You decide to go on vacation in the mountains, where you are staying in a cabin. Unfortunately, when you turn on the water in the cabin you smell hydrogen sulfide (H2S) gas. After some research, you find out that the H2S may be due to the presence of sulfur bacteria living in your pipes. What molecule do these bacteria use as an electron acceptor?
A. SO4
B. H2S
C. O2
D. H20
Answer: A
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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.
Which category of organic macromolecule allows myelinated sheaths to act as electrical insulators?
a. proteins b. carbohydrates c. lipids d. RNA e. DNA
As the human body grows to trillions of cells, DNA replication occurs about how many times?
A) one billion. B) three trillion. C) 100 trillion. D) 100 quadrillion.
Enzymes that are regulated by molecules that bind somewhere other than the active site are called ______
Fill in the blank(s) with the appropriate word(s).