La palabra antígeno es cualquier sustancia extraña a un organismo que, al ser introducida en él, provoca una respuesta inmunitaria. La anterior afirmación es verdadera porque * A. se estimula la producción de anticuerpos que reaccionan específicamente contra dicho antígeno.

B. los antígenos suelen ser moléculas muy grandes y pueden ser atacados con facilidad.

C. los linfocitos T maduran en el timo y son los responsables de la respuesta inmune bacterial.

D. se genera inflamación en la región afectada, aislando el patógeno y permitiendo la acción de los anticuerpos.

In german cockroaches, curved wing (cv) is recessive to normal wing (cv+). bill, who is raising cockroaches in his dorm room, finds that the frequency of the gene for curved wings in his cockroach population is 0.6. in his friend joe’s apartment, the frequency of the gene for curved wings is 0.2. one day joe visits bill in his dorm room, and several cockroaches jump out of joe’s hair and join the population in bill’s room. bill estimates that, now, 10% of the cockroaches in his dorm room are individual roaches that jumped out of joe’s hair. what is the new frequency of curved wings among cockroaches in bill’s room? 0.69 0.4 0.5 0.31 0.20

Which strategy is an example of how companies may upgrade themselves to meet changing customer preferences? a.doing door-to-door sellingb.using billboards to advertise the productsc. making online shopping services availabled.giving discounts on products

Which would best keep the oxygen cycle stable? a. cutting down jungles to create farmland b. eliminating parks in large cities c. dumping toxic chemicals into the ocean d. reducing the amount of deforestation d. reducing the amount of deforestation