Vaccines are composed of ________ that stimulate an active immunity to the pathogen.
A) memory B cells that respond to a microorganism
B) memory T cells that respond to a microorganism
C) the non-pathogenic portion of the microorganism
D) the pathogenic portion of the microorganism
E) antibodies to a microorganism
Ans: C) the non-pathogenic portion of the microorganism
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A very narrow pedigree, such as that for Egypt's Ptolemy dynasty, reflects
A) families with many adopted children. B) a very mild phenotype. C) many uncles marrying their nephews. D) families with many relatives having children with blood relatives
Which of the following are examples of integrators?
a. brain b. muscles, glands c. sensory cells in the eye, tongue, and ear d. bones e. digestive organs
Which of the following is eliminated in rapidly dividing embryonic cells that get smaller with each cell division?
A) G1 phase B) S phase C) G2 phase D) M-phase chromosome separation E) M-phase cytokinesis
A dance that recruits other bees into foraging 90 degrees to the right of the sun is indicated by flying ____.
A. straight up the comb B. straight down the comb C. to the left of vertical D. to the right of vertical E. in circles