The phenomenon of fusion is likely to occur when, after a period of geographic isolation, two populations meet again and _____
A) an increasing number of infertile hybrids is produced over the course of the next one hundred generations
B) no reproduction occurs in the hybrid zone
C) an increasing number of viable, fertile hybrids is produced over the course of the next one hundred generations
D) a decreasing number of viable, fertile hybrids is produced over the course of the next one hundred generations
C
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Why do most replication errors occur?
a. DNA polymerases work very fast and mistakes are inevitable. b. DNA repair mechanisms do not work well. c. DNA replication is a slow and uncommon process. d. The hydrogen bonds between base pairs are weak. e. DNA ligase often binds incorrect sections of DNA.
This photograph shows a leaf-cutter ant carrying a leaf back to its underground garden, where the leaf will be digested by the fungi that live there. Why does the leaf-cutter ant do this?
a. Feeding leaves to the fungi prevent them from digesting the ant’s young.
b. The fungi emit pheromones that repel the ant’s natural predators.
c. Leaf-cutter ant eats the fungi that grow on these leaves in its garden.
d. The fungi have infected the ant’s nervous system to control it like a puppet.
Which of the following cells do not kill cells directly?
A. T cells B. macrophages C. natural killer cells D. B cells E. neutrophils
The major source of naturally-produced penicillin is the mold ________.
What will be an ideal response?