Biology

posted by .

19. Which is NOT a general characteristic of plants?
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

  • Biology -

    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.
    ...

  • Biology -

    So A for both of them?

    -MC

  • Biology -

    MC --

    a, a are the best choices

  • Biology -

    Right, sorry.

    -MC

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. BIOLOGY

    IS A PLANT CELL AN EXAMPLE OF A UNICELLULAR ORGANISM?
  2. Biology

    Bacterial cells are prokaryotic. Select two structures of bacterial cells and briefly describe them; what do they look like, what are they composed of?
  3. biology

    If an elephant's cell were to lose ability to perform aerobic cellular respiration, would would most likely happen?
  4. Biology

    19. Which is NOT a general characteristic of plants?
  5. Biology

    19. Which is NOT a general characteristic of plants?
  6. biology

    specialized cells in animals are all descended from a single ancestor cell.How are the specialized and the nonspecialized cells of the cellular slime molds related?
  7. botany

    what is the difference between primary walls and secondary walls in plants. (specifically sclerencyma cells- which have secondary and parenchyma and collenchyma - which just have primary walls
  8. science help ASAP please

    1. Angiosperms have organs such as ______________ and produce seeds. The are described as _________________plants. (1 point) flowers; vascular stems; pollinated rhizoids; vascular leaves; non-vascular 4. Of the following, which is …
  9. Science

    #1 Which of the following allows a plant's vascular system to work as a transport system?
  10. Biology

    Which of the following helps explain why fungi are now classified in a separate kingdom from plants?

More Similar Questions