You discover a new species of lily that has 10 chromosomes (2n=10). Genetic testing reveals that it arose from the interbreeding of two other species of lilies, one of which has 12 chromosomes, and one of which has 8 chromosomes. What is the correct term for the new lily species?
A. allopolyploid
B. allodiploid
C. allotetrapoloid
D. autopolyploid
Answer: B
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Imagine you are entering a darkened cavern. You are excited, but also a little nervous. Your heart rate quickens, your blood pressure rises slightly, and your digestive system activity decreases as blood is diverted to your muscles—all changes that prepare you should you need to move rapidly. This type of change is an example of
A. positive feedback control. B. negative feedback control. C. a failure of homeostasis. D. feedforward regulation. E. open loop feedback.
Which of the following is NOT a line of evidence that Kingdom Animalia is a monophyletic group?
a. The ribosomal RNA of animals is more similar to that of other animals than it is to any other form of life. b. Animals share unique similarities in their cell-to-cell junctions. c. All animals have the same genetic code. d. Animals share similarities in the molecules in their extracellular matrices. e. All animals have bilateral symmetry.
Insulin production is regulated by a positive feedback loop that helps maintain healthy blood sugar levels
Indicate whether the statement is true or false
Why is the immune response to pneumococcal meningitis the most damaging aspect of the disease?
A) Blood clots are formed in the circulatory system in an effort to isolate the bacteria; however, these clots are often the cause of heart attack or stroke in patients that don't seek medical treatment. B) A particularly potent endotoxin stimulates a rapid fever that typically holds at 104°C for 3-4 days unless other actions are taken. C) An exotoxin stimulates severe inflammation and provokes host tissue damage as immune cells release oxygen radicals and enzyme-destroying proteins in response to the toxin. D) Neurons infected with the bacteria are identified and destroyed by the immune system resulting in paralysis or in some cases death. E) Released antibodies bind to the basal membrane of tissues which results in the damage of these tissues and the neighboring cells.