The scanning electron microscope cannot take precise measurements of elemental concentrations in glass fragments because of the ______ of the glass fragments.
What will be an ideal response?
Irregular shape
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Introns in pre-mRNA are known to:
a. code for specific protein domains. b. undergo excision, whereby they are spliced out of the message. c. be able to move within the mRNA, thereby giving rise to new exon combinations. d. protect pre mRNA from enzyme degradation. e. code for important amino acid sequences.
When two species are harmed, it's called
A. mutualism. B. commensalism. C. competition. D. predation.
Worldwide, the primary method of transmission of HIV is
A) heterosexual intercourse. B) homosexual intercourse. C) intravenous drug use. D) blood transfusions. E) nosocomial.
Dandelions, Taraxacum officinale, are plants that produce fruitlike propagules that are actually produced asexually. Sexual reproduction is very rare in this organism. Which species concept would be least useful in defining dandelions as a species?
A. Phylogenetic species concept. B. Biological species concept. C. Evolutionary species concept. D. Ecological species concept. E. Both the evolutionary and ecological species concepts.