Hershey and Chase used radiolabeled macromolecules to identify the material that contains heritable information. What radioactive material was used to track DNA during this experiment?
(a) 3H
(b) 14C
(c) 35S
(d) 32P
(d)
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The afferent neuron in the knee-jerk reflex is the:
A. stretch receptor sensory neuron. B. extensor muscle motor neuron. C. flexor muscle motor neuron. D. spinal interneuron.
The ____ method of determining population size is often used to estimate the population size of
mobile animals that live within a restricted geographic range.
a. mark-release-recapture b. direct count c. extrapolation of counts from quadrants to entire population d. plot e. indirect count
Select all accurate statements regarding introduced and invasive species.
A. A semelparous introduced species is less likely to become invasive than an iteroparous introduced species. B. Most populations of invasive species will be brought under control by natural enemies. C. Introduced species are brought to a new area purposefully, while invasive species arrive accidentally. D. Most introduced species will eventually become invasive species. E. Invasive species are often better competitors than the native species that overlap with their ecological niche.
Helicobacter pylori produces (cytotoxin/hyaluronidase/urease), a unique virulence factor important to colonizing the digestive system.
Fill in the blank(s) with the appropriate word(s).