Which of the following is an acid?
A. NaOH
B. HOH
C. H2SO4
D. NaCl
C. H2SO4
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Freshwater flatworms have this type of system for osmoregulation.
A. protonephridial B. metanephridial C. osmonephridial D. eunephridial E. isonephridial
The drug ________ is added to mouse cell cultures to select against transformants that do not have the desired gene knockout
A) ampicillin B) kanamycin C) neomycin D) G418 E) ganciclovir
What is the thin barrier (0.2 !m) that allows for the efficient exchange of gases between the lungs and the blood called?
A) endothelial cell B) type I alveolar cell C) type II alveolar cell D) respiratory membrane E) alveolar macrophage
The wood of gymnosperms is composed of ______________, and the wood of angiosperms (e.g., a cherry blossom) can consist of ______________________
A. tracheids; fibers and vessel elements B. fibers and tracheids; vessel elements C. vessel elements and fibers; tracheids D. tracheids and vessel elements; fibers