Polychaetes crawl by means of leg-like ________ which also serve in respiration.
a. Aortic arches
b. Metanephridia
c. Clitella
d. Palps
e. Parapodia
Answer: e. Parapodia
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Many pharmaceutical drugs specifically inhibit transcription in Bacteria but not Archaea or Eukarya. Why would drugs that inhibit transcription only affect Bacteria and not Archaea even though they are both prokaryotes?
A) Archaea and Eukarya have very similar ribosomes that are different than bacterial ribosomes. B) Bacteria lack a nucleus. C) Archaea lack operons. D) Archaea and Eukarya have very similar RNA polymerases that are different than bacterial RNA polymerases.
During a dive, a marine mammal experiences an increase in the partial pressure of dissolved gases of about 1
atmosphere for every ____ meter(s) in depth
a. 1 b. 5 c. 10 d. 15 e. 20
X-ray data showed that the DNA helix undergoes one complete turn every
A) 2.0 angstroms. B) 3.4 angstroms. C) 20 angstroms. D) 34 angstroms.
Under the Articles of Confederation, the years between 1781 and 1787 are often referred to as the ³critical period ´ because the
A: colonies were forced to pay high reparations to England B: states were fighting the French and Indian War C: southern states threatened to secede from the Union over the issue of slavery D: central government lacked the power to deal with major problems