The time it takes for half of a radioisotope’s atoms to
decay
a. cannot be calculated.
b. is used to construct the geologic time scale.
c. is its half-life.
d. is the same for uranium 238 and carbon 14.
e. is all of these.
Answer: c
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Density-dependent mortality describes a situation in which:
A. seedlings of common species are less likely to be eaten. B. seedlings of rare species are more likely to be eaten. C. seedlings of rare species are more likely to be infected by pathogens. D. seedlings of common species are more likely to be infected by pathogens. E. seedlings have an equal chance of being infected or eaten regardless of density.
Which isolation technique is most effective for the majority of applications and is most commonly used for colony isolation in the laboratory?
A. Pour plate B. Culture plate C. Loop dilution D. Spread plate E. Streak plate
________ is the process that a cell can use to bring very large molecules into the cell
Fill in the blank(s) with correct word
Which of the following statements is true of bacterial plasmids?
A. They are always found in the nucleoid. B. They can replicate autonomously. C. They carry genes for essential metabolic functions. D. They are small circular DNA molecules. E. They are small circular DNA molecules that can replicate autonomously.