In some species of sharks, babies hatch from shells within their mother's body. This is an example of
a. oviparity.
b. viviparity.
c. ovoviviparity.
d. budding.
e. fission.
C
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Which definition of evolution would have been most foreign to Charles Darwin during his lifetime?
A) change in gene frequency in gene pools B) descent with modification C) the gradual change of a population?s heritable traits over generations D) populations becoming better adapted to their environments over the course of generations E) the appearance of new varieties and new species with the passage of time
Vasopressin is a hormone that is primarily released when the body is low on water. Release of vasopressin causes the kidneys to conserve water by concentrating urine and decreasing urine output. However, vasopressin also has additional functions in other tissues such as the brain and blood vessels, which are not directly involved in urine production. How could it be possible for vasopressin to trigger different responses in different tissues?
A. Vasopressin binds to the same exact receptor in different tissues, but causes a different conformational change to the receptor in each tissue. B. The kidneys have a receptor for vasopressin, but cells in the brain and blood vessels do not have a receptor for vasopressin. C. Vasopressin can bind to, and act on, different receptor subtypes, leading to different cellular responses in different tissues. D. Vasopressin can be released at different times to result in different effects.
When comparing cell shapes, the presence of which observable structure in plants provided the structural support?
What will be an ideal response?
Dr. Robinson tapped on a patient's knee with the little hammer, but failed to see the usual kick of the patellar reflex. Since this reflex only involves a few neurons, what part of the nervous system might the doctor most likely be concerned about?
A. Parasympathetic nervous system B. Sympathetic nervous system C. Central nervous system D. Peripheral nervous system