Double-stranded DNA absorbs less UV light than single-stranded DNAbecause:
A. base stacking in double-stranded DNA increases the absorbance of white light and causes a decrease in the amount of UV light it can absorb. This decrease in UV absorbance is called the hyperchromic effect.
B. the bases are on the inside of the helix, inaccessible to the UV light in double-stranded
DNA.
C. in single-stranded DNA the bases are not interacting so more photons can be absorbed by the pentose rings.
D. single-stranded DNA actually absorbs more of the UV light, making less light available to double-stranded DNA.
E. of the hypochromic effect that results when hydrogen bonding and base stacking in double-stranded DNA limits resonance in the aromatic rings of the bases.
E
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An active continental margin is found: a. where the leading edge of a continental crust always subducts
b. within a tectonic plate and on a wide continental margin. c. where the leading edge of a continental crust collides with ocean crust. d. in an area of active erosion and weathering.
A difference in charge between guard cell cytoplasm and extracellular fluid is called ____
a. osmosis b. tension c. turgor d. pressure gradient e. voltage
How is the 4-letter language of nucleic acids converted into the 20-word language of amino acids?
a. The 4 nucleic acid bases combine in 2-letter combinations that define different amino acids. b. The 4 nucleic acid bases combine in 3-letter sequences that define different amino acids. c. Triplets of the 2-letter nucleic acid bases are translated into the 20 different amino acids. d. The 4 bases each specify 1 amino acid, which give rise to the remaining 16 amino acids. e. The 4 bases are first converted into tRNA molecules, which can each attach to 5 amino acids.
List the four primary tissue types found in the human body and indicate their main function(s).
What will be an ideal response?