AP Bio Pearson Unit 4 questions and answers with solutions.

AP Bio Pearson Unit 4 questions and answers
with solutions

Which of the following component molecules of the plasma membrane is most important in the
reception phase of cell signaling? - ANSWER Protein



Large molecules are moved out of the cell by which of the following processes? - ANSWER
Exocytosis



In cell signaling how is the flow of specific ions regulated? - ANSWER Opening and closing of
ligand gated ion channels



What is a G protein? - ANSWER Protein on the cytoplasmic side of a membrane



Which of the following can activate a protein by transferring a phosphate group to it? - ANSWER
Protein Kinase



Many signal transduction pathways use second messengers to - ANSWER Relay the message
from the inside of the membrane throughout the cytoplasm



Which of the following signal molecules pass through the plasma membrane and bind to
intracellular receptors that move into the nucleus and function as transcription factors to
regulate gene expression? - ANSWER Testosterone--a steroid hormone



Which observation suggested to Sutherland the involvement of a second messenger in
epinephrine's effect on liver cells? - ANSWER Glycogen breakdown was observed only when
epinephrine was administered to intact cells