Select all of the following that are true about the chondrichthyans.
_____ They have internal fertilization.
_____ They were the first fish to develop teeth.
_____ Their buoyance is maintained by oil.
_____ They are known for acute color vision.
_____ Their teeth are composed of dentin and enamel.
__X__ They have internal fertilization.
__X__ They were the first fish to develop teeth.
__X__ Their buoyance is maintained by oil.
_____ They are known for acute color vision.
__X__ Their teeth are composed of dentin and enamel.
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The base found in DNA, but not RNA, is ____________________; the base found in RNA, but not
DNA, is ____________________. Fill in the blank(s) with the appropriate word(s).
vWhich of the following nitrogenous bases is usually found in RNA but not in DNA?
A. Guanine B. Thymine C. Uracil D. Adenine
A fetus is born with cardiac defects, CNS malformations, microtia, and thymic hypoplasia. The fetus was exposed in utero to which of the following drugs?
A. Cocaine B. Isotretinoin C. Thalidomide D. Tobacco E. Valproic Acid
What organization oversees the cleanup of hazardous waste sites in the United States?
A. USDA B. NIH C. EPA D. USGS E. NSF