In myelinated axons, ions can diffuse the axon only at nodes of Ranvier.
A. potassium; into
B. sodium; into
C. sodium; out of
D. potassium; out of
E. All of the answer choices are correct.
B. sodium; into
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A bundle of ____ extends from the base to the tip of a flagellum or cilium
a. microtubules b. microfilaments c. actin d. cytokeratin e. intermediate filaments
Which of the following blood cells are derived from megakaryocytes?
a. red blood cells b. monocytes c. platelets d. neutrophils
Which of the following example of a zombie parasite does not "zombify" multiple hosts in its life cycle?
A. Ophiocordyceps B. Toxoplasma gondii C. Green-banded broodsac D. Trypanosoma brucei
Keratins, neurofilaments, and vimentins are all categories of intermediate filaments. Which of the following properties is not true of these types of intermediate filaments?
(a) They strengthen cells against mechanical stress. (b) Dimers associate by noncovalent bonding to form a tetramer. (c) They are found in the cytoplasm. (d) Phosphorylation causes disassembly during every mitotic cycle.