Lactase is enzyme composed of a polypeptide hydrolyzes the disaccharide lactose to produce monarchies. the optimal ph for lactase activity is 6. transfer of lactase to ph 5 results in a substantial decrease in enzyme activity, likely due to the disruption of 1) only the primary structure of the enzyme. 2) the secondary and tertiary structure of the enzyme. 3) the primary and secondary structure of the enzyme. 4) the secondary, tertiary, and quaternary structure of the enzyme.

1. dermis

2. chemical

3. urine

4. viruses

5. antibodies

the correct answer is c   with the systems

i think its white blood cells

i hope this

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.