Oxygen produced by photosynthesis comes directly from:a
light.
b. CO2.
c. glucose.
d. H2O.
e. ATP.
D
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Genetic exchange between 2 homologous chromosomes is called
A. synapsis. B. pleiotropy. C. crossing over. D. allelic exchange. E. independent assortment.
In Bacteria, a chromosome can be distinguished from a plasmid, because a chromosome is a genetic element that
A) is circular. B) is linear. C) encodes for essential functional genes. D) replicates via a bidirectional fork.
The ectosymbionts of ruminant animals are useful to their hosts in which of the following ways?
A. They convert glucose to organic acids. B. They produce most of the vitamins needed by the ruminant. C. They digest the cellulose of plant cell walls. D. All of the choices are correct.
The key specializations that occurred in the evolution of mammals include all of the following except
A. digestive tract specialization. B. different teeth suited to their diet. C. warm-bloodedness. D. reduction in brain size. E. the presence of a placenta in most.