A DNA molecule has four "ends"— two on each of the two polynucleotide strands. How many of
these ends are phosphate groups? Fill in the blank(s) with the appropriate word(s).
ANS: 2
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Symbionts such as Aeromonas veronii of leeches and Buchnera symbionts of insects are transmitted ________ to ensure the safe transfer of the symbiont to the next host generation
A) vertically to offspring B) horizontally through infected water C) horizontally through infected secondary hosts D) vertically through the air
Dense mineralized bone tissue that forms the walls of the shafts of long bones is known as:
A. condensed bone. B. spongy bone. C. compact bone. D. trabeculae.
Which level of protein structure consists of a linear sequence of amino acids?
a. 3rd b. 2nd c. 4th d. 1st e. 5th
How do beavers maintain a landscape?
A) massive defoliation of shrubs B) feeding on roots of graminoid plants C) feeding on aspen, willow, and birch trees D) dispersing seeds of mesquite