Which of the following is not involved in secondary active t

Which of the following is not involved in secondary active transport? the direct use of ATP. the ATP plasma membrane coupling to another transport system use of an existing concentration gradient the ability to concentrate the transported molecule According to the fluid mosaic model, what is the structure of a cell membrane? a fluid phospholipid bilayer in which carbohydrates are embedded a protein bilayer that behaves like a liquid crystal a lipid-protein sandwich with carbohydrates attached to the surface a fluid with scattered acids phospholipid bilayer in which proteins are embedded Which of the following is not a function of membrane proteins? catalyzing chemical reactions making the membrane impermeable acting as receptors for chemical signals converting energy from one form to another transporting specific molecules or ions into and out of the cell Which of the following processes includes all others? osmosis diffusion of a solute across a membrane facilitated diffusion passive transport transport of an ion down its electrochemical gradient Which of the following molecules do not contain nitrogen? amino acids DNA nucleic acids proteins. Sugars

Solution

7. A

Secondary active transport, is transport of molecules across the cell membrane utilizing energy in other forms than ATP.

8. C

Fluid mosaic model have been given to define a plasma membrane which is defined by the regions within the membrane with phospholipids and protein composition that promote the formation of lipid rafts or protein and glycoprotein complexes.

9. D

It can not convert energy from one form to another plasma membrane basic work is to protect the cell and provide selective permeability to cell. all other option are helping and involed in that process but energy conversion can not be role of plasma membrane.

10. D

Passive transport include all other option which can transport ion or molecule down the electrochemical gradient. Osmosis and diffusion are part of passive diffusion.

11. E

sugar do not contain nitrogen some corbohydrate contains nitrogen but sugar do not contain nitrogen. sugar molecules include glucose, sucrose, lactose, fructose, maltose, lactose and galactose and they do not contain nitrogen.