According to the endosymbiotic theory, the _____ were originally photosynthetic bacteria.
a. ribosomes
b. mitochondria
c. chloroplasts
d. nucleus
b. mitochondria
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An elephant has a higher total resting metabolic rate than a mouse
A. true B. false
A NASA probe returned samples of rocks from the surface of Mars. From these rocks, a prokaryotic organism was isolated and remained viable under conditions similar to that of Mars. The organisms are capable of dividing to replicate themselves. In order to determine whether the DNA replication of these organisms was semiconservative, an experiment using N15/N14 (similar to that of Mendelson and
Stahl) was performed. If the method of DNA replication were conservative, after one generation one would expect to see A) all of the DNA in the heavy (N15) band. B) all of the DNA in the light (N14) band. C) all of the DNA at a point midway between the heavy and light bands. D) half of the DNA in the light band, the other half in the heavy band. E) none of the above
Which was first on the planet, prokaryotes or eukaryotes?
A. Eukaryotes B. Prokaryotes C. They both appear in the fossil record at about the same time. D. Researchers do not know which group came first
Humans ventilate their lungs by negative pressure breathing
Indicate whether the statement is true or false.