A particle that consists of nucleic acids surrounded by protein and requires a host organism to replicate is
A. a prion.
B. a viroid.
C. a prokaryote.
D. a virus.
E. a plasmid.
Answer: D
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When you are upright, what is the primary mechanism that propels blood in your feet back to your inferior vena cava?
A. recoil of elastic fibers in the walls of the leg veins B. contraction of the left ventricle of the heart C. contraction of smooth muscle in the walls of the leg veins D. contraction of skeletal muscles in your legs E. the valves in the leg veins alternating between open and closed
Darwin observed that
A. organisms in a normal population differ in reproductive success. B. members of a population vary in their functional, physical, and behavioral characteristics. C. there is a constant struggle for survival of organisms. D. All of the choices are correct. E. None of the choices are correct.
Genetically modified organisms that acquire genes from a different species are called ________ organisms
A) mutant B) synthetic C) cloned D) transgenic
The ________ is the baby's contribution to the placenta
Fill in the blank(s) with correct word