Answer:
Reproduction
Explanation:
Reproduction is the process which allows organisms to create more organisms.
hope it helps!
You should post the diagrams but basically there are more cells than tissues and more tissues than organs
Moving a car and flying an airplane
Answer:
Leptin is a protein hormone composed of 167 amino acids of the cytosine family, it is synthesized mainly by white adipose tissue. The leptin receptor is related to that of receptors for cytosines (since it uses Janus or JAK type kinases and STAT-3 proteins as intracellular mediators of transcription pathway), it is predominantly found in the hypothalamus (particularly in the arcuate nucleus and to a lesser extent in the nuclei dorsomedial and ventromedial), hippocampus and cerebellum. There is evidence that leptin acts at the level of the arcuate nucleus, preventing the formation of NPY.
Explanation:
Leptin is produced exclusively in adipose tissue cells in a wide variety of species, including humans, and its concentration is higher in overweight than in lean individuals. The biological actions of leptin can be classified into two groups, those that are exerted in the tissues of the central nervous system, mainly the hypothalamus, and those that are carried out on the peripheral tissues. The former regulate body weight downward, decrease food intake, increase basal energy expenditure and modify some neuroendocrine functions such as reproduction, while the latter have effects on proliferation, differentiation and metabolism of peripheral tissues. The leptin that reaches the hypothalamus, in addition, inhibits protein synthesis and the secretion of neurons producing NPY / AgRP of the arcuate nucleus and stimulates the synthesis and secretion of those containing POMC. NPY (neuropeptide Y) is produced in the hypothalamic arcuate nucleus. This neurotransmitter arrives through the projections of the neurons of said nucleus to the paraventricular nucleus, which is the area where it is released. There are several studies that have shown that an increase in NPY leads to an increase in the sensation of hunger and thus to hyperphagia and obesity. Leptin acts at the level of the arcuate nucleus, preventing the formation of NPY. The leptin receptor lacks enzymatic activity in its intracellular domain. Instead, it is linked to members of the janus kinase family, which belong to a class of tyrosine kinases. The binding of the ligand activates the Jak kinase and leads to the phosphorylation of certain cytoplasmic proteins. Within these proteins there is a class of cytoplasmic transcription factors called signal transducers and activators of transcription (STAT).
Answer: C) Populations have no effect on their environment.
Ecology is a branch of biology which deals with the relation of organisms with each other and with their surrounding environment. A population can have a negative or positive effect on the environment also, the environment can exert positive or negative effect on the organisms in an ecosystem.
Populations can have negative effects on their environment: Human population utilizes fossil fuels for transportation causing air pollution it is an example of negative effect on the environment.
Populations can affect the size of other populations: Increase in predator population restricts the growth of prey populations.
Populations can adapt to changes in the environment: Organisms undergo favorable adaptation in order to increase chances of survival against changing environment.
On considering the above points this can be concluded that populations have no effect on their environment would least likely show up in his notes.
