Please answer all I’m out of questions thank you!!!! Multiple Choice (2pts) Carb

Question

Please answer all I’m out of questions thank you!!!!

Multiple Choice (2pts) Carbohydrate layer on the plasma membrane includes all of the following except: (a) Adhesion (b) Recognition 1. (c) Gives a cell its distinctive characteristics (d) None of these answers are correct 2. Bacteriorhodopsin: (a) Act as a membrane transport protein (b) Act as a membrane channel protein Which structures add to the fluidity of the plasma membrane: (a) Carbohydrates (b) ATP (c) Act as a membrane protein receptor (d) Act as a membrane gated channel protein 3. (c) Glycocalyx (d) Cell cortex 4. Which enzyme ensures there is an equal distribution of newly synthesized phospholipids across the (a) Flippase (c) Scarmblases (d) transferase (b) Spectrin Carbohydrate layer on the plasma membrane: (a) Protection (b) Cell Recognition 5. (c) Gives a cell its distinctive characteristics (d) All are correct protein is a major component of the cortex in RBCs. Mutations in this protein develop a form of anemia that can cause to RBCs to develop a flattened shape, making them extremely fragile (a) Lectin (b) Spectrin (c) Glycocalyx (d) Porins Na+ pumps function is to: (a) Pump Na+ into the cell (b) Pump Na+ out of the cell 7. (c) pump Nat into and out of the cell (d) Pump K+ out of the cell 8. Ca+ pump include all of the following EXCEPT (c) Pump Ca+ out of the cell (a) It is an ATPase (b) Pump Ca+ into the cell The probability of a (a) Ligand gated (b) Voltage gated (d) Pump Ca+ against its concentration gradient channel being open is controlled by the membrane potential. (c) Mechanical gated (d) Transmitter-gated channel is controlled by the binding of some molecules to the channel. 10. The opening of a 11. The opening of 12. The shape and mechanical properties of plant, yeast, and bacteria cells is established by a (a) Ligand gated (b) Vokage gated (c) Mechanical gated (d) Transmitter-gated channel is controlled by a mechanical force applied to the channel (a) Ligand gat (b) Voltage gated (e) Mechanical gated (d) Transmitter-gated (a) Plasma membrane (b) Cell membrane (c) Plasma wall (d) Cell wall 13. Which of the following molecules would NOT be found in animal plasma membranes? (c) Glycolipids (d) Nucleie acids (a) Proteins (b) Phospholipids (e) Cholesterol 14. Which molecule in animal plasma membranes reduses the permeability of the membrane to mhost biolog molecules? (a) Proteins (c) Glycolipids (d) Nucleie acids (c) Cholesterol (b) Phospholipids phospholipid bilayer has a solid consistency? (b) False (a) True

Explanation / Answer

Ans 1) c) Given a cell its distinctive characteristics

The glycocalyx layer or the carbohydrate layer is very important as it acts as a base for many molecules to bind to it. It is majorly a protein linked and lipid linked system which helps in the adhesion of other molecules as well as there are some molecules that acts as recognition signals.

Ans 2) a) Acts as membrane transport proteins

It is a plasma membrane transport protein which acts as proton pump. It helps in capturing light energy and use it to move the protons across the membrane.

Ans 3) c) Glycocalyx

The fluid mosaic which is responsible for imparting the much needed fluidity is a combination of glycolipids and glycoproteins which is called glycocalyx. This helps in keeping the membrane flexible.

Ans 4) a)Flippase

They are transmembrane lipid transporter proteins and it helps in the movement of the phospholipid molecules between two parts of the cell membranes. This helps in ensuring that there is always an equal distribution of phospholipids across the membrane.

Ans 5) d) all are correct

Carbohydrate layer outside the plasma membrane plays an important role and helps in offering number of functions. It imparts protection, embeds signal molecules that act as recognition molecules and gives the cell at times different characteristics.

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