Sea anemones and other cnidarians have
a. radial symmetry.
b. a “nerve net.”
c. tentacles.
d. no centralized brain
e. all of these.
Answer: e
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Hemoglobin transports oxygen in the blood and consists of a chain of 146 amino acids. How many different types of amino acids are used to construct proteins?
A. 2 B. 20 C. 146 D. 200
A defining characteristic of eukaryotic organisms is that they
A. have their transcription occurring in the cytoplasm and translation in the nucleus. B. have their transcription occurring in the nucleus and translation in the cytoplasm. C. have only operons to assist in gene expression. D. carry out protein synthesis only in the presence of the cAMP molecule. E. use the leucine zipper primarily for the production of the amino acid tryptophan.
Mirror-image stereoisomers are also optical isomers.
a. true b. false
Which city is considered a brown-air city because the pollutants in the air undergo chemical reactions in the sunlight to form smog?
A. Boston B. Philadelphia C. New York D. Los Angeles E. All of the choices are correct.