How does a cDNA library differ from a genomic library? How are cDNA libraries significant to the
production of eukaryotic gene products? What will be an ideal response?
Concepts to Consider: cDNA libraries contain DNA that was produced from mRNA templates using
the enzyme reverse transcriptase. As such, these cDNA libraries are devoid of the introns that would
characterize the true gene as it would occur on an intact chromosome. A genomic library contains
DNA fragments that may include segments of functional genes, including exons, introns, and
regulatory DNA sequences. Genomic libraries are produced by inserting DNA sequences into the
genome of a suitable vector. cDNA libraries are useful because gene products can be directly produced
from them using RNA polymerase and the translational machinery of a suitable cell such as E. coli.
The lack of introns means that the gene products will be functional proteins.
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Which statement about rods and cones in the eye is correct?
a. Cones respond to particular wavelengths (colors) of light, while rods perceive light at low intensity without color perception. b. Rods respond to particular wavelengths (colors) of light, while cones perceive light at low intensities without color perception. c. Cones are more sensitive to single photons of light than rods. d. Nocturnal animals have a high concentration of cones and relatively few rods. e. Humans have approximately equal numbers of rods and cones, but the cones are primarily localized in the fovea.
The Cretaceous and Jurassic periods are part of the era.
A. Mesozoic B. Cenozoic C. Archean D. Proterozoic E. Paleozoic
After yet another patron dripped sweat on her desk, the clerk at the gym complained, "It's gross working at a gym, with everyone sweating all the time." "Yes," the manager replied, "and it's probably costing us more for ________, but I'll bet we're saving on ________."
A. the water cooler; towels B. weight machines; treadmills C. towels; heating D. the water cooler; air conditioning
The lymphatic ducts will empty directly into the _?_.
A. heart B. subclavian veins C. thoracic veins D. brachiocephalic veins