The _____ and _____ are unique among vertebrates (or craniates) in that they lack jaws
A. hagfish; lampreys
B. hagfish; cephalochordates
C. cephalochordates; lampreys
D. lampreys; cartilaginous fish
E. none of these
A
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Signal transduction pathways initiate activation of transcription after specific
A) TH cell death. B) ligand-receptor binding on the cell surface. C) cytokines diffuse across the cytoplasmic membrane. D) antigen-antibody binding.
The relatively high percentage of individuals in West Africa who are heterozygous for the sickle cell
trait is an example of _______________. A. natural selection D. heterozygote disadvantage B. genetic drift E. more than one of these C. spontaneous mutational spread
A woman with a beard most likely has a malfunctioning
A. pituitary. B. pancreas. C. adrenal cortex. D. adrenal medulla. E. thyroid.
Cell-mediated immunity is a function of
A. NK cells. B. T lymphocytes. C. B lymphocytes. D. dendritic cells. E. macrophages.