All vertebrates have
a. two nerve cords.
b. a nerve cord in the front of the body.
c. a nerve cord on the side of the body.
d. a hollow dorsal nerve cord.
e. a tubular ventral nerve cord.
Answer: d
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Linnaeus sorted animals into groups based on body plans. Today, these groupings are called:
A. families. B. branches on the phylogenetic tree. C. phyla.
Rising intracellular levels of which ion are necessary for neurotransmitter release from a neuron?
A. K+ B. Cl- C. Mg2+ D. HCO3- E. Ca2+
If a pedigree of several generations shows only females affected by a particular trait, it cannot be a(n) ____ trait
a. autosomal recessive b. autosomal dominant c. Y-linked d. X-linked recessive e. X-linked dominant
Refer to Figure 50-2. If a cut was made between numbers 6 and 10:
a. seminal fluid would not be produced. b. sperm cells would not be produced. c. sperm maturation would be inhibited. d. the seminal vesicles and the testes would be below the cut. e. None of these.