Approximately what percent of the energy at one trophic level is passed on to the next highest trophic level?
a. 0-5
b. 5-10
c. 10-15
d. 15-20
e. 90-100
Ans: b. 5-10
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The immunological synapse refers to the
A) interaction between a T cell and an antigen-presenting cell to produce a specialized cell-to-cell contact area. B) activation of a B cell to become a plasma cell. C) interaction between lymphocytes and foreign antigens to produce memory cells. D) binding of a monocyte or macrophage to antigen so that it can act as an antigen-presenting cell. E) interaction of the many cytokines produced by different immunological cells.
The protozoal disease known as (cutaneous/mucocutaneous/visceral) leishmaniasis is potentially fatal.
Fill in the blank(s) with the appropriate word(s).
Explain how Clostridium tetani cells that rarely leave their initial site of infection can cause death in their hosts
What will be an ideal response?
CAM and C4 have evolved multiple times in a range of vascular plants because __________. (Select all correct answer options.)
A. no novel enzymes or biochemical pathways are required B. C4 and CAM photosynthesis likely evolved from C3 ancestors C. gene expression changed D. land plants evolve rapidly