A research laboratory is attempting to collect the content of human red blood cells. The type of solution researchers should use to cause blood cells to lyse (burst) would be
A. isosmotic.
B. osmotic.
C. hypoosmotic.
D. hyperosmotic.
Answer: C
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Normal cell functions of noneukaryotes are disrupted by
A. enzymes. B. mitochondria. C. antibacterial antibiotics. D. cell walls.
Based on modern molecular phylogeny, which animal taxon has members with radial symmetry?
a. Ecdysozoa b. Deuterostomia c. Radiata d. Protostomia
Which of the following is not true of heterochromatin?
a. It is highly condensed chromatin. b. There are two forms of it, called constitutive and facultative heterochromatin. c. It is transcriptionally active. d. It is largely localized to the nuclear periphery.
Scientific work involves ______________________________.
A. the natural and supernatural world B. retesting theories frequently for verification C. proving theories with absolute certainty D. testing hypotheses under every possible circumstance E. coming up with the best objective descriptions of reality