A major difference between cells of organisms in Domain Eukarya and the cells of those in Domains Bacteria and Archaea is that:
A) Domain Bacteria and Archaea cells can only live in acid environments.
B) cells of Domain Eukarya have a nucleus and Domains Bacteria and Archaea do not.
C) Domain Eukarya organisms can only live in acid environments.
D) Domain Bacteria and Archaea cells have a nucleus and Domain Eukarya cells do not.
Answer: B
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Some microbial proteins are spliced after translation in a reaction that results in removal of one or more internal intervening sequences called exteins.
Answer the following statement true (T) or false (F)
The systematics of today is very different from the systematics learned a generation ago. As a result, which statements
is the least accurate?
a. The biological species concept has no validity. b. The number of existing species is known with certainty. c. The Linnaean system of classification is wrong most of the time. d. Morphological traits are not reliable for determining species relationships. e. Evolutionary-based classification has entirely re-organized the classification and categories of organisms and their relationships to one another.
"I bands" in skeletal muscle are composed of
a. discs to which thin filaments are anchored. b. stacked thick filaments along with parts of thin filaments that overlap both ends. c. thin filaments but no thick filaments. d. thick filaments but no thin filaments. e. discs to which thick filaments are anchored.
Which is not a component of nucleic acids?
A. sulfur B. pentose sugar C. organic nitrogenous base D. phosphate