Aphids are small insects that suck sugars from the phloem of plants. The ecological relationship between plants and aphids is:
A. mutualism.
B. parasitism.
C. competition.
D. None of the responses is correct.
B
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What is the structural feature that allows DNA to replicate?
A) sugar-phosphate backbone B) complementary pairing of the nitrogenous bases C) disulfide bonding (bridging) of the two helixes D) twisting of the molecule to form an ?-helix E) three-component structure of the nucleotides
DNA polymerase III is the main replication enzyme in prokaryotes. What is it in eukaryotes?
A. DNA pol a B. DNA pol d C. DNA pol b D. DNA pol g
Of the clinically significant Bartonella species, which is transmitted via a fleabite with the reservoir being rats?
a. B. bacilliformis b. B. henselae c. B. elizabethae d. B. clarridgeiae
In a patient who is exhibiting signs of graft-versus-host disease, which cell type is most likely responsible for the reaction?
A. B cells B. T cells C. Macrophages D. Eosinophils