The part of the cell which regulates its chemical activities is the...?
407829
In cell biology, the nucleus (from Latin nucleus or nuculeus, kernel) is found in all eukaryotic cells and contains the nuclear genes which form most of the cell's genetic material. Nuclei have two primary functions: to control chemical reactions within the cytoplasm and to store information needed for cellular division.
581242
Control of gene expression through a complex myriad of regulatory genes and regulatory proteins.
764570
The semipermeable membrane that encloses the cytoplasm of a cell.
904760
the list of activities is endless:\n\nDNA replication, mitosis, protein synthesis, lipid synthesis, protein and lipid metabolism, oxidative phosphorylation, cholesterol synthesis, and on and on and on the list goes . . . . of course it all depends on the type of cell.
892741
hormones bind to receptors.  Cells which have the appropriate receptors to which the hormone binds will be responsive.  The answer is C.
140275
The nucleus of the cell is essentially the control centre. It recieves requests on what materials are needed and it sends out  instructions authorising those materials to be manufactured or acquired.\n\nIn that sense the nucleus is probably most similar to City Hall. It doesn't produce anyhting much besides paperwork, but that paperwork is needed to corordinate everyone else in the city and authorise them to produce real things.
362956
Cells requires oxygen for its function. \n\nTo be precise:\n\nThe citric acid cycle (Krebs cycle) is a series of chemical reactions of central importance in all living cells that utilize OXYGEN as part of cellular respiration.
916551
Cytoplasm is the area within the cell inside the plasma membrane (the membrane separate the cell to others) and outside the nucleus (the region contaning genetic materials DNA). Cytoplasm contains many internal organelles (internal structures) that are necessary for cell's functions.\nINternal organelles: Ribosome (needed to make proteins), Golgi complex, lysosomes (digest defective materials in cells, only found in animal cells),Endoplastic Reticulum (2 types: rough with ribosome attached and smooth without ribosome), central vacuole (store H2O, toxins, pigments, waste), Mitochondria (use to make energy for cell, mostly from glucose), chloroplast (needed for photosynthesis in plant cells only),cytoskeleton (connect organelles to each other and membrane, control cell movement, cilia and flagella (cell movements inside an organism).
741348
Cellular respiration : carbon dioxide
16878
It controls all the functions of the cell.
18718
Every where chemica reactions occur to regulate life processes, within your body millions of chemical reactions happen within a second so that you are able to function. Put that on a more macro scale say the environment, everything from water breakdown, decomposition, geologic formation, life cycles, etc are all governed by chemistry. Suffice to say that life would not be possible unless chemistry is relevant and working.
948225
to maintain the concentration level of the cell
827299
That really depends on what kind of chemical reactions you are talking about.  If you want to know where metabolism takes place (breaking down sugars into energy), that would be in the mitochondria.  Synthesis of proteins occurs on the ribosomes.  Degradation of proteins occurs in the lysosomes.  Synthesis of DNA and RNA occurs in the nucleus.  Each part of the cell is involved in very important chemical reactions.
44587
That depends on the type of cell and its function.
695452
each organ performs a specific function for the organism, just like organelles perform a specific function for the cell.  hence organelle, "little organ."
1126141
Basic cell biology:\n\nEndoplasmic reticulum - an organelle found in all eukaryotic cells that modifies proteins, makes macromolecules, and transfers substances throughout the cell.
698862
There are five main ways that enzyme activity is controlled in the cell.\n\nEnzyme production (transcription and translation of enzyme genes) can be enhanced or diminished by a cell in response to changes in the cell's environment. This form of gene regulation is called enzyme induction and inhibition. For example, bacteria may become resistant to antibiotics such as penicillin because enzymes called beta-lactamases are induced that hydrolyse the crucial beta-lactam ring within the penicillin molecule. Another example are enzymes in the liver called cytochrome P450 oxidases, which are important in drug metabolism. Induction or inhibition of these enzymes can cause drug interactions. \n\nEnzymes can be compartmentalized, with different metabolic pathways occurring in different cellular compartments. For example, fatty acids are synthesized by one set of enzymes in the cytosol, endoplasmic reticulum and the Golgi apparatus and used by a different set of enzymes as a source of energy in the mitochondrion, through β-oxidation.\n\nEnzymes can be regulated by inhibitors and activators. For example, the end product(s) of a metabolic pathway are often inhibitors for one of the first enzymes of the pathway (usually the first irreversible step, called committed step), thus regulating the amount of end product made by the pathways. Such a regulatory mechanism is called a negative feedback mechanism, because the amount of the end product produced is regulated by its own concentration. Negative feedback mechanism can effectively adjust the rate of synthesis of intermediate metabolites according to the demands of the cells. This helps allocate materials and energy economically, and prevents the manufacture of excess end products. Like other homeostatic devices, the control of enzymatic action helps to maintain a stable internal environment in living organisms. \n\nEnzymes can be regulated through post-translational modification. This can include phosphorylation, myristoylation and glycosylation. For example, in the response to insulin, the phosphorylation of multiple enzymes, including glycogen synthase, helps control the synthesis or degradation of glycogen and allows the cell to respond to changes in blood sugar. Another example of post-translational modification is the cleavage of the polypeptide chain. Chymotrypsin, a digestive protease, is produced in inactive form as chymotrypsinogen in the pancreas and transported in this form to the stomach where it is activated. This stops the enzyme from digesting the pancreas or other tissues before it enters the gut. This type of inactive precursor to an enzyme is known as a zymogen. \n\nSome enzymes may become activated when localized to a different environment (eg. from a reducing (cytoplasm) to an oxidising (periplasm) environment, high pH to low pH etc). For example, hemagglutinin of the influenza virus undergoes a conformational change once it encounters the acidic environment of the host cell vesicle causing its activation.