Why can't cells the size of golf-balls exist? A cell that large would not have enough surface area to use in exchanging materials. Vibrio cholerae causes severe diarrhea in its victims.
Why can't cells the size of golf-balls exist?
This form of passive transport requires a transport protein, but since it only works if you can move the substance down a concentration gradient, it does not require energy. Why can't cells the size of golf-balls exist? - A cell that large would be too hypertonic to prevent swelling.
What would happen if the surface area of a large cell became large?
A cell that large would not have enough surface area to use in exchanging materials. The larger the cell, the more nutrients it needs to pull in and the more waste in needs to expel. The volume outgrows the available surface area quickly.
What happens when a plant cell is larger?
The larger the cell, the more nutrients it needs to pull in and the more waste in needs to expel. The volume outgrows the available surface area quickly. What causes a plant to wilt?
Why does cell B lose water faster than cell B?
Both cells lose water, but cell B loses it faster due to the presence of aquaporins. Which of these would you add to a membrane to make it easier for membrane proteins to move about? Phospholipids are the "fluid" part of the fluid mosaic model and unsaturated phospholipids are the most fluid.
WHY CAN T cells the size of golf balls exist?
Why can't cells the size of golf-balls exist? a cell that large would not have enough surface area to use in exchanging materials.
When can a cell transport a molecule across the cell membrane without expending energy such as ATP )? See section 5.2 page?
When can a cell transport a molecules across the cell membrane without expending energy? When the molecule is more concentrated outside the cell.
Why do cells use exocytosis quizlet?
Cells use exocytosis to export proteins that are modified by the Golgi apparatus. Nerve cells and cells of various glands, for example, release proteins by exocytosis.
What happens when a round cell expands in diameter?
When a cell expands in diameter during growth, its volume increases faster than its surface area does. Imagine that a round cell expands until it is four times its original diameter. the volume of the cell has increased 64 times (444) but the surfae area has only increased 16 times (4*4).
What molecules Cannot easily pass through the cell membrane?
Small uncharged polar molecules, such as H2O, also can diffuse through membranes, but larger uncharged polar molecules, such as glucose, cannot. Charged molecules, such as ions, are unable to diffuse through a phospholipid bilayer regardless of size; even H+ ions cannot cross a lipid bilayer by free diffusion.
Which molecule can freely diffuse across a cell membrane?
Only the smallest molecules like water, carbon dioxide, and oxygen can freely diffuse across cell membranes. Larger molecules or charged molecules often require an input of energy to be transported into the cell.
Why do cells use exocytosis?
Exocytosis occurs when a vesicle fuses with the plasma membrane, allowing its contents to be released outside the cell. Exocytosis serves the following purposes: Removing toxins or waste products from the cell's interior: Cells create waste or toxins that must be removed from the cell to maintain homeostasis.
What is exocytosis biology quizlet?
Exocytosis. a process in which material inside a cell is packaged into vesicles and excreted into the extracellular medium.
Why do cells use endocytosis?
Endocytosis is the process of capturing a substance or particle from outside the cell by engulfing it with the cell membrane and bringing it into the cell. Exocytosis describes the process of vesicles fusing with the plasma membrane and releasing their contents to the outside of the cell.
Why cells don't just continue to grow larger as organisms grow larger Why do cells divide?
Cells are limited in size because the outside (the cell membrane) must transport the food and oxygen to the parts inside. As a cell gets bigger, the outside is unable to keep up with the inside, because the inside grows a faster rate than the outside.
Why is the size of the cell limited?
Cell size is limited due to the inability of very large cells to provide nutrients and water and remove wastes in an efficient manner. The size of a cell is limited by the relationship of the cell's outer surface area to its volume or its surface area-to-volume ratio.
Why cells are small in size?
Cells are so little, so they can maximize their ratio of surface area to volume. Smaller cells have a higher ratio which allow more molecules and ions move across the cell membrane per unit of cytoplasmic volume. Cells are so small because they need to be able to get the nutrients in and the waste out quickly.