Which is incorrect about Yersinia pestis?
A. exhibit bipolar staining
B. gram negative rod
C. produces coagulase
D. has a capsule
E. produces enterotoxin
Answer: E. produces enterotoxin
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Base your answers to the questions below on the following information:
Using the patch clamp technique, a researcher measures a single channel in a membrane. The receptor channel passes 3 pA (picoamperes) of ionic current over a period of 8 msec at -60 mV; 1 pA = 10 -12 ampere. Based on your knowledge of nerve transmission, this movement of ions will A) stimulate a change in a postsynaptic membrane. B) not stimulate a change in a postsynaptic membrane. C) stimulate a change in a postsynaptic membrane if three channel events are combined. D) stimulate a change in a postsynaptic membrane if 50 channel events are combined. E) generate a current resulting in membrane depolarization.
Which genes encode proteins that regulate the cell cycle in normal cells?
a. tumor suppressor genes b. proto-oncogenes c. oncogenes d. tumor suppressor genes and proto-oncogenes e. tumor suppressor genes, proto-oncogenes, and oncogenes
Plants can generally absorb and make use of nitrogen in the form of ____
a. NO3- only b. both NO3- and NH4+ c. NH4+ only
d. N2 only e. both N2 and NH4+
For an individual with the XXY chromosomal composition, the expected number of Barr bodies in interphase cells is ________
A) three B) two C) one D) variable E) zero