Which of the following correctly describes quaternary level of structure in proteins?
A) It is when all the amino acids have joined together with
peptide bonds.
B) It is when the hydrogen bonds have interacted with one
another to form shapes such as alpha-helices and beta-
pleated sheets.
C) It is when functional groups have been added to a protein
in the Golgi apparatus
D) It is when several folded proteins interact with one another
to form a protein complex.
E) It is when side groups on the amino acids have interacted to
fold the protein into a specific three dimensional shape.

c

explanation:

hypoxemia refers to a below usual concentration of oxygen in the blood, mainly in the arteries. hypoxemia is an indication of an issue associated with circulation or breathing and may lead to various symptoms like shortness of breath.  

the condition is identified by determining the level of oxygen in the blood sample obtained from an artery. it can also be predicted by determining the oxygen saturation of the blood with the application of a pulse oximeter.  

the normal arterial oxygen is about 75 to 100 mm hg. the values underneath 60 mm hg is generally considered with the requirement for supplemental oxygen. the normal pulse oximeter readings generally range between 95 to 100 percent. the values under 90 percent are regarded as low.  

in the given case, the oxygen saturation is measured at 93 percent, hence, there is no need to administer oxygen, that is, one should withhold oxygen.  

a) carbon, hydrogen

b) carbon, hydrogen, oxygen, nitrogen

c) carbon, hydrogen, oxygen, nitrogen, phosphorus

d) sugar

e) amino acid

f) nucleotide