Electron microscopes have an advantage over light microscopes because
a. electron microscopes allow the viewer to examine living cells.
b. electron microscopes have a larger objective aperture.
c. electron microscopes are easier to use.
d. the wavelength of electrons is shorter than that of light.
Ans: d. the wavelength of electrons is shorter than that of light.
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Why are some proteins synthesized after single-codon mutations still semi-functional?
a. Proteins are transported to the nucleus to be compared to and corrected by the cell’s DNA. b. Degeneracy ensures that all single-codon substitution specify the same amino acids. c. Substituted amino acids may have similar properties as the originally specified amino acids. d. Only the average properties of every amino acid in a protein determine its functionality.
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
Photosynthesis takes place in
A. both plants and animals. B. animals but not plants. C. plants but not animals. D. bacteria only.
Karyotyping
A) shows chromosomes as they appear in metaphase of meiosis II. B) can reveal alterations in chromosome number. C) examines points of crossing over. D) reveals the presence of cancerous genes.