A cell that neither gains nor loses water when it is immersed in a solution is what?
A. hypertonic to its environment.
B. metabolically inactive.
C. hypotonic to its environment.
D. isotonic to its environment.
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The Km for enzyme Q is 1 × 10-6 M. Q catalyzes the reaction R?S at a velocity of 30 µmole/min when the concentration of substrate is 0.02 M; hence, Vmax is approximately 30 µmole/min
Assuming Michaelis-Menten kinetics is followed, what will the reaction velocity be when [S] is 10-7 M? A. 30 µmole/min B 3.0 × 10-7 µmole/min C. 2.7 µmole/min D. 2.7 × 10-12 µmole/min E. 0.27 µmole/min
A driver gene ____
a. contains a driver mutation that does not affect gene expression b. does not have any effect on cancer progression c. contains a driver mutation that causes apoptosis in normal cells d. contains a driver mutation or is expressed abnormally, conferring a growth advantage to the cell e. is the unmutated form of a proto-oncogene
Prader-Willi syndrome is a genetic disorder involving a partial deletion of chromosome 15q on the paternal chromosome. When both copies of a gene (or chromosome) are functional but only one is expressed, this is an example of __________
A) position effect variegation B) X-inactivation C) genomic imprinting D) histone acetylation E) chromatin modifications
Meiosis may pause at which point in the cycle?
a. after DNA is replicated in S phase but before meiosis I begins b. after meiosis I is complete c. after prophase II d. before telophase II e. after prophase I