Which of the following is the best method to sterilize heat-labile solutions?

A) dry heat
B) autoclave
C) membrane filtration
D) pasteurization
E) freezing


C

Biology & Microbiology

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In a normal cell, tumor suppressors are responsible for (select all correct choices):

A. increasing the rate of cell division. B. correcting replication errors. C. signaling death in a highly defective cell. D. signaling the initiation of DNA replication.

Biology & Microbiology

What occurs when the Northern Hemisphere is most tilted away from sun and has its shortest day?

a. winter solstice b. summer solstice c. spring equinox d. autumn equinox e. both solstices

Biology & Microbiology

The retina is indicated by the letter ____

a. A b. B c. C d. D e. E

Biology & Microbiology

Soon after the introduction of antibiotics, resistant strains of bacteria that could grow in the presence of particular antibiotics began to evolve. Researchers develop new antibiotics, only to see resistant bacterial strains evolve within a few years. Which of the following explains why resistant strains of bacteria can evolve so quickly?

A. Bacteria have a short generation time. B. Bacteria have a short generation time and can transfer plasmids containing resistance genes via conjugation. C. Bacteria can transfer plasmids containing resistance genes via conjugation. D. Horizontal gene transfer. E. Bacteria have a short generation time and can transfer plasmids containing resistance genes by horizontal gene transfer mechanisms such as conjugation.

Biology & Microbiology