Place the steps of biofilm formation in the correct order.1. Surface (substratum) is preconditioned by environmental molecules.2. Microbes attach and detach from the preconditioned surface.3. Quorum sensing and the establishment of the extracellular matrix commences as microbes attach more stably.4. Biofilm matures and some microorganisms escape to the planktonic state.
Fill in the blank(s) with the appropriate word(s).
1, 2, 4, 3
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Our ability to respond to moderate heat and cold is due to
A. mechanoreceptors. B. thermoreceptors. C. nociceptors. D. electromagnetic receptors. E. chemoreceptors.
Would you expect the number of virions to be the same if you measured them by the plaque assay or by counting using the electron microscope? Why?
A. Yes-both methods measure the total number of virus particles in a solution. B. No-the plaque assay only measures viable virus particles, while the electron microscope cannot distinguish between defective and viable virus. C. No-you cannot count virus particles by using a plaque assay. You can only get a relative difference in quantity from one preparation of virus particles to another with this method. D. Yes-only fully functioning viruses will be released from a host cell, so the quantified number of virus particles in a plaque assay should be identical to the number of free virus particles counted by electron microscopy within a given preparation.
Explain how proteomics is considered by some to be even more important than genome sequencing
What will be an ideal response?
Which type of trait is most likely to have arisen through sexual selection? a. Stronger jaws in snapping turtles
b. Faster running ability in rabbits. c. Elongated eyestalks in Malaysian flies. d. Dark fur in pocket mice. e. Laying three eggs instead of one.