Unlike white blood cells, mature red blood cells lack a(n) ________
Fill in the blank(s) with correct word
nucleus
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What is the correct order of gene expression in the early Drosophila embryo?
A. pair-rule genes, gap genes, segment polarity genes B. gap genes, pair-rule genes, segment polarity genes C. gap genes, segment polarity genes, pair-rule genes D. segment polarity genes, pair-rule genes, gap genes
Which of the following is most likely to occur when a tumor-suppressor gene is mutated?
A. The tumor-suppressor gene may be overactive. B. The resulting tumor-suppressor protein would further suppress cell proliferation. C. The resulting tumor-suppressor protein would activate an oncogene. D. The tumor-suppressor gene and resulting protein may lose its function and ability to suppress cell proliferation. E. None of the choices are possible.
Which layer of arteries and veins is made up of connective tissue and elastic fibers?
a. tunica intima b. tunica media c. tunica externa d. lumen
In _______ mimicry, unprotected species resemble others that are distasteful.
A. Müllerian B. competitive C. Batesian D. aposematic