All gills
a. consist of overlapping rows of filaments.
b. are external.
c. are paired.
d. are associated with a blood transport system.
e. fit all of these descriptions.
Answer: d
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B. pertussis colonies growing on Regan-Lowe medium yields which of the following colonial morphologic appearances?
a. Star-shaped colonies b. Mercury-drop colonies c. Yellow-pigmented colonies d. Shiny black-pigmented colonies
Which virus found in the blood involves infecting certain T lymphocytes and possibly macro-phages?
a. Cytomegalovirus (CMV) b. Epstein-Barr virus (EBV) c. Rubella virus d. Human immunodeficiency virus (HIV)
The correct sequence for the stages in development from conception to birth is
A. zygote, embryonic stage, preembryonic stage, fetal stage. B. fetal stage, zygote, preembryonic stage, embryonic stage. C. preembryonic stage, embryonic stage, zygote, fetal stage. D. zygote, preembryonic stage, embryonic stage, fetal stage. E. fetal stage, embryonic stage, preembryonic stage, zygote.
The plant pathogen ________ is a member of the alphaproteobacteria that alters plant cells by introducing DNA into them
A) Azotobacter B) Agrobacterium C) Rhizobium D) Pseudomonas E) Bdellovibrio