A single-ring nitrogenous base found in DNA and RNA
What will be an ideal response?
Cytosine (C)
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Hydrogen bonds are not as strong as ionic or covalent bonds, but they are able to hold the DNA double helix together because
A) there are so many of them. B) the hydrogen bonds in DNA differ from hydrogen bonds in other molecules. C) the hydrogen bonds in DNA also have a very special type of molecular glue. D) ten of them form between each DNA base pair.
What is the most common fatal genetic disorder in the U.S.?
a. Cystic fibrosis b. Huntington's disease c. Parkinson's d. Diabetes e. Down's syndrome
If asked to give an example of an endotherm, you would lose points if you wrote
A. rattlesnakes. B. rabbits. C. pigeon. D. mice. E. turkey.
Which of the following describes a cytotoxic autoimmune reaction?
A) Antibodies react to cell-surface antigens. B) Antibodies are not made. C) Cells are killed. D) Immune complexes form. E) Mediate by T cells.