X-ray diffraction images produced by ____ were used by Watson and Crick to infer the structure of DNA
a. Wilkins
b. Griffith
c. Franklin
d. Hershey
e. Watson and Wilkins
c
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In an HIV infection the TH cells and macrophages are NOT commonly infected
Indicate whether the statement is true or false.
Estuaries are an example of:
a. niches. b. populations. c. ecosystems. d. the abyssal zone. e. pelagic systems.
Geneticists can create sequences of DNA from RNA using enzymes called ________.
A. palindromes B. reverse transcriptases C. restriction endonucleases D. ligases E. DNA polymerases
Marina has owned a bar for many years and extols the health benefits of alcohol. Which of these claims is correct?
A) Four to five drinks per day improve the liver. B) Heavy drinking prevents cancer. C) Alcohol increases the uptake of vitamins and minerals. D) Moderate consumption raises the "good" cholesterol levels.