What feature of RNA is directly or indirectly responsible for the unique structural properties of RNA?
What will be an ideal response?
The 2'OH of ribose is responsible. It gives RNA its unique pucker, distinct helical geometry, and enables direct or water-mediated hydrogen bonding between the 2'OH of one nucleotide and the adjacent ribose or phosphate group.
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An atom has 20 electrons and 20 neutrons. What is the mass of this atom?
A. 10 B. 20 C. 40 D. 80
Which of the following represents a different principle for food preservation?
A. Heating B. Addition of salt C. Freeze-drying D. Smoking
The osmoregulatory process called secretion refers to the _____
A) reabsorption of nutrients from a filtrate B) selective elimination of excess ions and toxins from body fluids C) formation of an osmotic gradient along an excretory structure D) expulsion of urine from the body
Hydrogen bonds are found in all of the following EXCEPT
A) between phosphates in ATP. B) in ?-helices. C) between water molecules. D) in the DNA double helix between nucleotides. E) between the R groups of amino acids in proteins.