The direct effect more commonly occurs than the indirect effect.
a. true
b. false
Ans: b. false
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During an infection, lymph nodes swell because ________ cells accumulate inside them
a. natural killer (NK) cells b. B c. T d. mast
Carbon-12 is the most common isotope of carbon and has a mass number of 12. However, the average atomic mass of carbon found on a periodic table is slightly more than 12 daltons. Why?
A) The atomic mass does not include the mass of electrons. B) Some carbon atoms in nature have an extra proton. C) Some carbon atoms in nature have more neutrons. D) Some carbon atoms in nature have a different valence electron distribution.
The best definition of population density is:
a. the number of individuals of all species in a given area. b. the number of individuals of one species in a given area. c. the number of individuals in a given area at a given time. d. the number of individuals of all species in a given area at a given time. e. the number of individuals of one species in a given area at a given time.
Enzymes are specialized ________ that catalyze chemical reactions within the body
A) nucleic acids B) carbohydrates C) lipids D) proteins