Which pair matches the correct macromolecule with the bond that joins its subunits?
a. polysaccharide?peptide bond
b. triacylglycerol?glycosidic linkage
c. nucleic acid?phosphodiester linkage
d. protein?ester linkage
e. steroid?peptide bond
C
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What term describes all alleles of all the genes in a population?
a. genome tree b. genetic family c. gene reservoir d. gene pool e. allele collection
The original source of genetic variation that serves as the raw material for natural selection is ________
A) mutation B) gene flow C) geographic isolation D) random fertilization
Why is the innervation ratio in the ocular muscles one motor axon per 23 muscle fibers, whereas in the gastrocnemius muscle, it is one motor axon per 1,000 muscle fibers?
A. The ocular muscles require finer control than moving the legs. B. The innervation ratio has to do with the overall size of the muscle-the bigger the muscle, the fewer the muscle fibers per motor axon. C. The gastrocnemius muscle contracts much harder than the ocular muscles do. D. There are fewer muscle fibers in the gastrocnemius muscle than in the ocular muscles. E. There are more nerves in the upper body than in the lower extremities.
The simplest nervous system found in nature is the nerve net. An example of an organism that senses and responds to its environment with this ancient system would be
A. a fiddler crab. B. a frog. C. a jellyfish. D. a cockroach. E. an earthworm.