A blood test cannot determine if a person is a carrier of Tay-Sachs disease because the mutant allele is undetectable
a. True
b. False
False
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Phosphofructokinase is an allosteric enzyme that catalyzes the conversion of fructose 6-phosphate to fructose 1,6-bisphosphate, an early step of glycolysis. In the presence of oxygen, an increase in the amount of ATP in a cell would be expected to _____
A) inhibit the enzyme and thus slow the rates of glycolysis and the citric acid cycle. B) activate the enzyme and thus slow the rates of glycolysis and the citric acid cycle. C) inhibit the enzyme and thus increase the rates of glycolysis and the citric acid cycle. D) activate the enzyme and thus increase the rates of glycolysis and the citric acid cycle. E) inhibit the enzyme and thus increase the rate of glycolysis and the concentration of citrate.
Being heterozygous for the hemoglobin gene variant that causes the disease sickle-cell anemia can be advantageous in what situation?
A. in areas where malaria is endemic B. when iron intake is too low in the diet C. in elite athletes because it slightly decreases oxygen affinity D. when a person has anemia caused by other factors E. when a person is at high altitude
The transgenic mouse models for amyotrophic lateral sclerosis (ALS) and Huntington disease show symptoms similar to those seen in humans affected by these conditions
a. True b. False Indicate whether the statement is true or false
What is the pathway of sperm from production to ejaculation?
A) seminiferous tubules, epididymis, vas deferens, urethra B) epididymis, vas deferens, urethra, seminiferous tubules C) epididymis, urethra, seminiferous tubules, vas deferens D) epididymis, seminiferous tubules, vas deferens, urethra