Light availability within a forest is lowest in the
A) canopy layer.
B) midstory layer.
C) understory layer.
D) ground layer.
D
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Xanthophyll is a pigment found in plants that helps protect the photosynthetic protein D 1 from:
A. water reactions B. chlorophyll C. damage by high temperatures D. damage by excess light energy E. membranes
APCs interact with ____during an antibody-mediated immune response, and with ____ during a cell-mediated
immune response.____
a. CD8+ T cells; CD4+ T cells b. CD4+ T cells; CD8+ T cells c. CD8+ T cells; CD8+ T cells d. CD4+ T cells; CD4+ T cells e. macrophages; CD4+ T cells
Which gene is unique to the Y chromosome?
a. Tinman b. PAX6 c. SRY gene d. P53 e. Eyeless
Which of the following is not a sympoytm of a heart attack
(a) capillaries (b) Nausea and sweating (c) Numbness and aching of arms (d) Paininlegs