X-ray data showed that the spacing between repeating units along the axis of the DNA helix is
A) 2.0 angstroms.
B) 3.4 angstroms.
C) 20 angstroms.
D) 34 angstroms.
B) 3.4 angstroms.
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A gram-negative, polarly flagellated, aerobic bacillus-shaped bacterium that can degrade a large variety or aromatic compounds is likely a(n)
A) actinobacterium. B) enteric. C) pseudomonad. D) sphingomonad.
The advantage of avian respiration over mammalian respiration is that _______________
a. there is a one way flow of air b. they have spiracles to control airflow c. they have air sacs that allow them to store oxygen d. they do not need to ventilate their lungs
According to the Ohio Department of Natural Resources, which nocturnal species of squirrel is most common but rarely seen?
A. Southern Flying Squirrel B. Red Squirrel C. Eastern Grey Squirrel D. Eastern Fox Squirrel
Which of the following statements about the nucleus is NOT true?
A. The nucleus stores the coded instructions for making the cell's proteins B. The nucleus usually contains a nucleolus region which is where ribosome assembly begins C. The nucleus us the site of protein assembly D. The nucleus us surrounded by a nuclear envelope that lets materials in and out