A particular mutant was found that produced a protein that was longer lived than its normal protein. Upon sequencing the mutant, the researcher discovered that specific lysine amino acids had been changed to arginines. Propose a model of what this
mutation caused to allow the proteins to be longer lived.
What will be an ideal response?
Proteins are often targeted for degradation by ligating ubiquitin molecules to a protein at their lysine amino acids. As this protein is longer lived and has fewer lysines, then it is reasonable to predict that the mutation prevents ubiquitination at these specific sites that causes it to evade being degraded.
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Which was first on the planet, prokaryotes or eukaryotes?
A. Eukaryotes B. Prokaryotes C. They both appear in the fossil record at about the same time. D. Researchers do not know which group came first
Microbes that do not colonize the human host, but instead are lost rapidly are referred to as _____
Fill in the blank(s) with the appropriate word(s).
Enzyme regulation may occur by several methods. Which of the following is not a means of enzyme regulation?
A) substrate-level phosphorylation B) feedback inhibition C) allosteric regulation D) covalent modification E) saturation
The vertebrate kidney helps to keep the acidity of body fluids constant by varying the amount of hydrogen ions (H+) it secretes into the urine. You can confidently predict that this aspect of kidney function will be controlled by
A) a positive feedback mechanism. B) a negative feedback mechanism. C) nerve impulses from the brain. D) a hormone produced in the kidney itself.