A DNA molecule containing 32% thymine would contain how much cytosine?
A. 18%
B. 32%
C. 36%
D. 64%
A. 18%
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Water molecules exhibit cohesive and adhesive properties. What is the chemical bond characteristic that contributes to these and other numerous important properties of water molecules?
A. The covalent bond strengths of water molecules change with pH, temperature, or solute conditions present. B. The covalent bonds that form water molecules transform to ionic bonds in presence of other molecules, temperature changes, or pH. C. Hydrogen bonds form between water molecules, not requiring gain, loss, or sharing of electrons. D. Bonds that form water are of the nonpolar covalent form. E. Ionic bonds between water molecules create increased surface tension.
A mountain rain shadow is the
a. arid area on the windward slope. b. wet area on the windward slope. c. arid area on the leeward slope. d. wet area on the leeward slope. e. arid area on either slope.
Which of the following gymnosperm groups has the most efficient water-conducting cells?
a. Coniferophyta b. Ginkgophyta c. Cycadophyta d. Gnetophyta e. Pteridophyta.
What evidence led to Kirk Odom's freedom after being wrongly imprisoned for 30 years?
A) an analysis of blood types from the crime scene B) an analysis of fingerprints from the crime scene C) accounts from witnesses D) an analysis of DNA from the crime scene