Trypan blue is
(a) taken up by living cells.
(b) taken up by dead cells.
(c) taken up by both living and dead cells.
(d) used to identify plant cells.
(b) taken up by dead cells.
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The evolution of insect wing patterns is best explained by
A. a new gene mutation. B. the modification of an existing gene for a new function. C. homoplastic convergence. D. gene duplication and divergence. E. conserved genes.
A scientist does not have an antibody to detect the protein of interest, but wants to know if the gene is expressed at low levels. What technique could the researcher use to detect, but not quantify the expression of the gene of interest?
A. Western Blotting B. real-time PCR C. cloning D. reverse transcriptase PCR
The ____ system is responsible for mineral storage in the body
a. circulatory
b. digestive c. respiratory d. skeletal e. urinary
All of the following are characteristic of lichens EXCEPT
A) they are arranged in foliose, fruticose, or crustose morphologies. B) they are a major food source for tundra herbivores. C) they are used as indicators of air pollution. D) they are a symbiotic relationship between a fungus and a protozoan. E) they serve as primary producers in rocky ecosystems.