coated linear thread of DNA that is found in the cell's nucleus and is responsible for transmitting genetic information.
Before it replicates, threadlike DNA is known as what?Response and justification Chromosomes are the thread-like DNA bundles that are visible during cell division. These DNA structures arise from the coiling of DNA strands around histone proteins, which resemble thread on a spool, during in the prophase phase of mitosis.
To know more about chromosomal visit:
https://brainly.com/question/1596925
#SPJ1
do not add any more lactose and watch what transpires. note what happens and why this occurs. how could you re-activate the lacz gene?
The lacZ gene is responsible for the enzyme β-galactosidase which breaks down lactose. When no more lactose is added, the lacZ gene is not activated and the β-galactosidase enzyme does not break down lactose. To re-activate the lacZ gene, you would need to add lactose back in so that the β-galactosidase enzyme is activated and lactose is broken down.
Lactose is a disaccharide sugar composed of glucose and galactose, which is found in milk. Lactose can be hydrolyzed into glucose and galactose through the catalytic action of lactase enzymes. This reaction occurs in the small intestine, and the glucose and galactose are then absorbed and used as energy by the body.
When lactose is present, the lac operon is activated, and the genes involved in lactose metabolism are transcribed into messenger RNA. When lactose is absent, the lac operon is turned off, and these genes are not expressed.
To re-activate the lacZ gene, it is necessary to add lactose or a lactose analog such as IPTG to the culture medium. IPTG is an inducer of the lac operon that does not bind to the repressor protein, allowing the genes involved in lactose metabolism to be expressed even in the absence of lactose.
When lactose is present, the lac operon is activated, and the genes involved in lactose metabolism are transcribed into messenger RNA. When lactose is absent, the lac operon is turned off, and these genes are not expressed.
Therefore, if no more lactose is added to the culture medium, the lac operon will turn off, and the genes involved in lactose metabolism will not be expressed. This occurs because the repressor protein binds to the operator site of the operon, preventing RNA polymerase from transcribing the genes involved in lactose metabolism.
Learn more about lacz gene here:
brainly.com/question/30871045
#SPJ11