When a peptide hormone reaches its target cell, which event happens next? A. It binds itself to the receptors present on the sur
face of the cell membrane, which activates the enzymes present inside cell. B. It passes through the cell membrane and attaches itself to a receptor protein present in the cytoplasm. C. It passes on the signal to the secondary messengers inside the cell, which activate the receptors on the cell membrane.
A. It binds itself to the receptors present on the surface of the cell membrane, which activates the enzymes present inside cell.
Explanation:
Peptide hormones being hydrophilic cannot cross the plamsa membrane of cell which is largely made up of phospholipids so in order to show their impact and participate in the signal transduction pathway they are bound to interact with the cell surface receptors first. Their interaction with the receptor, activates various intracellular enzymes of the cell which ultimately leads to the physiological response within the cell. GPCR is the best example of cell surface receptor to which hormones like epinephrine and nor epinephrine bind. They bind themselves to the receptors present on the surface of the cell membrane, which activate the enzymes present inside cell. In contrast to this, steroid hormones being hydrophobic can cross the cell membrane directly and attach themselves with the intracellular receptors to show their impact.
"It binds itself to the receptors present on the surface of the cell membrane,which activates the enzymes present inside cell" is the one event that happens next when <span>a peptide hormone reaches its target cell. The correct option among all the options that are given in the question is the first option or option "A". </span>
Fever, weight loss, and candida infections are symptoms of immunodeficiency. These symptoms only appear if the level of CD4+ count is below normal, resulting in disruption of the immune cells work. The threshold level of CD4 count to cause immunodeficiency symptoms is 200 cells per microliter.
Replication is the process by which cells duplicate their genetic material (DNA or deoxyribonucleic acid) before undergoing the process of cell division so that each copy of the duplicated DNA is incorporated in each of the daughter cells produced after the process of mitosis (cell division).
The parent bacteria also transmit their genetic material to the daughter bacteria by the same process.
There are many enzymes required for the process of DNA replication:
DNA polymerase : synthesizes new daughter DNA strand.
Helicase: unwinds the parental DNA double helix.
Toposiomerase: uncoils the DNA supercoils.
Primase: synthesize short fragments of RNA, called Primers, those provide the 3' hydroxyl group for the purpose of nucleotide addition by DNA polymerase.
Ligase: anneals the Okazaki fragments generated on the newly synthesized lagging DNA strand.
Antibacterials target to kill (bactericidal) or prevent the growth (bacteristatic)of bacteria.
This is possible by inhibiting the process of replication in the bacteria.
Replication can be inhibited by inhibiting any of the above enzymes which are necessary for the operation of the replication process in the correct manner.
