How is the color of each of the major photosynthetic pigments (chlorophyll a, chlorophyll b, carotenes, and xanthophylls) related to the light wavelengths absorbed by that pigment?
What will be an ideal response?
Each pigment absorbs a different wavelength of visible light. For example the carotenes will absorb a wavelength between red and yellow.
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Suppose you are provided with an actively dividing culture of E. coli bacteria to which radioactive thymine has been added. What would happen if a cell replicates once in the presence of this radioactive base?
A) One of the daughter cells, but not the other, would have radioactive DNA. B) Neither of the two daughter cells would be radioactive. C) All four bases of the DNA would be radioactive. D) Radioactive thymine would pair with nonradioactive guanine. E) DNA in both daughter cells would be radioactive.
In a tropical forest some leaves are dark green
and some are light green. In a population of caterpillars, homozygous dominant dark green caterpillars thrive eating the green foliage; homozygous recessive light green caterpillars thrive eating light green foliage; heterozygous caterpillars of an intermediate color green are easily seen by birds and eaten, thus there frequency is far less than the dominants or recessives. This is an example of ___ selection.
a. directional b. stabilizing c. disruptive d. frequent e. mutational
Which of the following specimens should NOT be refrigerated if it cannot be processed immediately?
A. CSF B. Sputum C. Wound swab D. Urine
The process of generating monoclonal antibodies is labor-intensive and expensive. An alternative is to use polyclonal antibodies. A subpopulation of purified polyclonal antibodies that recognize a particular antigen can be isolated by chromatography
Which type of chromatography is used for this purpose? (a) affinity (b) ion-exchange (c) gel-filtration (d) any of the above