Following reports that the amount of DNA varied over time within cells, scientists in the early 1900s concluded that the genetic material had to be
A) DNA.
B) RNA.
C) protein.
D) lipids.
E) carbohydrates.
Answer: C
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Which of the following statements is true?
a. The hydrogen bonding of cytosine to guanine is an example of complementary base pairing. b. In DNA, adenine always base pairs with guanine, and cytosine always base pairs with thymine. c. Each of the four nucleotides in a DNA molecule has the same nitrogen-containing base. d. When adenine base pairs with thymine, they are linked by three hydrogen bonds. e. None of these statements are true
Glucose and fructose are different
a. in the number of carbons they possess. b. in their proportion in sucrose molecules. c. in the way that their atoms are arranged. d. in the number of double bonds they possess. e. both in the way that their atoms are arranged and in the number of double bonds they possess.
The prefixes chemo- and photo- describe where an organism gets its
a. energy (in the form of electrons) b. carbon
Archaeal membranes contain which of the following lipids?
A. Glycolipids B. Sulfolipids C. Phospholipids D. All of the choices are correct.