The refractive index is a measure of how much light is _____ as it enters a material.
What will be an ideal response?
Refracted or bent
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The main signaling cascade for cell division and differentiation is the ____ cascade
a. cAMP b. MAP kinase c. phosphoinositol d. phospholipase C e. calcium-calmodulin
As a naturalist, you are responsible for training volunteers in the identification of the types of amphibians. The volunteers will use this information to correctly describe the animals to school groups that will visit your nature center. The training documentation for the volunteers lists important characteristics of the different groups of amphibian, but you notice that one of the items on the list is incorrect. Indicate which description is not correct.
A. Frogs and toads have external fertilization whereas salamanders and caecilians have internal fertilization. B. Frogs, toads, and most salamanders have four legs whereas caecilians are legless. C. Adult frogs, toads, and salamanders are predators of insects and other small animals whereas caecilians are herbivores. D. Frogs and toads lay eggs whereas some caecilians lay eggs and others give birth to live young. E. Salamanders and caecilians have external tails whereas frogs and toads do not.
Noting that half of a population is between the ages of 7 and 10 illustrates which of the following?
a. an r-selection graph b. a k-selection graph c. an age structure d. a growth curve
Until renamed by Paul Ehrlich in the 1890s, the heat-labile, nonspecific part of the immune system that enhances inflammation was known as "alexin". We now know that various proteins of this system attract neutrophils to tissues, direct phagocytosis of targets by neutrophils and macrophages, burst pathogens by insertion of the membrane attack complex (MAC), stimulate histamine release, and increase capillary permeability. What did Ehrlich rename this part of the immune system?
A. complement B. contingent C. Toll-like response D. acquired immunity E. MBL