j-man

Gap junctions, important for intercellular communication, can function as follows: Question 13 options: A. They can be open or closed depending on the appropriate level of signal (e.g., Ca2+). B. They can allow molecules of up to 1,000 Daltons (molecular weight) pass from one to another of interconnected cells. C. Both D. Neither

Plants receive their nutrients mainly from

A)chlorophyll

B)atmosphere

C)light

D)soil