The prochlorophytes are unique among the Cyanobacteria in that ALL species in the group contain
a. chlorophyll a and b.
b. bacteriochlorophyll.
c. phycobilins.
d. all of the above.
Answer: A
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In the acid-base reaction described in the preceding paragraph about Nakano's research on RNAs, a proton (H+) is being transferred. What is acting as the proton acceptor?
A) cytosine B) magnesium hydroxide C) the virus D) cytosine, magnesium hydroxide, or the virus
Which of the following is a characteristic of biodiversity hotspots?
a. high percentage of degraded habitat b. small number of endemic species c. encroachment of human habitats d. widespread poaching problems
Maternal messages in the form of mRNA is
distributed during
a. zygote formation. b. gastrulation. c. cleavage. d. neurulation. e. blastulation
During presentation of APC-bound antigen, macrophages and dendritic cells secrete the cytokine ________, which activates T helper cells.
A. histamine B. interleukin-2 C. interferon D. interleukin-1