Which of the following best describes a ligand? -a cell membrane protein that allows ions to...
Which of the following best describes a ligand?
-a cell membrane protein that allows ions to cross the membrane
-a transmembrane protein that binds to extracellular signaling molecules
-a molecule that is covalently attached to an amino acid by an enzyme
-a small molecule that binds to a protein and affects the protein\'s function
Homework Answers
Solution:
Statement which best describes a ligand is- a small molecule that binds to a protein and affects the protein\'s function.Ligand bind to the protein by mainly weak hydrogen bonds.To perform their various function, protein binds to a particular ligand.
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Which of the following best describes a ligand?
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1. In paracrine signaling, the signaling molecules affects only: Target cells close to the cell from...
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B3. Cell Membrane and Cell Transport a) What kind of solution should a cell be placed in for it to become lysed? [1 mark] b) Give an example of a transmembrane protein. [1 mark] c) Which form of membrane transport does NOT require the expenditure of energy by the cell? [1 Mark] d) Given a cell with concentration of solutes in the environment lesser than the concentration of solutes in the surrounding fluid.. i. the extracellular fluid is said to...
Match the properties described with one of the four components of a membrane. Interior protein network Phospholipid bilayer Can span both layers of a membrane Often carbohydrate attached to lipid or protein Helps determine the overall shape of a cell Can form channels to allow small molecules to cross membranes Transmembrane protein Cell surface marker Forms a semipermeable barrier Can allow diffusion of gases Reset
There are many pharmacodynamic signaling mechanisms for medications. Which signaling mechanism best describes the action of a drug which involves a coupling protein that in turn activates a separate effector molecule in the cell? Select one: a. G-protein receptors b. tyrosine kinase receptors c. JAK-STAT receptors d. steroid intracellular receptors e. transmembrane ion channels
Question 33 (1 point) Cholera is an infections disease that causes extreme diarrhea, what cell to cell surface receptor and subsequent confirmation change is associated with this? O G-protein linked receptor O G-protein linked receptor and an ion channel O Enzyme linked receptor and ion channel Enzyme liked receptor Question 36 (1 point) Second messengers are... small molecules that turn GTP into GDP for singal transduction small molecules that propagate a signal after it has been initiated by the signaling...
1. In paracrine signaling, the signaling molecules affects only: Target cells close to the cell from which it was secreted a. b. Target cells distant from its site of synthesis in cells of an endocrine organ Both a. and b. с. d. None of these 2. Below are listed the events that occur in cell to cell communication. Signal transduction occurs 1. 2. Plasma membrane receptor binds with a ligand A cellular response is effected 3. 4. Ligand is released...
4. The protein shown below is an enzyme-linked receptor. This means that this protein... Circle your answer a) can speed up chemical reactions. b) can bind to certain signaling molecules. c) all of the above. D. Think about the enzyme-linked receptor we discussed in class. After the signaling molecules binds to this receptor, it causes the active site on the receptor to become available. What binds to this active site? E. Consider the molecule you named in the previous question....
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