Viruses are the only known infectious agents that are obligatory intracellular parasites
Indicate whether the statement is true or false
FALSE
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The myoglobin protein, which carries oxygen in muscle cells, has only the first three levels of protein structure. What can you infer about myoglobin?
A. Myoglobin is made of nucleic acids B. Myoglobin lacks hydrogen bonds C. Myoglobin is made of only one polypeptide chain D. Myoglobin is not helical or pleated
To maximize the number of thymine dimer mutations following UV exposure, should you keep human cells in tissue culture in the dark, in the light, or does it matter at all?
A. The dark-light will activate the photorepair systems that can break thymine dimers induced by UV light. B. The light-it's important to keep on producing the thymine dimers by keeping the plate exposed to light as much as possible. C. It's best to alternate light and dark every hour to increase the chances that thymine dimers will form in the human cells, but still keep the photorepair systems from correcting them as they are formed. D. It doesn't matter-human cells don't possess the enzymes needed for photorepair of thymine dimers.
A cell that is observed under the microscope is found to have its DNA enclosed in a nucleus, and has other specialized
internal compartments. The cell is a(n) ____.
a. bacterium b. E. coli c. prokaryote d. eukaryote e. archaean
Which protective structure forms to protect certain bacteria during periods of harsh conditions?
A. Biofilm B. Capsule C. Flagella D. Endospore