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Can large hydrophobic molecules cross cell membranes?
Yes, large hydrophobic molecules can cross cell membranes through passive diffusion.
How do large polar molecules enter the cell?
Large polar molecules enter the cell through facilitated diffusion or active transport, which require the assistance of specific protein channels or carriers in the cell membrane. These proteins help transport the molecules across the membrane against a concentration gradient or when the molecules are too large to pass through on their own.
What substances cannot cross the blood-brain barrier?
Large molecules, such as proteins and most drugs, cannot easily cross the blood-brain barrier.
Will starch iodine and water molecules cross a thin polyethylene molecule?
No, starch iodine and water molecules will not be able to cross a thin polyethylene molecule due to its non-porous nature, which prevents the passage of large molecules like starch iodine and water molecules. Polyethylene is a tightly packed polymer that forms a barrier to the diffusion of such molecules.
What can not cross the semipermeable membrane?
Large molecules such as proteins and polysaccharides cannot easily cross a semipermeable membrane due to their size. Additionally, charged molecules like ions may have difficulty crossing depending on the membrane's properties. Lipid-soluble molecules, gases, and small uncharged polar molecules can usually pass through more easily.
What type of molecule embedded in the cell membrance allows larger molecule to pass through the membrance by active transport?
Transport proteins allow the active transport of large molecules through the cellular membrane.
Can large hydrophobic molecules cross cell membranes?
Yes, large hydrophobic molecules can cross cell membranes through passive diffusion.
Which molecules do not normally cross the nuclear membrane?
Large molecules such as proteins and RNA do not normally cross the nuclear membrane. They require specific transport mechanisms, such as nuclear pores, to move between the nucleus and the cytoplasm. This selective transport ensures that only specific molecules can enter or exit the nucleus.
Large solutes are transported across a cell membrance by?
exocytosis
The nucleus is surrounded by a semipermeable membrane. what would happen if this layer were permeable to most substances?
Large molecules would be able to enter and damage the nucleus.
Large molecules are surrounded by the cell membrane and enter the cell?
Large molecules can enter cells through processes like endocytosis, where the cell membrane surrounds the molecule and engulfs it in a vesicle. This allows large molecules to be transported into the cell without crossing the lipid bilayer of the membrane.
What kind of substances do protein channels allow to cross membranes?
Ions and large molecules
What part of the membrane helps large carbohydrate molecules enter the cell?
Globular proteins
What part of the membrane would help a large carbohydrate molecules enter the cell?
Globular proteins
How do large polar molecules enter the cell?
Large polar molecules enter the cell through facilitated diffusion or active transport, which require the assistance of specific protein channels or carriers in the cell membrane. These proteins help transport the molecules across the membrane against a concentration gradient or when the molecules are too large to pass through on their own.
What substances cannot cross the blood-brain barrier?
Large molecules, such as proteins and most drugs, cannot easily cross the blood-brain barrier.
What are large protein molecules from its mother's milk that enter the cells lining the baby's digestive tract via?
endocytosis
