The squid served as an ideal model system to study neurophysiology because
A) Squids are invertebrates and invertebrates have a simpler nervous system than vertebrates.
B) The large diameter of the squid's neurons enabled researchers to make recordings from inside of a nerve cell.
C) Fast electrical communication is a unique feature of squids.
D) Squids are active predators and therefore have many nerves that can be easily studied.
Answer: B
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The genotypes and phenotypes that result from the cross of Aa and Aa (A = normal pigmentation and a = albinism) are
A. phenotypes:25% normal and 75% albino; genotypes:25% homozygous dominant and 50% heterozygous and 25% homozygous recessive. B. phenotypes:50% normal and 50% albino; genotypes:all homozygous recessive. C. phenotypes:75% normal and 25% albino; genotypes:25% homozygous dominant and 50% heterozygous and 25% homozygous recessive. D. phenotypes:50% normal and 50% albino; genotypes:50% homozygous recessive and 50% homozygous dominant.
Identify the protein-hydrolyzing enzymes in the digestive tract, and name their sources. Why are these enzymes released in an inactive form?
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After causing vibrations of the maleus, sound waves pass (in sequence) through the
A. stapes, round window, scala externa perilymph, scala media endolymph, and oval window. B. incus, stapes, oval window, scala vestibuli perilymph, and cochlear duct endolymph. C. oval window, scala tympani perilymph, scala vestibuli endolymph, and spiral organ. D. incus, stapes, oval window, scala tympani endolymph, scala vestibuli, and helicotrema. E. stapes, incus, round window, scala media perilymph, and scala vestibuli endolymph.
An increase of blood volume will cause secretion of ADH.
Answer the following statement true (T) or false (F)