Should a genetic abnormality arise, ________ prevent a cell from progressing uncontrollably through the cell cycle.
A. cis-acting elements
B. checkpoint proteins
C. trans-acting elements
D. growth factors
E. Ras's
B. checkpoint proteins
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A mutation in the lacI gene prevents the gene product from binding allolactose. What will the expression level of the operon be in the absence of lactose?
A. no transcription B. postive regulation C. constitutively active D. low level of expression
When a certain form of a trait increases the fitness of the individual, this allele will tend to ____ over time
a. affect the function of vestigial structures b. lead to extinction of the population c. be eliminated from the population d. decrease in frequency in the population e. increase in frequency in the population
Which cancer symptoms include frequent urination especially at night, difficulty in urination, and difficulty emptying the bladder?
A. Testicular B. Prostate C. Uterine D. Penile
In mammals, gas exchange between the air and blood takes place across the walls of the
A. diaphragm. B. pleural membrane. C. trachea. D. gills. E. alveoli.