Hershey and Chase experimented with radioactively labeled phosphorus and sulfur to determine that DNA and not protein is the genetic material. Which of the following would NOT be an essential part of this experiment?
a. Sulfur is present in amino acids in the protein coat of bacteria.
b. Phosphorus is present in high amounts in DNA.
c. Sulfur is not present in DNA.
d. Phosphorus is not present in amino acids in the protein coat of bacteria.
e. DNA contains nitrogen.
e. DNA contains nitrogen.
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B cells are more effective than macrophages in presenting antigens to activate T cells when
A. antigen concentrations are low. B. macrophages are in short supply. C. antigen concentrations are high. D. None of the choices are correct.
Of the 13 essential vitamins, ____ are water soluble and ____ are fat soluble
a. 3; 10 b. 4; 9 c. 5; 8 d. 9; 4 e. 10; 3
The double helix of DNA is composed of building blocks called
amino acids. monosaccharides. phospholipids. disaccharides. nucleotides
Characters such as height, weight, and skin color are controlled by many genes acting together. These are examples of:
A) multiple alleles. B) codominance. C) polygenic inheritance. D) incomplete dominance.