How are negative stains different from other types of stains?
a. They stain the desired structure or specimen black.
b. They stain more than one type of specimen.
c. They stain the background, leaving the cells colorless.
Answer: c. They stain the background, leaving the cells colorless.
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An insecticidal protein has been discovered in a bacterium known as
A. Escherichia coli. B. Agrobacterium tumefaciens. C. Bacillus thuringiensis. D. Aspergillus sp.
While neural activity involves transmission of information through electrical events, endocrine activity involves ____
a. transport of hormones to trigger slow, persistent responses b. transport of hormones to trigger fast, transient responses c. release of hormones from exocrine glands for transport outside the body d. changes in neural activity for transport of hormones to target tissues e. transmission of information through chemical reactions
Strands of DNA joined by Strands of DNA are joined by
a) hydrogen bonds. b) covalent bonds. c) ionic bonds. d) phosphodiester bonds.
The Monteverde Cloud Forest in Costa Rica is an example of a ____.
A. national park B. nearly extinct ecosystem C. restored ecosystem D. government nature reserve E. private nature reserve