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.
An electrical current of 1 A is approximately 6 x 1018 electrical charges per second; how many ions pass through the channel when it is open?
A) 144,000 ions
B) 2400 ions
C) 8,640,000 ions
D) 8640 ions
E) You cannot determine this from the information given.
A) 144,000 ions
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The annual growth rings seen in trees are made up of
a. apical meristem. b. cork cambium. c. vascular cambium. d. both apical meristem and cork cambium.
Which of the following is NOT a structural
component of any virus?
a. double stranded RNA b. single stranded DNA c. cell membranes d. ribosomes e. all of these ARE structural components of viruses
The electronegativity of an atom is a measure of its ability to attract electrons to its outer shell from another atom.
Answer the following statement true (T) or false (F)
A prescription medication lists a rare side effect of impairing the movement of smooth muscle. This medication could potentially affect the:
A) walls of the small intestine. B) heart. C) muscles that move your arms and legs. D) muscles that move the eyeballs.