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Large polar molecules, such as phospholipids, play a crucial role in the formation of biological membranes by arranging themselves in a bilayer structure. This bilayer acts as a barrier that separates the internal environment of cells from the external environment, allowing for selective permeability and maintaining cell integrity.
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Can large hydrophobic molecules cross cell membranes?
Yes, large hydrophobic molecules can cross cell membranes through passive diffusion.
What substance is used to break down large organic molecules?
Enzymes are biological molecules that catalyze chemical reactions, breaking down large organic molecules into smaller molecules. They are commonly used in biological processes to facilitate digestion and cellular metabolism.
What are large biological molecules put together by?
Large biological molecules are put together by smaller building blocks known as monomers. These monomers are linked through chemical reactions to form larger molecules called polymers, such as proteins from amino acids, nucleic acids from nucleotides, and carbohydrates from simple sugars.
Lipids differ from other large biological molecules in that they?
are nonpolar and hydrophobic, making them insoluble in water. They serve as energy storage molecules, structural components of membranes, and signaling molecules in cells. Lipids include fats, oils, phospholipids, and steroids.
Why don't starch molecules pass through partially permeable membranes?
Starch molecules are too large to pass through the pores of a partially permeable membrane. The size exclusion limit of the membrane restricts the passage of larger molecules like starch while allowing smaller molecules like water to pass through via osmosis.
Can large hydrophobic molecules cross cell membranes?
Yes, large hydrophobic molecules can cross cell membranes through passive diffusion.
What are proteins found in cell membranes that transport large molecules?
carrier molecules
Large biological molecules known as lipids?
Lipids are a diverse group of large biological molecules that are insoluble in water. They include fats, oils, phospholipids, and steroids, and serve various functions in the body such as energy storage, cell membrane structure, and signaling molecules. Lipids are composed of carbon, hydrogen, and oxygen atoms in varying ratios.
What type of bonds do large biological molecules make?
Large biological molecules typically form covalent bonds to create stable structures. These bonds involve the sharing of electrons between atoms, providing strength and stability to the molecules. Examples of covalent bonds in biological molecules include peptide bonds in proteins and phosphodiester bonds in nucleic acids.
What kind of substances do protein channels allow to cross membranes?
Ions and large molecules
The large diversity of shapes of biological molecules is possible because of the extensive presence of?
The large diversity of shapes of biological molecules is possible because of the extensive presence of functional groups. Functional groups are specific groups of atoms within molecules that confer unique chemical properties and reactivity. These functional groups can interact with each other and with other molecules through various types of chemical bonds, leading to the wide array of shapes and structures seen in biological molecules.
What biochemical term is used to describe large numbers of molecules joining together?
Polymerization is the biochemical term used to describe the process of large numbers of molecules joining together to form a polymer. This process is important in various biological and chemical reactions, leading to the formation of complex macromolecules with specific functions.
What must you remove to synthesize large biological molecules?
To synthesize large biological molecules like proteins or DNA, you must remove water molecules in a process called dehydration synthesis. This reaction involves a condensation reaction where a hydroxyl group (-OH) and a hydrogen atom (-H) are removed to form a covalent bond between the molecules, resulting in the formation of a larger biomolecule.
Thyroxine molecules are too large to pass through the plasma membranes of their target cells?
false- small
What substance is used to break down large organic molecules?
Enzymes are biological molecules that catalyze chemical reactions, breaking down large organic molecules into smaller molecules. They are commonly used in biological processes to facilitate digestion and cellular metabolism.
What substances normally fail to cross cell membranes under any circumstances?
Large molecules such as proteins and polysaccharides typically do not cross cell membranes. Additionally, charged ions like sodium (Na+) and chloride (Cl-) may have difficulty passing through cell membranes due to their charge.
What large molecules use proteins to help move across cell membranes?
Large molecules such as glucose, amino acids, and ions use transporter proteins to help facilitate their movement across cell membranes. These proteins provide a channel or carrier to help these molecules pass through the membrane, overcoming the barrier imposed by the lipid bilayer.
