A population carries two alleles for a trait in which T is dominant and t is recessive. In the Hardy-Weinberg equation, q2 represents the
A) proportion of homozygous dominant individuals.
B) decrease in heterozygous individuals.
C) proportion of homozygous recessive individuals.
D) increase in homozygous individuals.
E) proportion of heterozygous individuals.
C
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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 can bind to, and act on, different receptor subtypes, leading to different cellular responses in different tissues. B. Vasopressin can be released at different times to result in different effects. C. Vasopressin binds to the same exact receptor in different tissues, but causes a different conformational change to the receptor in each tissue. D. The kidneys have a receptor for vasopressin, but cells in the brain and blood vessels do not have a receptor for vasopressin.
It will take approximately ____ years for
Carbon 14 to be reduced into half of the original substance.
a. 16,000 b. 11,200 c. 8,200 d. 5,370 e. 300
Albumin proteins in human blood function
A) to initiate blood clotting. B) to transport oxygen to target cells. C) to maintain blood volume. D) as electrolytes. E) to attack foreign organisms that enter the blood.
Plasmid DNA having one EcoRI recognition sequence is treated with EcoRI restriction endonuclease. Following gel electrophoresis, how many bands should be visible on the gel?
A. Four B. One C. Two D. Zero