When a pollutant interferes with photosynthesis of phytoplankton it indirectly affects higher trophic levels
Indicate whether the statement is true or false
T
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A nucleus is 4 ?m in diameter. Its DNA is composed of a million base pairs. Approximately how much does it need to be condensed in order to fit inside the nucleus?
A. 30-fold B. 100,000-fold C. 1 million-fold D. 3 million-fold
The "QRS" complex visible in a normal electrocardiogram is associated with the
A. excitation from the AV node and depolarization of the ventricles. B. excitation from the SA node and depolarization of the atria. C. excitation from the SA node and repolarization of the ventricles. D. excitation from the AV node and repolarization of the atria. E. activity in the vagus nerve and release of acetylcholine.
Formylmethionine is the first amino acid in proteins in ____
a. Archaea only b. Bacteria only c. both Archaea and Bacteria d. neither Archaea nor Bacteria e. Archaea, Bacteria and Eukarya
Of all the different codons that exist, three of them
a. are involved in mutations. b. do not specify a particular amino acid. c. cannot be copied. d. do not specify a particular amino acid and are signals to begin translation. e. do not specify a particular amino acid and are signals to terminate translation.