Understanding Receptors and Ligands - High School Biology
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Which of the following cannot act as a ligand?
Which of the following cannot act as a ligand?
Ligands bind to receptors, which cause conformational changes and various effects on the cell. Integral membrane proteins span the lipid bilayer. These proteins commonly act as receptors and bind to ligands to produce conformation changes. They cannot leave the lipid bilayer, and thus are never ligands that can bind to other receptors.
Ligands are generally small ions or molecules, such as glucose or triglycerides. Calcium ions act as second messenger ligands in signal transduction. Steroid hormones, like testosterone, bind to proteins in the nucleus to alter transcription patterns. Neurotransmitters bind to receptors on dendrites to cause action potential propagation. Inhibitors can bind to receptors to block other ligands from interacting.
Ligands bind to receptors, which cause conformational changes and various effects on the cell. Integral membrane proteins span the lipid bilayer. These proteins commonly act as receptors and bind to ligands to produce conformation changes. They cannot leave the lipid bilayer, and thus are never ligands that can bind to other receptors.
Ligands are generally small ions or molecules, such as glucose or triglycerides. Calcium ions act as second messenger ligands in signal transduction. Steroid hormones, like testosterone, bind to proteins in the nucleus to alter transcription patterns. Neurotransmitters bind to receptors on dendrites to cause action potential propagation. Inhibitors can bind to receptors to block other ligands from interacting.
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Which of the following includes the four most common groups of ligands in biology?
Which of the following includes the four most common groups of ligands in biology?
In biochemistry, ligands are any substance that forms a complex with a biomolecule to serve a biological purpose. The four primary types of ligands have their functional state determined by their three-dimensional chemical conformation. Tracers in the body often take the form of radioligands, but are not ligands themselves.
In biochemistry, ligands are any substance that forms a complex with a biomolecule to serve a biological purpose. The four primary types of ligands have their functional state determined by their three-dimensional chemical conformation. Tracers in the body often take the form of radioligands, but are not ligands themselves.
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Which of the following is NOT true regarding receptors and ligands?
Which of the following is NOT true regarding receptors and ligands?
Ligands and receptors are both usually proteins. Since proteins can fold into a wide variety of shapes, the receptor-ligand interaction is very specific. In some cases, certain receptors will bind two ligands that are similar in structure. For example, hemoglobin binds to both 
and 
, but binds 
with much higher affinity. Ligands bind receptors using only weak bonds (hydrogen bonds and Van der Waals forces). Depending on the nature of the ligand (whether it can cross the lipid bilayer or not), its receptor may be either on the cell's surface, floating in the cytoplasm, or on the nuclear membrane.
Ligands and receptors are both usually proteins. Since proteins can fold into a wide variety of shapes, the receptor-ligand interaction is very specific. In some cases, certain receptors will bind two ligands that are similar in structure. For example, hemoglobin binds to both
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Chemotaxis refers to movement of an organism in response to which of the following stimuli?
Chemotaxis refers to movement of an organism in response to which of the following stimuli?
Chemotaxis refers to the movement of an organism in response to a chemical stimulus. Single or multicellular organisms may direct their movements according to certain chemicals in their environment. This is important because these organisms need to find food, flee from harmful substances, and chemotaxis also aids in development. Positive chemotaxis is movement towards a higher concentration of the chemical, whereas negative chemotaxis is movement away from the chemical.
Chemotaxis refers to the movement of an organism in response to a chemical stimulus. Single or multicellular organisms may direct their movements according to certain chemicals in their environment. This is important because these organisms need to find food, flee from harmful substances, and chemotaxis also aids in development. Positive chemotaxis is movement towards a higher concentration of the chemical, whereas negative chemotaxis is movement away from the chemical.
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