which of the following is not true about normal flora
What will be an ideal response?
they can never cause infection
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Why are phosphorylation and dephosphorylation reactions commonly used to regulate signal transduction pathways?
A. Phosphate groups are efficient second messengers B. Protein kinases and phosphatases are abundant in most cells C. The hydrolysis of bound GTP generates GDP, which can change the activity of proteins bound to GDP D. The addition or removal of a phosphate group can expose or hide potential binding sites in proteins or change protein activity
E. coli has been isolated and cultured from three different individuals. Upon biochemical testing of these three cultures, you find that there are differences in some reactions. What is the best explanation of these differences?
A. These represent three different species of E. coli. B. This is normal genetic variation seen among strains of E. coli. C. The other two cultures are not really E. coli. D. Mistakes have been made in the test interpretation. E. Two of the cultures are mutants of the other.
This group occupied Europe and western Asia from about 150,000 to 28,000 years ago. They had a
heavier build, more pronounced brow ridges, and slightly larger brains than modern humans, and were culturally and technologically sophisticated.
a. Homo habilis b. Homo erectus c. Australopithecus africanus d. Australopithecus afarensis e. Homo neanderthalensis
Which of the following is synonymous with apoptosis?
a. programmed cell death b. the loss of contact inhibition c. programmed cell life d. the gain of contact inhibition