Fill in the blank assignment Biological membranes are primarily formed from two

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Fill in the blank assignment

Biological membranes are primarily formed from two types of organic molecules, (16)______, composed of amino acids and (17)_____, composed of phosphates, glycerol and fatty acids. Membranes are (18)___ ____ to molecules allowing some to freely pass through and restricting or preventing the passage of others. Molecules may cross membranes on their own moving from areas of higher to lower concentration, with no expenditure of external energy, in a process called (19)____. Protein molecules that span the membrane may assist or carry other molecules across the membrane, (20)_____ _____, also from areas of higher to lower concentration. (21)____ _____ moves molecules across membranes from areas of lower to higher concentration with the use of energy in the form of ATP. As opposed to the process of passive transport, illustrated by answers (19) and (20), molecules move against their (22) ______ _______.

If you compare two situations on either side of a cellular membrane, they are said to be (23)_____ if their solute concentrations are equal. Solutions that have higher solute concentrations are (24)_____ when compared to solutions with lower solute concentrations, (25)______. If molecules or substances are too large to pass through membranes on their own or with the use of protein carriers, vesicles may help to move these materials in or out of the cell as vesicles fuse with or pinch off membranes. This (26)____ ____ of materials is called (27)____ if materials are moved into cells. The transport of lage solids or "cell-eating" is (28)_____. Entry of liquids is termed (29)____ or "cell drinking." Movement of materials out of the cell is (30)_____.

Explanation / Answer

(16)"PROTEINS"

(17)"PHOSPHOLIPIDS"

(18)"SEMI-PERMIABLE"

(19)"DIFFUSION"

(20)"FACULTATIVE DIFFUSION"

(21)"ACTIVE TRANSPORT"

(22) "CONCENTRATION GRADIENT"

Biological membranes are primarily formed from two types of organic molecules, (16)"PROTEINS", composed of amino acids and (17)"PHOSPHOLIPIDS", composed of phosphates, glycerol and fatty acids.

Membranes are (18)"SEMI-PERMIABLE" to molecules allowing some to freely pass through and restricting or preventing the passage of others.

Molecules may cross membranes on their own moving from areas of higher to lower concentration, with no expenditure of external energy, in a process called (19)"DIFFUSION".

Protein molecules that span the membrane may assist or carry other molecules across the membrane, ///(20)"FACULTATIVE DIFFUSION", also from areas of higher to lower concentration.

(21)"ACTIVE TRANSPORT" moves molecules across membranes from areas of lower to higher concentration with the use of energy in the form of ATP. As opposed to the process of passive transport, illustrated by answers (19) and (20), molecules move against their (22) "CONCENTRATION GRADIENT".

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