Down syndrome (trisomy-21 ) results from ________
A) a sex-linked mutation
B) an autosomal recessive allele
C) a teratogen
D) nondisjunction
E) a mutagen
D
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Human intelligence is most closely related to the
A. amount of cerebrospinal fluid. B. number of active synapses. C. number of neurons. D. size of the brain. E. weight of the brain.
Which animal group is NOT considered ammoniotelic?
A) Mammals B) Agnathans C) Aquatic mollusks D) Chondrichthians
Cations will ________ each other.
A) attract B) not react with C) repel
Which two arteries arise from the right coronary artery?
A) the right anterior interventricular artery and the left posterior interventricular artery B) the left marginal artery and the right circumflex artery C) the right marginal artery and the right posterior interventricular artery D) the right anterior interventricular artery and the right circumflex artery