Geckos are able to cling to vertical walls due to ____
a. polar covalent bonds
b. van der Waals forces
c. ionic bonds
d. hydrogen bonds
e. nonpolar covalent bonds
ANSWER: b
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Which of the following steps are crucial for the success of a nucleic acid amplification test, such as PCR?
a. Nucleic acid purification b. Fluorescent resonance energy transfer (FRET) c. Melting temperature analysis d. Nucleic acid sequencing
Which animal has radial symmetry, a gastrovascular cavity, and the same opening for the entry of food and expulsion of waste?
a. a cnidarian b. a flatworm c. an annelid d. a mollusk e. a sponge
Which process leads to a net movement of uncharged molecules from a low concentration to a higher concentration?
a. active transport b. osmosis c. facilitated diffusion d. exocytosis
"Striated" is a description that could apply to which kind of animal tissue?
a. Epithelium b. Nervous c. Skin d. Muscl e. Connective