Which of the following lacks a nucleus?
a. bacterial cell.
b. fungus cell.
c. animal cell.
d. protist cell.
e. all of these have a nucleus
A
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The unique attractive forces that keep molecules of water together are called:
a. strong forces. b. adhesion. c. hydrogen bonds. d. cohesion. e. weak nuclear forces.
In the section "Investigating Life: Evolving Backwards," how did the scientists test the hypothesis?
A. They examined decrease in length of hind limbs in marine snakes. B. They compared anatomy of fossil ancestors and extant snakes. C. They compared anatomy of snakes, other reptiles, mammals, and birds. D. They examined decrease in length of hind limbs in land-dwelling snakes.
What naturally occurring process is responsible for keeping the earth warm enough to sustain life?
A. Oceanic currents B. Decomposition C. Atmospheric circulation D. Greenhouse effect E. Wildfires
C-reactive protein is a
A) pathogen-associated molecular pattern (PAMP). B) homotrimeric adaptor protein. C) lipoprotein. D) pattern recognition receptor (PRR).