The X-ray diffraction pattern for DNA suggested to Wilkins and Franklin all of the following features about DNA EXCEPT
A) a DNA molecule has a uniform diameter of 2 nanometers.
B) the phosphate-sugar "backbone" of the molecule is on the outside of the DNA helix.
C) the DNA molecule consists of repeating subunits.
D) a DNA molecule is helical.
E) in a DNA molecule, A pairs with T and G pairs with C.
E
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Create an experiment where you would use both a Southern blot and a Northern blot to determine if a newly isolated bacterium contains and actively uses the same catabolic pathway as previously demonstrated
What is the value in doing the Southern blot first? With results from these experiments, how would you conclude if the same pathway is active or not? What will be an ideal response?
Which of the following statements best describes the habitats of Vibrio spp., Aeromonas spp., Plesiomonas shigelloides, and Chromobacterium violaceum?
a. Habitats are limited to the upper respira-tory tract of various mammals. b. Habitats are limited to the gastrointestinal tract. c. Habitats are mostly soil and water envi-ronment. d. Habitats are limited mostly to soil.
A structure with stems and leaves that arise from apical meristems is a ____
a. vascular system b. protonema c. sporangium d. rhizome e. shoot system
Which group of fishes evolved first (in other words, is most ancient)?
A. Bony fishes B. Cartilaginous fishes C. Lobe-finned fishes D. Jawless fishes