Which of these substances are most important in the establishment of biofilms?
A) hemolysins
B) invasins
C) adhesins
D) exotoxins
E) siderophores
Ans: C) adhesins
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When assessing the role of conjugative bacteria in the spread of antibiotic resistance genes, it is fair to say that Hfr cells contribute most while F- cells contribute least.
Answer the following statement true (T) or false (F)
B cells are more effective than macrophages in presenting antigens to activate T cells when
A. antigen concentrations are low. B. macrophages are in short supply. C. antigen concentrations are high. D. None of the choices are correct.
Based on Charles Darwin's observations in the Galapagos Islands, why did the variety finches have different types of beaks?
What will be an ideal response?
In the figure shown at the right, ____ is the structure labeled as Y
Fill in the blank(s) with the appropriate word(s).