How is an adaptive defense initially primed?
A) Upon exposure to a foreign antigen
B) Complement proteins identify a cell as foreign
C) Antibodies bind to surface markers of a foreign cell
D) By way of the clonal selection of effector cells
A
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Which of the following are specialized cells that receive and transmit chemical and electrical signals?
a. glial cells b. dendritic cells c. neuron cells d. axon cells
Answer the following statements true (T) or false (F)
1.Lichens and mosses that can grow on and erode rock would be considered pioneer species. 2.All communities eventually reach the climax state, in which all components are consistent. 3.Energy is constantly being recycled within an ecosystem. 4.Raw sewage within a water ecosystem can kill fish because respiration by the microbes in the sewage reduces the concentration of oxygen within the water. 5.In a process called denitrification, bacteria convert NO – to N .
Detergents are best able to dissolve oil from fabric or dishes during washing because
A) the positively charged end is associated with water molecules, while the negatively charged end interacts with the oil droplet. B) the negatively charged end is associated with water molecules, while the positively charged end interacts with the oil droplet. C) the nonpolar end is associated with water molecules, while the charged end interacts with the oil droplet. D) the charged end is associated with water molecules, while the nonpolar end interacts with the oil droplet. E) detergents are nonpolar, they increase the size of the oil droplet, allowing the water to be more effective at removing the oil.
Hyphae are divided into cells by ________
Fill in the blank(s) with correct word