Which DNA molecule form is a left-handed?

A. A DNA
B. B DNA
C. Z DNA
D. R DNA


C

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

____ is an anticoagulant used by leeches

a. Chitin b. Hirudin c. Saxitoxin d. Pheromone e. Calcium carbonate

Biology & Microbiology

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

Biology & Microbiology