Phenotype is ____
a. only expressed in a heterozygous organism
b. an observable property or expression of a trait in an organism
c. the specific genetic constitution of an organism
d. the variation of genes
e. cannot be determined by knowing genotype
ANSWER: b
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Shiga toxin is dangerous to humans because it is an _____
a. endotoxin that kills cells b. endotoxin that illicit an immune response c. exotoxin that interferes with protein synthesis by intestinal cells d. exotoxin that disrupts nerve cell function e. exotoxin that can overwhelm the immune response and decrease blood pressure
Which genes guide the formation of specific body parts during embryonic development?
a. homeotic b. homologous c. recessive d. dominant e. homozygotic
The eastern meadowlark and the western meadowlark are two bird species that look very similar to each other. Why do biologists not consider them the same species?
A) Species are not determined by appearance but by their ability to interbreed naturally. B) The two species do not live in the same habitat and thus do not interbreed in nature. C) The two species experience the reproductive barrier of habitat isolation. D) All of the above are correct.
While conducting an experiment, you realize that a competitive inhibitor was interfering with your reaction. How could you overcome this problem?
A. add a cofactor to the reaction B. add an allosteric activator to the reaction C. increase the concentration of the correct substrate in the reaction D. add a noncompetitive inhibitor to the reaction