In countries that have large numbers of children under age 15, the population is
A) hard to predict.
B) able to expand its carrying capacity.
C) becoming larger.
D) becoming smaller.
E) staying the same.
C
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The evolution of organisms that use oxygen in their respiration was possible only because of the action of a group of bacteria that produced oxygen and changed the Earth's atmosphere from an anoxic one to one rich in oxygen. That group of bacteria was:
A. Cyanobacteria B. spirochaetes C. Proteobacteria D. Staphylococcus E. Actinobacteria
Why doesn't a tapeworm have a mouth on its scolex?
A. The mouth is on the proglottids B. Endoparasites don't need a mouth C. The mouth is located at the end of the pharynx D. Tapeworms use a radula instead of a mouth to feed
________ techniques are based on recreating a microenvironment in the laboratory to promote the growth of a microorganism formerly restricted to a small ecological niche.
A. Enrichment culture B. Fastidious growth C. Community growth D. PCR
In the process of biological evolution, new species may evolve through exchange of genes from one species to another. This process is called
A. proteome transfer. B. vertical descent with mutation. C. genomic sciences. D. horizontal gene transfer. E. vertical evolution.