Which type of signaling regulates the pain response?
a. endocrine
b. paracrine
c. autocrine
d. direct signal across gap junctions
c. autocrine
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Why would the presence of a specific type of keratin, an intermediate filament protein, in the bloodstream or lymph node be an indicator of metastasis of tumor cells?
A. Intermediate filaments are only found in tumor cells. B. Keratin is only present if its specific cell type is also present. C. Intermediate filament proteins cause cells to clump together. D. Answers b and c are both correct.
_____ is the process in which two groups of organisms living in the same habitat diverge into separate species
A. allopatric speciation B. peripatric speciation C. adaptive radiation D. co-speciation E. sympatric speciation
Which one of the following statements is TRUE regarding bone?
A) The epiphysis of a long bone is filled with yellow bone marrow. B) Bone is not considered to be a living tissue because it does not contain cells or blood vessels. C) Dense compact bone is located in the center of a long bone. D) Stem cells responsible for the production of blood cells are located in red bone marrow. E) The outer surface of a bone is covered with loose connective tissue.
Ionic bonds
A) are electrostatic forces of attraction between oppositely charged ions and form when electrons are transferred from atom to another. B) form when electrons are transferred from atom to another and only exist as ions in solution. C) are electrostatic forces of attraction between oppositely charged ions. D) only exist as ions in solution. E) form when electrons are transferred from atom to another.