The principle of species individuality suggests that in response to climate change, species should migrate
A. as individual species.
B. as individual ecosystems.
C. through a process of primary succession.
D. in response to a steady level of disturbance.
E. None of these choices are correct.
A. as individual species.
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There is a spectrum of syndromes in humans known as Xeroderma pigmentosum
The individuals that have XD most commonly have mutations in their nucleotide excision DNA repair mechanisms that make them particularly susceptible to environmental mutagens such as UV light. Individuals have to be careful with how much sunlight they are exposed to since they have an extremely elevated chance for developing skin cancer.. There have been several cell lines that have been established from XD patients that can be studied in tissue culture. In an experiment several different cell lines of unknown origin were tested for their ability to undergo unscheduled DNA synthesis (UDS), an assay for DNA repair. In this assay the amount of radioactive nucleotides that are incorporated into DNA after the cell sustains a mutagenic event are measured. The amount of radioactivity incorporated is measured by the number of counts per minute (CPM). Below is a table from such an experiment. Which cell line is most likely from XD patient(s)? Cell line CPM in UDS assay CPM if no mutagenic event A 2,500 2,750 B 300,000 5,000 C 45,000 25,000 D 275,000 50,000 Wild-type control 750,000 75,000 A. A B. B C. C D. D
Approximately what percent of the energy that enters a trophic level becomes available to the next trophic level?
a. 2 to 12 b. 3 to 13 c. 4 to 14 d. 5 to 15 e. 5 to 30
Which type of tissue forms an electrical communication system within the body?
A) nervous B) blood C) connective D) muscle
Mom and dad come to you, their doctors, and report no dirty diapers after feedings. Their now 3-day-old baby isn't pooping, and they feel something is wrong. Which of the following reasons could possibly explain this?
a. The baby hasn't eaten enough. b. There is a blockage somewhere in the baby's digestive track. c. The baby has no bacteria in its gut. d. The digestive enzymes in the gut are not functioning properly.