A researcher is interested in studying gene X, but not gene Y, in Drosophila. What does she need to amplify only gene
X from the Drosophila genome?
a. some prior knowledge of the gene X sequence so appropriate primers can be designed
b. a heat-stable restriction endonuclease
c. restriction endonucleases that cut gene X but not gene Y
d. a cloning vector that has multiple antibiotic resistance genes
e. a cloning vector that will ligate to gene X but not to gene Y
ANSWER: a
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The species extinctions taking place today are being caused by ____ activities
a. human b. volcanic c. plate tectonic d. extraterrestrial e. geothermal
The insertion of how many nucleotides into a genetic
sequence does less damage to the code than the insertion of other numbers of nucleotides? a. 1 b. 2 c. 3 d. 4 e. 5
Most innate immune responses rely on
A. recognition of specific antigens. B. pathogens being engulfed and destroyed. C. plasma cells to secrete antibodies. D. IgM antibodies. E. clonal selection to replicate specific lymphocytes.
DNA polymerases used in PCR
A. must remain active at very cold temperatures. B. include Taq polymerases and Vent polymerase. C. use an RNA template to make complementary DNA. D. are labeled with fluorescent dyes.