Which would be more likely to cause illness-a water sample that tested positive for coliforms or one that tested positive for E. coli O157:H7?
A. Both would be equally capable of causing illness-all coliforms cause illness.
B. The coliform positive sample would be more likely to cause illness. Coliforms are inherently more pathogenic than the weak O157:H7 lab strain of E. coli.
C. The E. coli O157:H7 sample would be more likely to cause illness. This strain of bacterium is highly pathogenic and capable of causing kidney damage.
D. Neither-there is usually a small amount of coliforms (including E. coli O157:H7) in all water.
C.
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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.
Mendel's laws
A) do not apply to multifactorial traits. B) apply to multifactorial traits but may be difficult to follow because the genes contribute only partly to a trait. C) operate in some genes that contribute to a multifactorial trait, but not in others. D) apply only to polygenic, but not multifactorial traits.
The study of evolutionary relationships among organisms is called
A. phylogeny. B. genetics. C. recombinant DNA. D. taxonomy. E. biotechnology.
When GMOs are generated through the transfer of genetic material across species, the GMO is said to be ________
A) transgenic B) exogenic C) cisgenic D) isogenic