The high-energy electrons of photosystem I are directly passed on to ____
A), ferrodoxin.
B), plastoquinone.
C), plastocyanin.
D), ATP synthase.
Ans: A), ferrodoxin.
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Establishment of lysogeny by phage is usually influenced strongly by
A. the physiological condition of the host at the time of infection. B. components of the host replication machinery. C. the previous host infected by the virus. D. None of the choices are correct.
Chemical evolution started on Earth
a. after the appearance of prokaryotic cells. b. long before any cells emerged. c. after the appearance of eukaryotic cells. d. after the appearance of eukaryotic cells but before the appearance of multicellular organisms. e. after the appearance of multicellular organisms.
Plant cells with their cell walls removed are called ________
A) calluses B) protozoa C) protoplasts D) germplasm E) auxins
The 2-m height attainable by Polytrichum moss is at the upper end of the size range reached by mosses. What accounts for the relative tallness of Polytrichum?
A) the cuticle that is found along the ridges of ?leaves? B) ?leaves? that are more than one-cell-layer thick C) high humidity of surrounding air provides support against gravity D) reduced size, mass, and persistence of the sporophytes allows gametophores to grow taller E) the presence of conducting tissues in ?stem?