Homo sapiens first appeared during the
A. Tertiary period.
B. Cretaceous period.
C. Mesozoic era.
D. Quaternary period.
E. Permian period.
D. Quaternary period.
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Electrons move between PSII and PSI via __________
A. cytochrome b6f B. water C. chlorophyll D. NADP+ E. NADPH
Endosperm tissue arises by the fusion of a sperm nucleus with two nuclei of the:
A. male gametophyte B. female style C. ovule wall D. female egg E. female gametophyte central cell
Some genes can bring about radical changes in body shape and organs. The Pax6 gene is one such gene and is involved in
A. eye formation in all animals. B. breast cancer. C. the development of limbs. D. determining the location of repeated structures in all vertebrates.
The primary risk to humans infected with Echinococcus granulosus is
A) development of cysticerci. B) formation of hydatid cysts. C) intestinal obstruction. D) anemia. E) infection of the fetus.