The photoreceptors are most tightly packed into a specific part of the retina called the ________
A) fovea B) ciliary body C) choroid D) optic nerve
Answer: A
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A distinctive type of larva shared by several phyla of invertebrates and considered to be important in phylogeny is the:
A. trochophore B. paedomorph C. gastrula D. metamere E. tadpole
Which event of fertilization occurs first?
A. fast block to polyspermy B. the entry of sperm DNA into the egg C. the slow block to polyspermy D. the acrosomal reaction E. the cortical reaction
Which of these characteristics first developed in reptiles?
A. skull and vertebral column B. animals living completely on land C. scales on skin D. amniotic egg E. four-legged body
The difference between T cell activation by normal antigens and T cell activation by superantigens is that superantigens
A) suppress cytokine release. B) are not processed and presented by APCs. C) are not processed and presented by APCs and cause nonspecific activation of many T cells at once, including those that would not normally recognize the antigen. D) cause nonspecific activation of many T cells at once, including those that would not normally recognize the antigen and suppress cytokine release. E) cause nonspecific activation of many T cells at once, including those that would not normally recognize the antigen.