the illustration above to answer questions 16–19
E 16. Which structure is a dorsal,hollow nerve tube?
a. A
b. B
c. C
d. A and B
e. none of these
Answer: b
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In the gene that affects snail coiling, the ______ is responsible for the phenotype of the offspring
A. mother's phenotype B. father's phenotype C. mother's genotype D. father's genotype
Hydrophobic messengers include which of the following?
A) retinoids B) cAMP C) pertussis toxin D) calcium ions E) ryanodine
Hereditary nonpolyposis colon cancers (HNPCC) ____
a. are rare in the United States, but common in Europe b. begin with a mutation in the APC gene c. are caused by one-of-a-kind DNA sequences called microsatellites d. are caused by one mutation in a single gene e. are caused by several mutations in several different genes
A reproductive strategy in which one individual has both testes and ovaries is called
A. hermaphroditism. B. sexual reproduction. C. parthenogenesis. D. fission.