Which of the following molecules would cross the plasma membrane most easily?
a) a small, electrically charged molecule
b) a large, uncharged molecule
c) a small, uncharged molecule
d) a large, electrically charged molecule
Ans: c) a small, uncharged molecule
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The amino acids of the protein keratin are arranged predominantly in an ?-helix. This secondary structure is stabilized by _____
A) covalent bonds B) peptide bonds C) ionic bonds D) polar bonds E) hydrogen bonds
Fungi that can live only in mycorrhizal association with roots of plants may be placed into phylum
A. Symbiomycota. B. Ascomycota. C. Deuteromycota. D. Rootomycota. E. Glomeromycota.
What are plants that flower only once before they die, normally after two seasons of growth, called?
A. monocots B. annuals C. perennials D. dicots E. biennials
Spindles are ___.
A. permanent cell structures B. present throughout every step of mitosis C. present during interphase D. mainly composed of microtubules E. all identical