Autoimmune disorders are caused by
a. lymphocytes and antibody molecules
attacking self cells instead of only foreign
cells.
b. B cell activation.
c. impaired innate immunity function.
d. T cell activation.
e. the inability to make antibodies
A
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Histone modification:
A. is fixed; once a histone is modified, it stays that way and the genes with which it is associated are turned on or off permanently. B. is fixed, but this has no effect on whether genes are expressed. C. is randomâ€"sometimes the lysines are modified and sometimes they're not, but the state is independent of the environment or cell type. D. can change over time in response to environmental cues, allowing genes to be turned on or off as needed. E. can change over time in response to environmental cues, but this has no effect on gene expression.
Rhizomes, tubers, corms, and stolons are examples of modified
a. leaves. b. bulbs. c. roots. d. flowers. e. stems.
Which components of an atom do not have a
charge? I. electrons II. protons III. neutrons a. I only b. II only c. III only d. I and II e. II and III
Your job is to classify a newly discovered animal species. Your initial studies reveal that your specimen has tissues, organs, a head, and a pseudocoelom; has no segmentation; and has bilateral symmetry. To what phylum does this animal belong?
A) Annelida B) Cnidaria C) Nematoda D) Platyhelminthes E) Mollusca