The gene for Tay-Sachs disease codes for a nonfunctional form of the enzyme hexosaminidase A (or Hex A). It has been found that a person with only one-third the maximum amount of Hex A can function absolutely normally. Please characterize the heredity of
Tay-Sachs disease.
A) multiple allelic B) codominant C) dominant D) recessive
Answer: D
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Which of the choices below can be used to correctly begin the following sentence? _______________ have a plasma membrane
A. All cells B. All animal and plant cells, but not bacterial cells, C. All bacterial cells, but not animal and plant cells, D. All plant and bacterial cells, but not animal cells,
An animal virus contains protein, lipid, and DNA. Shown here is the absorption spectra of the three macromolecules purified from the virus. Which of the three samples, A, B, or C, contains DNA?
A. Sample A contains DNA. B. Sample B contains DNA. C. Sample C contains DNA.
Ribosomes are made up of:
A. protein and RNA. B. only protein molecules. C. only RNA molecules. D. DNA and RNA. E. only DNA molecules.
In fish, blood flows in a direction opposite to the flow of water over the gills in a process known as:
a. concurrent exchange. b. countercurrent exchange. c. crosscurrent exchange. d. exhalation. e. diffusion.