What is the function of the lens?
What will be an ideal response?What will be an ideal response?
The lens focuses light on the retina.
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Muscle fibers are basically a collection of
A) synapses. B) muscles. C) sarcomeres. D) connective tissue fibers.
The trillions of cells in a human body are classified into about ____________________ types based on specific variations in structure and function
Fill in the blank(s) with correct word
________ are nerve cell processes that conduct action potentials away from the cell body.
A) Dendrites B) Cell body C) Axon D) Neuroglia E) Neuron
What is the defining characteristic of an allosteric protein?
A. They contain two polypeptide chains, with each being an exact mirror image of the other. B. They contain only one ligand-binding site, but because the specificity is low, many different ligands can bind to it. C. They contain two ligand-binding sites, one that activates the protein when a ligand binds, and the other that inactivates the protein when the same ligand binds. D. They contain more than one ligand-binding site, and noncovalent binding of a ligand to one site alters the shape of other ligand-binding sites. E. They contain no binding sites of their own, but act by modulating the activity of other proteins.