Sickle-cell disease is caused by a single mutation in the DNA of a particular gene. A person with this disease has red blood cells that lose their original donut shape and form a sickle shape. People with this disorder suffer from low energy levels, blood clots, and strokes. This is an example of
a. a multifactorial trait.
b. polygenic inheritance.
c. pleiotropy.
d. codominance
Ans: c. pleiotropy.
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What is the difference between genetic dissection and genome sequencing?
A) Genetic dissection reveals information about one gene at a time and genome sequencing reveals information about all the genes in a genome at once. B) Genetic dissection experiments can be accomplished in any species and genome sequencing is only possible in model organisms. C) Genetic dissection depends on the availability of mutations in model organisms and mutations are of no use in the study of genomes by genome sequencing. D) The genetic dissection approach is affordable and genome sequencing is prohibitively expensive.
If all available enzyme molecules are binding substrate and converting it to product as rapidly as possible, the reaction is said to be proceeding at ________ velocity.
A. terminal B. infinite C. optimal D. maximal
The head of the radius is located at the
A. elbow. B. sternum. C. shoulder. D. wrist. E. knee.
From studying ecosystems and biomes, it may seem as if there is complete "bottom up" control, that the producers determine the life and success of the ecosystem. Yet closer examination shows "top down" control by the third trophic level is essential as
well. Evaluate why this is so, citing at least one good example. What will be an ideal response?