Which of the following occurs during prometaphase (late prophase)?
A) continuous kinetochore microtubule shortening
B) Rho-stimulated formation of a contractile ring
C) centrosome duplication
D) APC targeting of securin destruction
E) nuclear envelope fragmentation
Answer: E
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During neuronal signaling, a change in membrane potential will cause sodium channels to open and let Na+ ions diffuse down their concentration gradient into the cell. Which of the following helps establish the concentration gradient necessary for this process to occur?
A. Na+/K+ channel B. voltage-gated Na+ channel C. Na+ symporter D. Na+/K+ pump
Explain the changes in vegetation observed with increasing elevation. BONUS: Compare this to changes in vegetation
with latitude. What will be an ideal response?
Which is the correct order of steps taken by B and T cells to defend against infection in body fluids and cells?
1. B and T cells move to the lymph nodes, spleen, and other parts of the lymphatic system. 2. B and T cells leave the bone marrow and thymus and move to the bloodstream. 3. B and T cells meet and begin to fight viruses or other infectious agents. 4. B and T cells develop antigen receptors. A) 4, 2, 1, 3 B) 2, 4, 3, 1 C) 4, 3, 2, 1 D) 2, 4, 1, 3
Consider a genetic mutation which causes T helper cells to be unable to respond to stimulation by the cytokines which lead to TH2 differentiation. This mutation would cause a patient to be deficient in which activity?
A) production of memory cells B) action of macrophage C) production of antibodies D) decrease of the immune response once the pathogen is eliminated E) action of cytotoxic T cells