In the lac operon, the protein that binds to the operator to prevent transcription is?
A. RNA polymerase.
B. DNA polymerase.
C. the repressor.
D. the promoter.
E. lactose.
Ans: C. the repressor.
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Pulmonary circulation is a ________ resistance and ________ pressure pathway.
A. high; low B. low; high C. high; high D. low; low
Which of the following is the portion of the endometrium that lies between the embryo and the stratum basalis?
a) Decidua basalis b) Decidua capsularis c) Decidua parietalis d) Lamina propria e) Adventitia
The serous fluid within the pericardial cavity works to
A. lubricate membranes of the pericardium. B. slow the heart rate. C. equalize the pressure in the great vessels. D. eliminate blood pressure spikes. E. All of the choices are correct.
The proximal tubule
a. reabsorbs about 65% of the filtered water. b. is the site of action for vasopressin c. is the location where glucose is secreted d. lies between the loop of Henle and the collecting ducts e. none of these answers.