Through which of the following structures does urine leave the bladder?
A) ureter
B) urethra
C) renal medulla
D) distal tubule
Answer: B
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A pro- strain of bacteria, which has not been in contact with any other strains, develops the ability to produce the amino acid proline. This mutant "rescue" could have been caused by
A. addition of the pro+ gene via transduction. B. mutation of the pro- gene during phage integration. C. removal of the pro- gene during excision. D. addition of the pro+ gene via transformation. E. correction of the pro- gene by reverse transcriptase.
A single pregnant female parakeet arrives in Hawaii early in its history. After millions of years her
descendants have successfully adapted to a variety of foods and habitats. This is the result of:
a. genetic drift b. adaptive radiation c. a higher rate of mutation d. punctuated equilibrium e. sympatric speciation
Which community type seems to have a higher biodiversity, the prairie dog or the mesquite?
a. prairie dog b. mesquite
The point of constriction on chromosomes that contains certain repeated DNA sequences that bind specific proteins is called
A. the centromere B. the kinetochore C. the cohesin complex D. the centrosome E. the centriole