Question

Part 6

Insulin receptors are located on the plasma membrane. That means;

• A. insulin signaling does not need signal transduction

• B. insulin receptor can transport insulin into the cell

• C. insulin does not enter into the cell

• D. insulin may be a small hydrophobic molecule

What is the purpose of signal transduction during cell signaling?

• A. to process and amplify the signal

• B. to receive the signaling ligand

• C. to inactivate other signals

• D. to transport signaling ligand

When blood glucose level is high, pancreas responds by producing insulin and secreting it to the blood. In response to insulin, liver cells and muscle cells take in glucose from blood. The gene for insulin must be highly expressed in which group of cells?

• A. all body cells

• B. blood cells

• C. pancreatic cells

• D. muscle cells

• E. liver cells

Cadherin proteins in desmosomes (anchoring junctions) are particularly useful;

• A. to form openings between plant cells

• B. to create a watertight seal between cells

• C. for prokaryotes to communicate

• D. to keep similar cells in the same tissue

Answer 1

1 Ans- c insulin does not enter into the cell .

The receptors for insulin are present on the plasma membrane when insulin bind to the receptors there is activation of thyrosine kinase which inturn activate the GLUT 4 to uptake glucose .

2 ans : d to transport the signiling ligand

The process of signal transduction is the activation of the cells through exterior to interior of the cell so that cell get activated and process is carried out .

3 ans: c pancreatic cell

The production of insulin take place in the beta cells of the pancreas when there is more glucose concentration more insulin is produced to activate the glucose uptake of cell .

4.ans: B to creat water light seal between cells

Cadherin proteins in desmosomes will help to maintain the cell to cell integrity which are under high mechanical activities like heart cells etc .