Which of the following syndromes has a karyotype with a missing X chromosome?
A. Jacobs syndrome
B. Turner syndrome
C. Williams syndrome
D. Klinefelter syndrome
E. Down syndrome
Answer: B
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You have a polymer of DNA with 10 adenine bases followed by 10 cytosine bases. If that strand bonded to a strand of 20 thymine bases, how would the double helix shape vary from a typical DNA double helix?
A) The double helix would be longer than normal. B) The double helix would be shorter than normal. C) One strand of the double helix would be longer than the other strand. D) The width of the double helix would vary along the length of the strand.
How might absorption of organic compounds into clays assist in their aggregation and organization
into membrane-bound protocells?
a. Clays contain many minerals in extremely thin layers and readily repel ions, forcing multiple chemical interactions. b. Clays are highly structured, contain water, and store potential energy that could drive the chemical reactions forward. c. Clays lack water, forcing the concentration of the organic molecules and thus driving multiple interactions. d. Clays are extremely resistant to temperature changes and thus would insulate the organic compounds from temperature changes in the atmosphere. e. None of the above statements accurately explain clays’ possible roles in the formation of protocells.
An individual never developed otoliths in the inner ear due to a genetic defect. Which one of the following will be impaired as a result?
A) hearing low-pitched sounds B) hearing high-pitched sounds C) sense of head position and linear acceleration D) maintenance of balance E) sense of rotational movement
Mannitol salt agar (MSA) only allows the growth of halophiles (salt-loving microbes). Among the halophiles, mannitol fermenters release acid that turns the pH indicator yellow; mannitol nonfermenters leave the medium red. Onto MSA you inoculate a halophilic mannitol nonfermenter and a nonhalophilic mannitol nonfermenter. Here the medium acts as a ________ medium.
A. enrichment B. selective and differential C. selective D. differential