Blue poppies native to China are grown at a plant-breeding center in California. Those with the thickest leaves survive and reproduce best in California's drier climate. This evolutionary adaptation of the poppies to their new environment is due to __________.
A. genetic drift
B. stabilizing selection
C. directional selection
D. neutral variation
C. directional selection
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According to the current model, which of the following is the correct sequence of microtubule assembly?
A) dimers, oligomers, sheets of protofilaments, protofilaments, closing of microtubule, elongating microtubule B) dimers, sheets of protofilaments, closing of microtubule, oligomers, protofilaments, elongating microtubule C) dimers, oligomers, protofilaments, sheets of protofilaments, closing of microtubule, elongating microtubule D) protofilaments, sheets of protofilaments, closing of microtubule, elongating microtubule, dimers, oligomers E) dimers, oligomers, protofilaments, elongating microtubule, sheets of protofilaments, closing of microtubule
Of the comparisons listed below, which is not true in distinguishing DNA from RNA?
A. DNA is a long double-strand molecule while RNA is a shorter single-strand molecule. B. All of the answer choices are correct. C. DNA and RNA are different in that RNA has uracil instead of thymine. D. DNA has a main function of storing genetic information, while RNA is used to build specific proteins in a cell. E. DNA is a molecule that stores and regulates our genetics, while RNA is used for cellular energy storage and release for biological functions.
One of the findings of the human genome project is that humans vary by
a. introns. b. exons. c. SNPs. d. codons. e. deviant bases.
The influenza virus, a deadly infectious agent found around the world, is composed of _________ and _________.
A. DNA ... RNA B. DNA ... protein C. nucleic acid ... RNA D. RNA ... protein