In the scientific name of humans, Homo sapiens, the term Homo is the
A) class. B) family. C) genus. D) species. E) order.
C
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Curved, microaerophilic, gram-negative rods, with most species having strong urease activity and the majority of which colonize mammalian stomachs or intestines, describe which group of bacteria?
a. Campylobacter b. Helicobacter c. Arcobacter d. Enterobacter
A chimpanzee's closest extant relative is a(n)
A. orangutan. B. mandrill. C. South American spider monkey. D. human.
Integral membrane proteins
1.are embedded in the membrane. 2.sit on the surface of the membrane. 3.are easy to remove from the membrane. 4.are chains of simple sugars. 5.always go completely across the membrane.
The greenhouse effect is due to high levels of which gas in the environment?
A. carbon dioxide B. carbon monoxide C. nitrogen D. ammonia E. oxygen