You discover a new fluorescent protein that emits photons with a wavelength of 600 nm. Which of the following wavelengths of light might excite the protein?
A) 455 nm
B) 590 nm
C) 550 nm
D) all of the above
Ans: D) all of the above
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In humans, ability to roll the tongue (R) is dominant to being unable to roll (r). Having freckles (F) is dominant to having no freckles (f). A freckled tongue-roller could have which of the following genotypes?
A. RRFF B. RrFf C. rrFF D. RRFF and RrFf only E. all of the answer options are correct
Which of the following statements is not true of the two alternative hypotheses for how the force is generated to pull water up the xylem?
A. The pectin gel in which cellulose microfibrils are embedded in the cell wall causes water to flow into a partially dehydrated cell wall by osmosis. B. Water is drawn by capillary action into the spaces between cellulose microfibrils in partially dehydrated cell walls. C. Evaporation out of the stomata causes the cell walls of those cells lining the intercellular air spaces to become partially dehydrated. D. The pectin gel in which cellulose microfibrils are embedded in the cell wall is slightly positive in charge, restricting the diffusion of positively charged ions. E. Water loss to the air causes a decrease in water vapor in the air spaces in the leaf.
Which event may occur in all viruses,
prokaryotes, and eukaryotes? a. duplication b. aneuploidy c. translocation d. mutation e. none of these
In the spring of 1999, six medics were accused of purposely infecting over 400 Libyan children with HIV in a Benghazi hospital
Using the figure above as a prompt, explain how a team of researchers were able to construct and use this phylogeny to convince the Libyan Court to lift its death sentence for the ‘Bulgarian six.' What will be an ideal response?