Energy gathering or concentrating mechanisms that allow light to be collected more efficiently during photosynthesis are called
A. mitochondria.
B. photosystems.
C. light-independent reactions.
D. ribulose.
B. photosystems.
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The hemocyanin of arthropods and molluscs differs from the hemoglobin of mammals in that _____
A) the oxygen dissociation curve for hemocyanin is linear B) hemocyanin carries appreciably more carbon dioxide C) hemocyanin has protein coupled to copper rather than to iron D) the protein of hemocyanin is not bound to metal E) hemocyanin includes cyanic acid
The main structural component of a plant cell wall is
A) extracellular matrix B) cellulose C) cytoskeleton D) middle lamella E) plasmodesmata
What was a surprising feature about the deadly nature of the 2009 H1N1 influenza virus?
A) H1N1 affected the elderly. B) H1N1 affected healthy young people. C) H1N1 affected birds. D) H1N1 affected pigs.
What tissue makes up most of the wood of a tree?
A) primary xylem B) secondary xylem C) secondary phloem D) vascular cambium