Which of the following statements is true of eukaryotic DNA?
a. A promoter is part of an intron
b. An intron is part of a promoter
c. Introns are sequences of DNA
d. Exons are edited out of pre-mRNA
Ans: c. Introns are sequences of DNA
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Which of the following carry electrical signals AWAY from the CNS?
A. sensory neuron B. motor neuron C. interneuron D. glial cell E. All of these choices are correct
DNA sequencing data suggest that evolutionary changes are related to an accumulation of:
a. changes in DNA nucleotide sequences. b. homologous structures. c. index fossils. d. vestigial organs. e. convergent structures.
The greenhouse effect causes an increase in global temperatures. This increase is due primarily to ________
A) CO2 and other greenhouse gases allowing more solar radiation to penetrate Earth's surface B) CO2 and other greenhouse gases slowing the escape of UV radiation from Earth C) the loss of ozone that trapped cooling UV radiation in the atmosphere D) CO2 and other greenhouse gases slowing the escape of heat from Earth
Which of the following is an acid produced by fermentation?
a. Pyruvic acid b. Lactic acid and propionic acid c. Propionic acid d. Lactic acid e. Ethanol