Recombination rates across a chromosome:
a. are highly variable.
b. are large in recombination hotspots.
c. are nearly equal.
d. A and B.
e. None of the above.
D
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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.
One advantage that angiosperms have is a unique triploid ____, a nutritive tissue produced during
fertilization.
a. seed coat b. endosperm c. ovule d. pollen sac e. ovary
Because of the high pressure and cold temperatures, few species of organisms survive in the deep benthic zone of the ocean
Indicate whether the statement is true or false
Phosphate fertilizers have increased the amount of phosphate in lakes and other bodies of water. What effect does this increase have on the phytoplankton in the water?
A) It increases their likelihood of being eaten. B) It stimulates their growth. C) It causes them to form toxic compounds. D) It reduces their photosynthetic capacity. E) It kills them.