Mutations of trpL decrease the efficiency of transcriptional regulation by disrupting the formation of which stem-loop structure?
What will be an ideal response?
3-4 (termination) loop
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If there are two alleles for a gene in a population, and the frequency of the dominant allele (p) is .5,
then the frequency of the recessive allele (q) is
a. .5. b. .025. c. .25. d. .75. e. .05.
The survival of most organisms is immediately threatened if they live at the site of a catastrophic forest fire, volcanic eruption, or dust storm. These events, however, can launch soot, ash, or dust into different levels of the atmosphere, measurably lowering available sunlight at locations thousands of miles from the site. The are most quickly and strongly impacted at these distances, with lack of growth and reproduction.
A. autotrophs, such as crops and woodlands B. heterotrophs, such as humans and livestock C. deep-sea thermal vent communities D. All of the answer choices are correct. E. All of the organisms in domain Bacteria.
Which of the following would occur in a time of severe dehydration?
a. decreased water reabsorption b. increased urine production c. elevated ADH levels d. decreased aldosterone levels e. decreased renin production
Which of the following animal phyla are most closely related?
A) Porifera and Cnidaria B) Echinodermata and Chordata C) Arthropoda and Annelida D) Platyhelminthes and Nematoda