Which of the following is TRUE of both T cells and B cells?
A. They are lymphocytes.
B. They recognize specific antigens on the cell surface.
C. They have class I MHC molecules on their cell surface.
D. They are involved in the humoral immune response.
E. All of the responses are correct.
E. All of the responses are correct.
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How does water pass from the root epidermal cells to the xylem in the center of the root?
What will be an ideal response?
Which of the following has not been an effective treatment for syphilis?
A. Vancomycin B. Arsenic C. Penicillin G D. Mercury
Which of the following statements is false?
a. Xylem vessels are similar to drinking straws. b. The transport of water in xylem is due to positive pressure generated by the root. c. Water evaporates mainly through stomata. d. Water is drawn up to the top of a tree by the pull of transpiration. e. Plants absorb the majority of needed elements from water and soil
Store-bought hybrid tomatoes are very popular with consumers. Suppose you buy a tomato from the grocery store, collect seeds from it, and plant the seeds
If the seeds do not germinate, the seedlings fail to thrive, or the plants die quickly after sprouting, what reproductive isolating mechanism might be responsible?