Lymphocytes are comprised of which of the following cell types?
A. T cells
B. NK cells
C. B cells
D. All of the choices are correct.
E. T cells and B cells only
Answer: D
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After a young woman suffered a traumatic brain injury, she seemed clumsy and out-of-sorts. She was given a visual acuity test (the assessment for glasses) and general eye health exam, and her eyes were deemed healthy. Would these assessments be adequate to rule out any visual impairment resulting from the brain trauma?
_____ Yes, her clumsiness is more likely attributable to inner ear damage. _____ No, a neurological examination of her visual processing pathways would be necessary.
Which of the following does not occur?
a) radially symmetrical diploblast b) diploblastic eucoelomate c) protostomic coelomate d) bilaterally symmetrical deuterostome
In many dicots, the first pair of leaves to emerge from the soil after seed germination is completely unlike all the rest of the leaves that form on that plant. In such plants, these leaves are
A) formed from the endosperm. B) cotyledons, which have elongated and turned green. C) made from the epicotyl hook. D) derived from the root, not the shoot. E) made from the opening and greening of the coleoptile.
A particular segment formed during normal Drosophila development
A. can form different structures, depending on positional information received by the segment during early development. B. will express different transcription factors in different individuals. C. will always form the same structures in adult flies. D. is only important to early developmental stages. E. will become ectoderm, endoderm, or mesoderm.