In what part of a chloroplast are chlorophyll and accessory photosynthetic pigments associated?
a. stroma
b. stroma grana
c. thylakoid membranes
d. mesophyll membranes
e. light reaction centers of the stroma lamellae
c
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The ?-subunit of a heterotrimeric G protein is active when bound to ________.
Fill in the blank(s) with the appropriate word(s).
Nine (orders/families/classes) represent the highest level of taxonomic rank used in classifying viruses.
Fill in the blank(s) with the appropriate word(s).
Looking at the figure above, the 2 labelled roots represent which of the items listed below?
1. ancestral populations 2. the common ancestor of birds and crocodilians 3. the common ancestor to all tetrapods 4. the ancestral lineage from which all other lineages on the tree are derived a. Both (1) and (2) but not (3) and (4) b. Both (1) and (3) but not (2) and (4) c. Both (3) and (4) but not (1) and (2) d. (1), (2), (3), and (4)
Please choose the statement that best describes the pathology of most autoimmune diseases.
A) Autoimmune diseases result from autoantibodies that either bring about cytotoxic responses or form immune complexes that provoke inflammation. B) Autoimmune diseases are equally distributed among males and females and various age groups. C) Autoimmune diseases are the result of the destruction of T cells, which impairs cell-mediated responses. D) Autoimmune diseases are caused by overproduction of IgE and the degranulation of mast cells and basophils in response to autoantigens.