Discuss permeability in plant cell walls?
What will be an ideal response?
The primary plant cell wall does not prevent most solutes from moving into plant cells. The majority
of solutes can diffuse through the wall. However, some molecules such as proteins, RNAs and virus
particles cross the cell wall by way of plasmodesmata. Plasmodesmata also connect adjacent cells.
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In the comparison between a spiral staircase and a DNA molecule, the steps would correspond to
A. sugars. B. hydrogen bonds. C. base pairs. D. nucleotides. E. phosphates.
__________ are electrically excitable cells that signal other cells by means of chemical messages. Fill in the blank(s) with the appropriate word(s)
Which of the following acts as an emulsifier?
a. lipase b. amylase c. bile d. trypsin
A section of a neuron's membrane becomes temporarily positive on the inside when:
A) ion channels open and potassium ions rush in. B) negatively charged proteins exit the cell. C) neurotransmitters enter the cell. D) ion channels open and sodium ions rush in.