Hydrogen bonding is strongest between ____.
A. adenine and guanine
B. uracil and thymine
C. guanine and uracil
D. adenine and thymine
E. cytosine and guanine
Answer: E
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In which plant cell or tissue would the pressure component of water potential most often be negative?
A) leaf mesophyll cell B) stem xylem C) stem phloem D) root cortex cell E) root epidermis
Mutated versions of one or both of the genes BRCA1 and BRCA2 are associated with an increased risk of ________
a. breast cancer only b. lung cancer and pancreatic cancer c. both breast cancer and ovarian cancer d. lymphoma only
The valve between "C" and "E" is the ____
a. right AV valve b. pulmonary vein c. left AV valve d. pulmonary valve e. aortic valve
A significant event influencing the rapid
evolution of plants on land after their initial appearance was the a. increase of atmospheric oxygen. b. reduction of ultraviolet radiation penetration through the atmosphere. c. stabilization of global climates. d. increase in soil nutrients. e. merging of land masses