Why are viroids resistant to nucleases?
A.
Having a circular RNA "genome," they are resistant to the digestion of most exonucleases (that nibble/digest the free ends of RNA or DNA).
B.
Having a circular RNA "genome," with no protein shell, they are resistant to the protein-degrading activities of nucleases.
C. Nucleases will only digest DNA, not RNA-so viroids are protected.
D. Viroids have only been identified in plants. Plant nucleases cannot digest RNA.
A
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Sugars dissolve well in water because of water's ______.
A. polarity B. ionic bonds C. hydrophobic exclusion D. cohesiveness
You drive a nail into a tree that is 10 feet tall and come back 10 years later. The tree is now 30 feet tall, but the nail is the same distance from the ground. This is because primary growth of the tree is from the
A. lateral meristem. B. intercalary meristem. C. root tip. D. node. E. apical meristem.
The underlying problem in Gaucher disease is ____
a. the spontaneous breakdown of red blood cells b. the accumulation of fat in white blood cells c. the breakdown of the myelin sheath around nerves d. a hypertrophied spleen e. the lack of critical liver enzymes
What is the function of the release factor (RF)?
A. It releases the ribosome from the eR to allow polypeptides into the cytosol. B. It separates tRNA in the A site from the growing polypeptide. C. It binds to the stop codon in the A site in place of a tRNA. D. It releases the amino acid from its tRNA to allow the amino acid to form a peptide bond. E. It supplies a source of energy for termination of translation.