What is the function of phloem?
a. It helps the plant prevent desiccation.
b. It transports water and minerals.
c. It transports photosynthetic sugars.
d. It allows for gas exchange.
e. It slows evaporation from the plant.
ANSWER: c
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What initiates the sodium-potassium pump?
A. Three sodium ions bind to the cytoplasmic side of the protein. B. Three sodium ions are translocated out of the cell. C. Phosphorylated pump has low affinity for sodium allowing sodium to leave and potassium to bind. D. Two potassium ions are transported into the cell. E. ATP binds to the protein which becomes phosphorylated (ADP is released).
What are the primary cells of adaptive immunity?
What will be an ideal response?
When individuals are first infected with HIV, early symptoms are flu-like, but when the immune system responds, people recover from these flu-like symptoms and then can become asymptomatic for as long as 10 years
However, HIV eventually wins its battle with the immune system, and individuals will eventually show symptoms of AIDS. Why does HIV eventually win its battle with the immune system? A) HIV is a latent virus and only actively reproduces when conditions are perfect. B) HIV is constantly reproducing but doesn't produce the vital toxins necessary to kill T4 cells until a certain period of time has passed. C) During the asymptomatic period, new variants of HIV arise, and antibodies produced against earlier variants don't recognize the new variants. D) The population of HIV doesn't change during the asymptomatic period, and therefore, antibodies that were produced originally against it are destroyed by the spleen.
Temperature tends to decline with longitude.
Answer the following statement true (T) or false (F)