What is true of intercellular signals that do not go through direct connections between cells, such as plasmodesmata? a. the signal fails to reach the inside of the cell, and the cell does not respond. b. the signal is transferred to an adjacent cell for signal transmission. c. an ion-linked channel to the nucleus opens up. d. a receptor molecule accepts the signal and transports it inside the cell.

I believe that what happens here is that when those cells carrying those intercellular signals do no pass through the connections, actually the signal is passed through or are transferred to adjacent cells for signal transmission, hence the answer is:

B

1. 1 mole of anything contains 6.022x10^23 pieces  

d  

2. a  

3. c, number  

5. 1.24x10^24atoms / 6.022x10^23atoms/mole = 2moles h2 atoms  

6. fe2br3 mass = 2moles x mass fe + 3 moles x mass br  

molar mass = grams / number of moles = g/mole  

to find moles = g / molar mass  

to find mass = g = molar mass / moles