John and all his brothers have no antibodies caused by non-functional B cells. Therefore, they are highly susceptible to bacterial infections. John and his brothers most likely have a condition called ____________________
Fill in the blank(s) with correct word
X-linked agammaglobulinema
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In the abyssal zone, which of the following serve as the base of the food chain?
a. chemosynthetic bacteria b. photosynthetic organisms c. phytoplankton d. zooplankton
Haustoria are a feature of some pathogenic (algae/fungi/protozoa)
What will be an ideal response?
A mutation in the bicoid gene of Drosophila generates embryos with two posterior regions. What is the likely aspect of embryonic development that the bicoid gene probably controls?
Molecular techniques led to the reinterpretation of morphologically based phylogeny such that
A. echinoderms and chordates were placed in entirely different clades. B. rotifers and nematodes were designated as closely related. C. annelids and arthropods were designated as closely related. D. Bilateria was designated as a monophyletic group. E. Ecdysozoa and Lophotrochozoa were designated as clades.