In the process of molecular cloning, which of the following cuts DNA double strands so that they have sticky ends?
a. restriction enzyme
b. recombinant protein
c. plasmid
d. codon
a. restriction enzyme
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A chemist adds a chemical to pure water and there is a 100 fold increase in the concentration of hydrogen ions. What is the best approximation of the new pH value?
A. 0 B. 5 C. 7 D. 9 E. 14
Although miRNAs and siRNAs share many similarities, including their incorporation into the RISC complex,
they differ in that with siRNA the single-stranded sequence that binds to targeted mRNAs results in cleavage of the mRNA and more rapid degradation by nucleases. A. true B. false
When a mutation disrupts or stops synthesis of a one of the globin chains of hemoglobin, the resulting disorder is called ________
a. iron-deficiency anemia b. beta-thalassemia c. polycythemia d. leukemia
Which one of the following statements about endosymbiosis and the origin of the eukaryotic cell is FALSE?
A. Mitochondria are the descendants of purple bacteria. B. The chloroplasts of red and green algae are the descendants of cyanobacteria. C. Algae incorporated prokaryotic cells that became chloroplasts, but never acquired mitochondria. D. Many compartments of the eukaryotic cell are derived from the endomembrane system. E. Ultimately, both the chloroplast and the mitochondria of eukaryotes are descendants of prokaryotic cells.