One hypothesis about the decline in cell numbers during death phase is that the cells aren't all dying but instead remain alive but unable to grow when cultured, at least temporarily. These are known as
A. death phase cells.
B. ghost cells.
C. programmed death cells.
D. viable but nonculturable cells.
Answer: D
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Arroworms seize their prey with:
a. tetrodotoxin. b. stinging cells. c. engulfing with their mouth. d. oral tentacles. e. grasping spines.
The small circular molecules of DNA in bacteria are known as ____
a. plasmids b. desmids c. primers d. clones e. microparticles
To measure the population of lake trout in a 250 hectare lake, 200 individuals were netted and marked with a fin clip, and then returned to the lake. The next week, the lake is netted again, and out of the 200 lake trout that are caught, 50 have fin clips. Using the capture-recapture estimate, the lake trout population size could be closest to which of the following?
A) 200 B) 250 C) 400 D) 800 E) 40,000
Genetic sequence data from mitochondrial and Y chromosome DNA agree that the human family is _____ and it arose _____
A. young; in Africa B. young; in Europe C. old; in Africa D. old; in Europe E. old; in many regions around the world