Eukaryotic cells acquired mitochondria and chloroplasts by
A. endosymbiosis.
B. exocytosis.
C. pinocytosis.
D. mutation.
E. natural selection.
A. endosymbiosis.
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A closed-circular DNA in its relaxed form has a linking number (Lk) of 500 . What will happen to the linking number of this molecule if DNA gyrase and ATP are added to this DNA?
A. Lk will increase. B. Lk will decrease. C. Lk will stay the same. D. Lk becomes undefined. E. None of these choices is correct.
In the central nervous systems, axons of several neurons traveling together are called ____
a. nuclei b. fibers c. bundles d. tracts e. filaments
A(n) ________ [two words] is a novel feature that evolved in a lineage and may be unique to a species or shared among species
Fill in the blank(s) with correct word
Approximately 1 out of every 2,500 Caucasians in the United States is born with the recessive disease cystic fibrosis. According to the Hardy-Weinberg equilibrium equation, approximately what percentage of people are carriers?
a. 2% b. 4% c. 96% d. 10% e. 0.08%