If each nucleotide coded for a single amino acid, how many different types of amino acids could be
combined to form proteins?
a. 4
b. 16
c. 20
d. 64
e. 0
A
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Cellular division within the eukaryotic cells requires DNA to condense into the:
A. 30-nm chromatin fiber. B. 1400-nm chromatin fiber. C. 300-nm chromatin fiber. D. 2-nm chromatin fiber. E. 44-nm chromatin fiber.
?A senescent cell is metabolically active but cannot divide because it has sustained some type of damage.
a. true b. false
Which wavelengths are absorbed by the ozone layer high in the atmosphere?
a. visible wavelengths of electromagnetic radiation b. longer wavelengths of electromagnetic radiation c. any wavelength of electromagnetic radiation d. shorter wavelengths of electromagnetic radiation
________ and ________ BOTH contain inverted repeats and encode transposase
a. F plasmids / R plasmids b. Bacteria / Archaea c. Temperate phages / defective phages d. Insertion sequences / transposons