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

Biology & Microbiology

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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

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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

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Maternal messages in the form of mRNA is

distributed during

a. zygote formation. b. gastrulation. c. cleavage. d. neurulation. e. blastulation

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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

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