The protein that carries oxygen in the red blood cells is
A. myoglobin.
B. hemoglobin.
C. actin.
D. iron.
E. insulin.
B. hemoglobin.
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HIV infection and the subsequent destruction of which cell type is most devastating to overall immune system function?
A. cytotoxic T cells B. memory B cells C. helper T cells D. monocytes E. natural killer cells
Sieve tubes are different from vessel members in that they:
a. carry water, not food b. are not connected to each other c. are alive d. do not require companion cells e. have pits in their walls
The major structural elements of the cytoskeleton are
A) the extracellular matrix and the cell wall. B) microtubules, microfilaments, and intermediate filaments. C) the cytoplasm and cytosol. D) cleavage furrows and G-actin. E) proteoglycans and cellulose microfibrils.
Which of the following is an agent of the sexually-transmitted disease chancroid?
What will be an ideal response?