19. Which is NOT a general characteristic of plants?

Question

a. use oxygen to make usable energy
b. primary producers
c. have specialized cells
d. cell walls composed of cellulose
I think it might be either A or B...

24. During initial HIV infection, the HIV virus attaches to CD4 receptors on a macrophage and then
a. attaches to a CCR5 receptor before it's able to enter the cell
b. enters the cell through the CD4 receptors
c. attaches to a lymphocyte that attempts to fight the virus on the macrophage.
d. HIV tricks the reverse transcriptase of the infected cell into making copies of the viral RNA molecule.
A?

-MC

Answer 1

a, a are the best choices. Both are not good choices, but I wont go into that.
...yes I will...
Plants do use oxygen to make usable energy (from glucose, in the process of respiration)especially at night, but the other three choices are worse.
HIV is of two strains, X4 and R5. For R5, a) is the correct answer. For the X4 strain, there is no correct answer. X4 uses the co-recptor CXCR4 to get into the cell.
...

Answer 2

So A for both of them?

-MC

Answer 3

MC --

a, a are the best choices

Answer 4

Right, sorry.

-MC