Most signal molecules: A) easily diffuse through the membrane and bind to a receptor in the cytoplasm. B) bind to membrane receptors and transmit information across a membrane without traversing the membrane. C) carry out functions in the nucleus after binding to a receptor in the cell membrane. D) AandC. E) A, B,andC.

The correct answer is option B) "bind to membrane receptors and transmit information across a membrane without traversing the membrane".

Explanation:

Most signal molecules bind to membrane receptors and transmit information across a membrane without traversing the membrane. The signal is then translated in an activity performed by the inner molecules of the receptor cell that detected the signal molecules. This type of signal transduction allow the cells to communicate in a fast and efficient way.

i'm pretty sure it's spores

correct answer is option a.

tropopause, stratopause and mesopause have all in common aspect that is point of maximum temperature in its layer of the atmosphere. all layers of atmosphere observe abrupt change in temperature. tropopause is the boundary between troposphere and stratosphere. stratopause is the boundary between stratosphere and mesosphere. mesopause is the boundary between mesosphere and thermosphere. these all boundaries are ranges between altitude of 0 to 80 km.