How does the complement system aid in the defensive responses of an organism?
A. Lysis of antibody-coated Gram-negative bacteria
B. Activation of phagocytic cells
C. Attraction of phagocytic cells
D. All of the choices are correct.
Answer: D
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The idea of spontaneous Generation postulated that
A. organisms could evolve into the next generation of organisms. B. organisms could spontaneously combust. C. organisms could spontaneously arise from other living organisms. D. living organisms could spontaneously arise from non-living material.
As xylem tissue is forming, its still-living cells deposit secondary wall material on the inner surface of their primary wall, but do not cover over the ____
a. perforation plates b. pits c. pectins d. vessel elements e. plasmodesmata
What do all greenhouse gases have in common?
A. They have complex structures that allow them to contribute to the greenhouse effect by trapping heat energy and rereleasing it into the atmosphere. B. They all precipitate as acid rain. C. They are present in extremely large concentrations in the atmosphere. D. They have simple structures and allow infrared energy to pass through the atmosphere to warm the earth.
An Hfr cell can initiate chromosome transfer from one E. coli to another
Indicate whether the statement is true or false