To express a gene, DNA is first transcribed into a corresponding strand of
A) mtDNA.
B) rRNA.
C) mRNA.
D) tRNA.
C) mRNA.
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Darwin made which of the following observations during his journey aboard the HMS Beagle?
A. Although Galápagos finches had different physical attributes, they resembled mainland finches in Ecuador. B. The largest and most fit organisms tended to have a higher rate of survival. C. Galápagos finch populations were growing faster than the available food supply. D. In Argentina, extant glyptodonts closely resembled extinct armadillos, only the armadillos were much larger.
Speciation without geographic isolation is called:
a. sympatric speciation. b. parapatric speciation. c. saintpatric speciation. d. autopatric speciation. e. allopatric speciation
Compare and contrast endotoxins and exotoxins
What will be an ideal response?
Organisms that are damaged by the normal atmospheric levels of oxygen (20%) but require oxygen at levels of 2-10% for growth are called ________.
A. facultative anaerobes B. microaerophiles C. aerotolerant D. anoxygenic