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 willa. stimulate a change in a postsynaptic membrane if 50 channel events are combined. b. stimulate a change in a postsynaptic membrane if three channel events are combined. c. not stimulate a change in a postsynaptic membrane. d. generate a current resulting in membrane depolarization. e. stimulate a change in a postsynaptic membrane

When a cell is in a solution that has the same concentration of water and solutes as its cytoplasm, the cell is said to be in a(n) solution. a. isotonic b. hypotonic c. hypertonic b. facilitated

Embryonic stem cells are cells derived from an embryo. these cells can be used to create new tissues for patients suffering from certain illnesses and disorders. which statement best summarizes why the use of embryonic stem cells could be seen as unethical? a. some people consider embryos to possess rights equal to those of fully developed human beings. b. extracting stem cells from embryos is a very energy-intensive process, which consumes resources that could be used elsewhere. c. embryos are difficult to obtain, so the monetary cost of using them for research outweighs their benefit. d. the process of extracting stem cells from embryos generates biohazardous waste that cannot be safely disposed of.

The human body maintains a temperature of around 98.6 degrees at all times. enzymes are involved in almost every chemical reaction in the body. which of the following describes the connection between these two statements? a. enzymes function best at a specific temperature. b. the body needs to be warm to prevent hypothermia. c. the body is kept relatively warm to prevent too much enzyme action. d. there is no connection between the two statements.