Explain why the prefix homeo- is used in the term homeostasis. Why do some physiologists prefer the term homeodynamics over homeostasis?
What will be an ideal response?
The prefix homeo-, meaning like or similar, is used to indicate that the body's internal environment is maintained within a range of acceptable values rather than a fixed state. Some physiologists argue that the term homeodynamics better reflects the small but constant changes that continuously take place in the internal environment, as opposed to homeostasis, which erroneously implies lack of change.
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Which is NOT true about cofactors involved in enzymatic reactions?
A. They may alter the conformation of the enzyme. B. Only a small number of cofactor molecules may be needed to maintain enzyme activity. C. They may be a metal such as iron. D. There must be equal quantities of enzyme and cofactor molecules for a reaction to proceed. E. They may be a substrate in a catalyzed reaction.
The Na+ and K+ channels that open and close during an action potential are voltage-gated channels
Indicate whether the statement is true or false
Which choice describes the activation steps of a G protein-coupled receptor properly (and in correct order)?
A. Protein kinase activated, ion channel opened, ions enter and activate second messenger, G protein turned on B. Ligand binds to receptor, second messenger activated, G protein turned on, protein kinase activated C. Ligand binds to receptor, G protein activated, effector protein activated, second messenger made available D. Ion channel opened, G protein activated, second messenger synthesized, phosphatase ends signal
Which of the following is a X-linked genetic disorder?
A. Cystic fibrosis B. Tay-Sachs disease C. Hemophilia A D. Huntington disease