At the end of a run of gel electrophoresis, where will you find the smallest fragments of DNA?
a. near the negative electrode side of the gel
b. in the middle of the gel
c. near the positive electrode side of the gel
d. in the origin wells
c. near the positive electrode side of the gel
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Agrobacterium infects plants and causes them to form tumors. You determine that tumor formation requires a large amount of the plant's energy for tissue formation. How might this change the number of offspring a plant produces
, and what is the most likely explanation for this change? A) The number of offspring should increase, because in general, illness increases the reproductive output of organisms. B) The number of offspring should increase, because the bacteria will provide energy for the plant. C) The number of offspring should decrease, because the plant will divert energy from reproduction to tumor formation. D) There should be no effect of infection on offspring production because energy for reproduction is independent of infection.
How does the human male body respond to a decrease in testosterone in the bloodstream?
a. The hypothalamus releases testosterone. b. The hypothalamus releases GnRH. c. The Sertoli cells release testosterone. d. The Leydig cells release FSH. e. The Leydig cells release inhibin.
High ____ concentrations in Lake Erie encouraged the growth of photosynthetic algae, which changed the
phytoplankton community.
a. sewage b. detergent c. coliform bacteria d. phosphorous e. dead fish
Which of the following is a property of all living organisms?
a. Reproduce using RNA. b. Use the sun to fuel metabolic processes. c. Grow and develop based on inherited RNA. d. Respond to stimuli in the external environment.