Briefly define what is meant by negative and positive control of the lac operon
What will be an ideal response?
In negative control, the repressor protein blocks lac gene transcription in the absence of the inducer. In positive control, the catabolite activator protein complexed with cAMP binds to the CAP site in the lac promoter, facilitating the transcription of lac genes.
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Which compounds serve as major sources of energy for ruminant animals?
A) acetic acid and glucose B) acetic, butyric, and propionic acids C) dimethylsulfoniopropionate, gluconate, and protocatechuate D) glucose and sucrose
Immersion oil is used to prevent a specimen from drying out.
Answer the following statement true (T) or false (F)
The bacterium Brucella abortus imports and uses the unusual sugar erythritol. The concentration of erythritol within the B. abortus cell is 10 mM, but the external erythritol concentration is much lower at 0.20 mM
What is the energy requirement (?G inward in kcal/mol) for the inward transport of erythritol at 37°C under these conditions? What will be an ideal response?
If one nephron in the right kidney becomes blocked and unable to function,
A. the kidney would become non-functional. B. the person would die. C. urine formation would not be greatly affected because there are 1.3 million nephrons in each kidney. D. the kidney would no longer be able to create urine. E. the filtration and urination rates would decrease significantly.