Which is a byproduct of photosynthesis?
a. water
b. light
c. glucose
d. oxygen
e. carbon dioxide
d
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Insects use _____ as a respiratory system
a. integument exchange b. lungs c. tracheal exchange d. gills e. capillary tubes
The DNA-binding proteins of almost all regulatory proteins use one of a small set of shapes that enable them to fit into the DNA major groove. These shapes are called
A. DNA prints. B. structural motifs. C. fingerprints. D. repressors. E. transcriptional domains.
Potable water is water that
A) is considered safe to drink because it is completely sterile. B) contains biosensors. C) contains a dangerous number of microorganisms. D) is transferred from one place to another. E) contains low amounts of microorganisms and is considered safe to drink.
One important difference between covalent and ionic bonds is that:
A) ionic bonds are much stronger than covalent bonds. B) in ionic bonds, two atoms share electrons, whereas in covalent bonds, one atom gives one or more electrons to the other atom. C) in covalent bonds, two atoms share electrons, whereas in ionic bonds, one atom gives one or more electrons to the other atom. D) in ionic bonds, both protons and electrons can be shared, whereas in covalent bonds, only electrons can be shared. E) ionic bonds only occur among water-soluble elements.