Which male structure is shared by both the urinary and reproductive systems?
a. urinary bladder
b. prostate gland
c. ureter
d. vas deferens
e. urethra
ANSWER: e
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As many bacterial molecular sequences evolve quickly and/or continuously, creating a bacterial phylogenetic tree based on molecular sequences can be difficult
A. true B. false
The figures above represent three hypothetical populations; each circle is an organism. Write the letter of the pattern that you would expect to find. This is a social species
A. A B. B C. C
Suppose you explored a new planet and found a photosynthetic organism unlike any on Earth. You
repeat Engelmann's classic experiment using this new organism in place of Spirogyra and find that oxygen-dependent bacteria cluster near the green and yellow portions of the spectrum. What does this tell you?
a. The sun of this new planet emits different wavelengths of light than our own. b. This new organism is using yellow and green light to drive photosynthesis. c. This organism is green just like plants on Earth. d. This organism utilizes the most energy-rich photons of the spectrum. e. This new organism is using blue and red light to drive photosynthesis.
One strain of rII- phage has a deletion in the rII region, another has a point mutation in the rII region. When E. coli K(?) cells are infected with either rII- phage (not both) no plaques form. When E. coli K(?) cells are infected with both rII- phage simultaneously plaques do form. Why do plaques form when E. coli K(?) cells are infected with both types of rII- phage simultaneously?
A) Recombination between the two phage genomes resulted in a wild-type phage. B) The two phage have mutations in different rII genes and their genomes complement each other. C) A protein made by the deletion phage can repair the DNA of the phage with the point mutation. D) Bacteria can survive infection with one phage, but they cannot survive infection with two phages.