A 19 year-old intravenous drug user was exposed to the HIV virus 3 weeks ago and is experiencing a rapid proliferation in viral load. Which statement best captures an aspect of the process of HIV replication that underlies this proliferation?

b) HIV is able to change its RNA into DNA to allow for replication by CD4+ cells

Explanation:

The complete question is as follows:

A 19 year-old intravenous drug user was exposed to the HIV virus 3 weeks ago and is experiencing a rapid proliferation in viral load. Which of the following statements best captures an aspect of the process of HIV replication that underlies this proliferation?

a) Free HIV RNA is able to attach to the cell coat of CD4+ cells

b) HIV is able to change its RNA into DNA to allow for replication by CD4+ cells

c) Expression of reverse transcriptase by CD4+ cells allows replication of HIV cells rather than new lymphocytes.

d) The cytoplasm of CD4+ cells provides a protected environment for the replication of RNA by HIV.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.

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.