Quorum sensing ________.
A. depends on the sensing of signal protein molecules
B. plays an important role in formation of biofilms by Pseudomonas aeruginosa
C. is a phenomenon in which bacteria monitor their own population density
D. All of the choices are correct.
Answer: D
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Peptide hormones and growth factors act on target cells by binding to cell surface and _______ receptors.
a. endoplasmic reticulum b. cytosolic c. nuclear d. soluble extracellular
Which of the following correctly describes components of the extracellular matrix and associated cells?
a. Proteoglycans are a component of connective tissues but are relatively unimportant in watery tissues (such as the interior of the eye.) b. Integrins can be activated only from signaling inside of a cell. c. Integrins can attach directly to collagen fibers in the extracellular matrix. d. Fibroblasts secrete collagen and form it into specific shaped structures.
The excretory structures of terrestrial arthropods are slender projections from the digestive tract that are attached at the junction of the midgut and hindgut. These are called
A. flame cells. B. Malpighian tubules. C. ocelli. D. kidneys and bladders. E. nephridia.
All forms of typhus are associated with arthropod vectors
Indicate whether the statement is true or false