Secretory IgA antibodies are unique because they
A) have unique light chains.
B) are Y-shaped molecules.
C) are present in the plasma.
D) are connected with J chains and short polypeptides to form dimers.
E) are present in lymph nodes.
D
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Referring to Figure 5-21, which of the following modifications requires ATP?
A. methylation B. ubiquitination C. myristoylation D. acetylation E. adenylylation
The hypothesis that mitochondria and chloroplasts originated from the phagocytic activity of prokaryotes that was not
followed by digestion is called the ____.
a. theory of natural selection b. endosymbiotic hypothesis c. ribozymes-first hypothesis d. Oparin-Haldane hypothesis e. stromatolite hypothesis
All of the varied sensations we experience are due to which three categories of sensory receptors?
A. visioceptor, audioceptor, olfactoceptor B. exteroceptor, interoceptor, proprioceptor C. mechanoreceptor, chemoreceptor, electromagnetic receptor D. mechanoreceptor, olfactory receptor, photoreceptor E. mechanoreceptor, chemoreceptor, nociceptor
In what ways do exotoxins usuall affect host cells?
a. Digesting intracellular fibers b. disrupting intracellular function c. causing lysis of cell d. dissolving the cell cement e. damaging the cell membrane