Explain how amino acid catabolism leads to the production of ammonia and urea
What will be an ideal response?
Amino acid catabolism begins in the liver with deamination by the process of transamination, which yields a carbon skeleton and the amino acid glutamate. The carbon skeleton is converted into a variety of compounds that are fed into glycolysis or the citric acid cycle. Glutamate is deaminated and the ammonia enters the urea cycle to produce urea, which is eliminated from the body by the kidneys.
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All of the following are innervated by the facial nerve (N VII) except for the ________ muscle
A) risorius B) orbicularis oculi C) levator palpebrae superioris D) mentalis E) temporoparietalis
The regulation of sodium ________.
A) is due to specific sodium receptors in the hypothalamus B) is linked to blood pressure C) involves aldosterone, a hormone that increases sodium excretion in the kidneys D) involves hypothalamic osmoreceptor detection of ion concentration
An example of multiple-allele inheritance is ________
A) hair that seems to have several shades of a color B) the appearance of birthmarks on the skin C) the appearance of freckles on the skin D) the ABO blood group
When a hormone binds to a membrane-bound receptor,
A. cellular DNA is altered. B. messenger RNA is formed. C. cyclic GMP might be produced to act as an intracellular mediator. D. the nucleus is phosphorylated to prevent G-protein activation. E. membrane channels are destroyed.