Placing celery sticks in fresh water will make them more turgid and harder. This is because
A. salt moves from the water into the celery sticks.
B. the celery is hypotonic to fresh water.
C. the celery is hypertonic to fresh water.
D. water moves from the celery sticks into fresh water.
E. the celery is isotonic to fresh water.
Answer: C
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A. The test group does not know whether they are receiving a placebo or the actual treatment, but the researchers do. B. Neither the test group nor the researchers know whether the test group is receiving a placebo or the actual treatment until all the data are collected. C. The test group knows whether they are receiving a placebo or the actual treatment, but the researchers do not know until all the data are collected. D. The test group knows whether they are receiving a placebo or the actual treatment, and so do the researchers.
Which feature(s) differentiate(s) Actinobacteria from Firmicutes?
A) absence/presence of a cell wall B) endospore production capability C) motility and chemotaxis abilities D) relative G+C content in their genomes
In humans, the blastocyst develops about ___
days after fertilization.
a. 1 b. 3 c. 5 d. 7 e. 9
An enzyme is about the same as a(n)
A. catalyst. B. inhibitor. C. substrate. D. end product.