A requirement of cladistics is that a grouping must include ________.

A. a common ancestor and all its descendants
B. species that can interbreed
C. species with shared traits
D. only living species


Answer: A

Biology & Microbiology

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Which of the following is not true of the imprinting of the mammalian gene for insulin growth factor-2 (IGF-2)?

A. CTCF binds to the methylated IGF2 gene insulator. B. IGF2 gene is activated when the insulator is methylated. C. The maternally inherited copy of IGF2 is normally repressed in egg cells. D. The insulator of both the paternal and maternal IGF2 alleles lies between the promoter and the enhancer.

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The situation in which some offspring are haploid and others diploid is referred to

A. eusociality. B. viviparity. C. haplodiploidy. D. didiploidy. E. dihaploidy.

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Blood usually continues on from capillaries to

enter ____ in its travel through the human body. a. arterioles b. venules c. arteries d. veins e. other capillaries

Biology & Microbiology

The simultaneous use of both organic and inorganic forms of carbon is called ________.

A. metatrophy B. osmotrophy C. omnitrophy D. mixotrophy

Biology & Microbiology