Which of the following describes the specificity of NK and Tc cells?
A) Both are highly specific.
B) Neither is specific.
C) NK cells are nonspecific, but Tc cells are specific.
D) NK cells are specific, but Tc cells are nonspecific.
C
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Designed in the 1950s to discourage internal migration, the Chinese __________ system classifies city dwellers as legal residents or non-residents
Fill in the blank(s) with correct word
If the goal is to minimize the amount of hazardous waste, which of these strategies offers the best chance of achieving this goal?
A. selling hazardous materials as raw materials B. storing wastes in surface impoundments C. injecting liquid waste into deep underground wells D. incineration
Which of the following is NOT a characteristic of rocks with clastic textures?
A. composed of broken fragments of older eroded rocks B. commonly formed in low temperature environments C. composed of interlocking minerals
Earthquakes can result in flooding only when they trigger a tsunami. Indicate whether the statement is true or false