Which DNA molecule form is a left-handed?
A. A DNA
B. B DNA
C. Z DNA
D. R DNA
C
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What type of covalent bond between amino acid side chains (R-groups) functions in maintaining a polypeptide's specific three-dimensional shape?
A) ionic bond B) hydrophobic interaction C) van der Waals interaction D) disulfide bond E) hydrogen bond
In phloem movement, ____ does not serve as a source
a. photosynthesizing cells in a leaf b. roots c. photosynthesizing cells in a stem d. food storage cells in a stem e. soil
____ is an anticoagulant used by leeches
a. Chitin b. Hirudin c. Saxitoxin d. Pheromone e. Calcium carbonate
Which of the following lists plants in order from most primitive to most advanced?
A. ferns ® mosses ® angiosperms ® gymnosperms B. mosses ® gymnosperms ® ferns ® angiosperms C. mosses ® ferns ® angiosperms ® gymnosperms D. mosses ® ferns ® gymnosperms ® angiosperms