Who found and named Pithecanthropus?
A. Ernst Haeckel
B. Eugene Dubois
C. Rudolf Virchow
D. Davidson Black
E. G. Elliot Smith
Answer: B. Eugene Dubois
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How does the antiparallel polarity of DNA strands contribute most to the integrity of genetic information?
A) A DNA double helix cannot be broken or degraded. B) The antiparallel polarity of the strands means that replication occurs more quickly, decreasing the likelihood of DNA damage. C) Hydrogen bonding between strands is very stable, so DNA bases cannot be not damaged by environmental agents. D) Both antiparallel strands can be replicated continuously, which is more accurate than discontinuous replication. E) Each antiparallel strand can serve as a template to produce the other strand in the event of DNA damage.
In genomic libraries:
a. naturally and arti?cially selected plants are genetically engineered. b. DNA fragments are stored in plasmids. c. a virus is used to transform human cells. d. none of the above are done.
Penicillin is an antibiotic that inhibits enzymes from catalyzing the synthesis of peptidoglycan, so which prokaryotes should be most vulnerable to inhibition by penicillin?
a) gram-positive bacteria b) archaea c) mycoplasmas d) gram-negative bacteria e) endospore-bearing bacteria
The electrical signal for a muscle to contract passes rapidly from one cell to the next via
A) gap junctions. B) desmosomes. C) plasmodesmata. D) tight junctions. E) internal proteins.