What seagoing technology changed the course of navigation methods by providing an accurate means to determine the longitude of a ship?
a. Sextant
b. Celestial charts
c. Chronometer
d. GPS
c
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What characteristic would the R groups of amino acids have if they are located within the interior of biological membranes?
A. The R groups would be able to form ionic bonds. B. The R groups would be polar. C. The R groups would hydrophobic. D. The R groups would be hydrophilic. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you know about proteins in membranes? How does it relate to the question? Consider Possibilities · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Some people are unable to properly metabolize the drug Purinethol, which is given to patients with acute lymphoblastic leukemia; therefore, such patients must be first tested for the associated genetic variant to determine proper dosage of the drug. This scenario best illustrates the use of _____
a. pharmacogenomics b. map-based sequencing c. positional cloning d. annotation of DNA sequences e. comparative genomics
The vision loss associated with glaucoma is most accurately explained by
A. detachment of the retina from the outer part of the eye. B. intraocular pressure buildup due to poor drainage of the aqueous humor. C. loss of photoreceptors in and around the fovea. D. protein accumulation in the lens. E. poor control of extraocular muscles.
At rest, neurons exhibit a negative membrane potential. Among the factors that maintain this polarity, assess which is most DIRECTLY responsible for the difference between intracellular and extracellular ion concentrations?
A. passive leakage of K+ ions across the membrane. B. movement of K+ ions through voltage-gated K+ channels. C. passive leakage of Na+ ions across the membrane. D. movement of Na+ ions through voltage-gated Na+ channels. E. movements of negatively charged proteins and nucleic acids across the membrane.