Which of the following is bacteriostatic?
simple boiling
pasteurization
freezing
nonionizing radiation
freezing
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Which statement about the reductive division of meiosis is false?
A. During the reductive division, homologues migrate to opposite poles of the cell. B. During the reductive division, sister chromatids migrate to opposite poles of the cell. C. During the reductive division, centromeres do not divide. D. At the end of the reductive division, each daughter nucleus has one-half as many centromeres as the parental nucleus.
Which of the following represents an abundant element found in living organisms?
A. calcium. B. iron. C. iodine. D. hydrogen. E. sodium.
In lichens, the fungi send projections of their hyphae across the algal cell wall in order to obtain nutrients from the photosynthetic partner. These projections are called
A. hyphal extensions. B. lichenthropes. C. haustoria. D. mycelia.
Which nitrogenous bases are considered purines?
a. thymine and cytosine b. adenine and cytosine c. thymine and adenine d. adenine and guanine