Why do soybeans, corn, cotton, and canola dominate the GM crop market?
a. They are inexpensive to produce.
b. They are the only GMO crops approved since the Flavr Savr tomato.
c. They are exempt from U.S. regulations.
d. They are ingredients in processed foods, so they are more easily accepted.
e. These crops help to feed and clothe the poor.
Answer: d. They are ingredients in processed foods, so they are more easily accepted.
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A promoter is a regulatory region located at the ____
a. beginning of a gene b. end of a gene c. beginning of a chromosome d. centromere of a chromosome e. end of a chromosome
In an atom, the electrons are
a. housed within the nucleus. b. moving through the nucleus. c. present in various energy shells. d. usually at rest, but occasionally move. e. positively charged.
Which of the following procedures is used to
amplify DNA in the laboratory?
a. DNA cloning b. reverse transcription c. nucleic acid hybridization d. DNA restriction e. polymerase chain reaction (PCR)
Protein families arise when a protein sequence that generates a stable fold diverges over many generations and acquires new functions. One example of this can be seen in the globin family
Myoglobin is a stable monomeric protein that can help carry oxygen using a heme molecule. Hemoglobin is stable as a tetramer. It also carries oxygen through the use of heme groups, but it is useful over a much more dynamic range of oxygen than myoglobin. The "globin fold" is structurally conserved across these proteins, but the ability to tetramerize arose through genetic drift and natural selection. Provide an explanation for how the globin sequence can change and still produce the same overall fold. Support your explanation by suggesting the location and type of sequence alterations that might have little effect on the overall protein fold, but may favor the formation of a multisubunit protein.