Which ancestors of modern humans migrated out of Africa to populate the rest of the world?
a. Homo habilis
b. Homo erectus
c. Neanderthals
d. Cro Magnon
e. Homo sapiens
B
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The Golgi complex functions to
A) modify and secrete proteins to the external environment. B) sort proteins used within the cell. C) both modify and sort proteins into those destined for secretion and those that function in membrane structures. D) synthesize proteins.
Magnesium chloride is a salt formed with ionic bonds between one magnesium ion and two chloride ions. Magnesium has two electrons in its outer shell and chlorine has seven electrons in its outer shell. How are the electrons transferred between these atoms?
A. Both magnesium and chlorine are reduced. B. Magnesium is oxidized and chlorine is reduced. C. Chlorine is oxidized and magnesium is reduced. D. Both magnesium and chlorine are oxidized.
________ can usually repair DNA damage caused by ultraviolet light.
A) Photoreactivation B) Ionizing radiation C) DNA replication D) Chromatin remodeling
The endosymbiont hypothesis proposes all of the following EXCEPT
A. chloroplasts originated when a nucleated cell engulfed a cyanobacterium. B. prokaryotes evolved when an aerobic bacterium engulfed a cyanobacterium. C. a nucleated cell engulfed an aerobic bacterium which evolved into mitochondria. D. mitochondria and chloroplasts were once free-living bacteria.