The existence of MZ twin pairs in which only one has autism suggests that
A) some MZ twins are really dizygotic.
B) the environment contributes to autism.
C) twins cannot become autistic.
D) genes do not contribute to causing autism.
B) the environment contributes to autism.
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Our species is called Homo sapiens. The first word refers to which taxonomical grouping?
A. Kingdom. B. Phylum. C. Order. D. Genus. E. Species.
The presence of ________ indicates that the air is healthy for humans to breathe.
A. yeast B. morels C. smuts D. ergot E. lichens
The Greek root words meaning "together" and "fatherland" are the basis for the term
A. adaptive radiation. B. allopatric. C. sympatric. D. speciation. E. prezygotic.
What is a pyrimidine dimer?
A) A hydrogen bond between adjacent pyrimidines B) An electrostatic bond between adjacent pyrimidines C) An ionic bond between adjacent pyrimidines D) A covalent bond between adjacent pyrimidines