Question 2
Riya1475828 wrote:
Question 2 asks how liposomes could be made more useful. To answer this question, it's important to understand why liposomes AREN'T useful in their current state.
The author mentions two problems with liposomes at the end of the last paragraph. The first problem is that liposomes are stuck in the circulatory system and so can't reach "most cell types" -- the cell types that exist
outside of the circulatory system. Why are they stuck in the circulatory system? They can't "pass through the walls of most capillaries" like other drugs can because they are too big. The second issue with liposomes is that the body's immune system tries to remove them.
Which answer choice addresses one of these shortcomings? Starting with (E):
Quote:
E. enable liposomes to travel through the entire circulatory system
Liposomes can ALREADY travel throughout the entire circulatory system. It's just that they can't escape
beyond the circulatory system to get to other organs. Because (E) is already true, it doesn't identify something that would make liposomes more effective than they already are. Eliminate (E).
Here's (A):
Quote:
A. make liposomes smaller
The first problem with liposomes is that they are too big to pass through the walls of most capillaries, which means that they are stuck in the ciculatory system. If liposomes were smaller, that would resolve this issue.
(A) identifies a way to make liposomes more useful, so (A) is the correct answer to question 2.
I hope that helps!