What can RNA do that DNA cannot that makes RNA a good starting point for life? What will be an ideal response?
ANSWER: Both RNA and DNA can store genetic material. But, only RNA can catalyze reactions, thus
letting it serve as both hereditary material and enzyme. This would simplify the necessary
reactions of the earliest cells.
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Outline the three levels of defense of humans against the invasion of pathogens. What will be an ideal response?
Which of the following would be an effective approach to a new cancer therapy?
A. finding a way to stabilize p53 specifically in tumor cells B. preventing nucleotide synthesis in tumor cells C. inactivating the HER2 receptor on tumor cells D. inhibiting growth of new blood vessels with endostatin E. All of the above would help to fight cancer.
An organic compound gains an electron from another molecule. The organic compound
A) has been oxidized. B) is an electron donor. C) has been reduced. D) has become more positively charged. E) has lost a hydrogen atom.
Low contrast specimens are made easier to see by
A) increasing the amount of light passing through the slide. B) using dyes that react with their structures. C) adding color filters to the microscope. D) using smaller aperture lenses. E) drying them in a vacuum.