Which of the following statements about nucleic acid probes is false?
A) A nucleic acid probe is a double-stranded DNA molecule.
B) A nucleic acid probe can be used to find a specific gene.
C) A nucleic acid probe binds to a complementary sequence in the gene of interest.
D) A nucleic acid probe is usually labeled with a radioactive isotope or fluorescent tag to help identify its location.
Answer: A
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Centrioles, cilia, flagella, and basal bodies have remarkably similar structural elements and arrangements. Which of the following hypotheses is most plausible in light of such structural similarities?
A) Cilia and flagella arise from centrioles. B) Loss of basal bodies should prevent cells from dividing in two. C) Motor proteins such as dynein must have evolved before any of these four kinds of structure. D) Cilia and flagella evolved separately in the same ancestral eukaryotic organism. E) Natural selection for cell motility repeatedly selected for microtubular arrays in circular patterns in the evolution of each of these structures.
Endophytes that colonize leaves to feed on the dead tissue are examples of
A. decomposers. B. detritovores. C. producers. D. herbivores. E. carnivores.
The process of using just enough heat to kill most (but not all) of the bacteria that cause spoilage in a beverage was developed by
a) Pasteur. b) Ehrlich. c) Lister. d) Koch.
Sea stars belong to the
A. Holothuroidea. B. Echinoidea. C. Asteroidea. D. Crinoidea.