Sebum contains ________ which contributes to creating an inhospitable environment on the surface of the body.
A. lysozyme
B. collagens
C. acids
D. salts
E. bile
Answer: C
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Certain meteorites have been examined and found to carry samples of which one of the following?
A. lipids B. amino acids C. photosynthetic bacteria D. lipids and amino acids E. lipids, amino acids, and photosynthetic bacteria
When the protoplast shrinks away from the cell wall, it is called ____
a. plasmolysis b. tight c. wilted d. turgid e. full
Which of the following describes the purpose of the polymerase chain reaction?
a. increasing the number of copies of DNA b. separating charged molecules by size and charge c. opening cells to extract DNA in a gelatinous mass d. cutting DNA sequences in a predictable manner
Gel electrophoresis separates the DNA
fragments according to a. their length. b. their mass. c. their speed of travel through the gel. d. the number of nucleotides in the fragment. e. all of these.