Both B cells and T cells make up the third line of defense against pathogens but do so in different ways. How do B cells function?
A) They attack and kill infected body cells.
B) They make and secrete antibodies.
C) They detect invaders and alert T cells.
D) They present antigens to T cells.
B
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Comparatively greater energy is released when
A. carbon dioxide is the final electron acceptor. B. hydrogen is the final electron acceptor. C. nitrate is the final electron acceptor. D. oxygen is the final electron acceptor.
Paraoxon is a toxic compound that disrupts the transmission of signals in the ____________________ system and can
cause headaches, blurred vision, tremors, unconsciousness, and death by ____________________ arrest. Fill in the blank(s) with the appropriate word(s).
You go on a canoe trip to the Boundary Waters Canoe Area (BWCA) in Northern Minnesota. This ecosystem is cold most of the year and receives plenty of rainfall. It has many lakes that are full of walleye pike fish. You know that walleye like to eat minnows. In turn, the minnows feed on scuds (zooplankton) which eat algae (phytoplankton). In this system, the zooplankton are the
A. primary consumers B. decomposers. C. producers. D. secondary consumers.
As part of your research project, you travel to an island to learn more about the habitats and relationships of flies, spiders, and centipedes. You and your assistant plot out five different areas on the island and count the numbers of flies, spiders, and centipedes living in each plot. Your results show the following: Plot Flies Spiders Centipedes1300254242617103147152147397805791393The hypothesis that closely matches the data provided is:
A. herbivorous insects survive best on islands where spiders and centipedes live. B. herbivorous insects and spider populations are decreased by centipedes. C. herbivorous insects feed on spiders and centipedes. D. spiders are the top predators on all islands.