The nitrogenous base that is only found in RNA and not DNA is:
A. adenine
B. cytosine
C. uracil
D. guanine
E. thymine
C
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Traditional and molecular phylogenies disagree on which one of the following issues?
A. whether or not the Eumetazoa are monophyletic B. whether the Bilateria and Radiata split early into separate monophyletic clades C. whether the split between Parazoa and Eumetazoa occurred at a very early stage in animal evolution D. whether Echinodermata and Chordata are both deuterostomes E. whether the appearance and type of coelom is important in interpreting phylogeny
The opposite results obtained by scientists apparently doing the same experiments in investigating spontaneous generation
A. shows the importance of repeating experiments. B. shows the importance of exactly duplicating experimental conditions. C. led to further experiments that ultimately furthered knowledge. D. All of the choices are correct.
Photosynthesis is
A. a chemical process not dependent on chlorophyll. B. not an oxidation-reduction reaction. C. a set of reactions that produces water and carbon dioxide. D. an energy transfer process that produces glucose and oxygen. E. None of the answer choices is correct.
_______, the simplest hydrocarbon, is one carbon atom bonded to four hydrogen atoms.
A. Ketone B. Methane C. Amine D. Phosphate E. Carboxyl