During DNA replication, the enzyme DNA ________ opens up a short segment of the helix, exposing its nitrogenous bases.
Fill in the blank(s) with the appropriate word(s).
helicase
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Plastoquinol transfers electrons from
A) cytochrome b6/f complex to coenzyme Q. B) photosystem II to photosystem I. C) water to photosystem II. D) light harvesting complex II to photosystem II. E) cytochrome b6/f to plastiquinone
The most common cause of low sperm count in males is _____
a. varicocele b. undescended testicles c. testicular failure d. semen disorders e. obstructions
The GFP gene is useful as a reporter gene because the cells and tissues with it emit bioluminescence when treated with what, which functions as a substrate?
What will be an ideal response?
Four of the following statements are true. Which one is not?
A. Amniotes are the predominant vertebrates on land. B. Tetrapod vertebrates have four bony limbs. C. All chordate embryos have a notochord, a dorsal tubular nerve cord. D. Lancelets and tunicates are the two groups of invertebrate chordates. E. The backbone and the other skeletal elements are components of the vertebrate exoskeleton.