LABORATORY REVIEW
MOLECULAR BIOLOGY
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Substances are moving rapidly across the cell membrane
|
|
|
ATP is being rapidly consumed near the cellular membrane
|
|
|
substance are moving from high to low concentrations
|
|
|
substances are moving through channels in the cell membrane
|
Detailed explanation-1: -b. ATP is being rapidly consumed near the cellular membrane.
Detailed explanation-2: -Which would be the best evidence that a cell is using active transport to move a substance across its cell membrane? ATP is being rapidly consumed near the cellular membrane.
Detailed explanation-3: -The type of transport that would be best to move substances into or out of the cell quickly would be active transport.
Detailed explanation-4: -The active transport of small molecules or ions across a cell membrane is generally carried out by transport proteins that are found in the membrane. Larger molecules such as starch can also be actively transported across the cell membrane by processes called endocytosis and exocytosis.
Detailed explanation-5: -ATP molecules are constantly colliding with the cytoplasmic face of the membrane. When an ATP molecule strikes its binding site on the carrier proteins, it attaches there. The release of energy causes a conformational change in the carrier protein.