Answer:
Correct answer is c. It is the final electron acceptor in the aerobic respiration.
Explanation:
Oxygen is a substrate of the aerobic respiration, but it is not the only one. Glucose is also a substrate.
Oxygen is used in the cells to be the final electron acceptor, this means that receives the electrons from NADH and FADH2. That is why, when there is no oxygen available for aerobic respiration, the NADH and FADH2 cannot be oxidized and therefore remain in their reduced form. As a consequence, they cannot be re-utilized during different cellular processes that are NAD+ and FAD dependant, such as glycolysis, pyruvate oxidation and cellular respiration. This means that the ATP synthesis stops.
Oxygen itself does not transport any electrones, this are transported by the cytochrome complex in the mitochondrial membrane. But oxygen is key in receiving those electrones, therefore a very important piece of the electron transport across the mitochondria.
The preferred injection site is the ventral surface of the forearm and the purified protein derivative (PPD) test is an intradermal test.
<h3 /><h3>Purified protein derivative</h3>
Currently, the only skin test reagent for tuberculosis diagnosis that is commercially accessible is called purified protein derivative (PPD) (TB). The purpose of this work was to create a Mycobacterium tuberculosis-specific skin test reagent that would not produce false positive findings from the Bacillus Calmette-Guerin (BCG) vaccine utilizing recombinant antigens. By comparing the proteins in the M. tuberculosis culture filtrate to the proteins in PPD IC-65 using tandem mass spectrometry, 54 proteins were discovered to be shared. Top candidates ESAT 6, CFP 10, and MPT64 were overexpressed in Escherichia coli expression strains and isolated as recombinant proteins. The antigens were tested on guinea pigs that had been exposed to M. tuberculosis H37Rv and BCG to determine the best immunodiagnostic PPD combinations to use.
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Raloxifene (Evista)
Raloxifene (Evista) is a member of the group of medications known as selective oestrogen receptor modulators (SERMs). It has FDA approval for osteoporosis prevention and treatment in postmenopausal women as well as for lowering invasive breast cancer risk in postmenopausal women with osteoporosis or elevated risk for the disease.
Raloxifene is a drug used to treat and prevent osteoporosis in elderly women and those using glucocorticoids. It is marketed under the trade names Evista, among others. It is less recommended than bisphosphonates for osteoporosis. It also helps patients who are at elevated risk of developing breast cancer to lower their risk.
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