Based on genetic comparisons,
a. people of different races often have more genetic similarities than many individuals within a race.
b. humans have a more ancient origin than chimpanzees.
c. there is much genetic diversity among cheetahs.
d. among humans, many genetic variations are restricted to certain racial groups.
e. there is no difference between different races of humans.
A
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A female aphid reproduces parthenogenetically to create a colony of 10 clones of herself. Five of these individuals become "soldiers" and do not reproduce; instead, they defend the other five reproductive individuals from predatory insects
Consider a single soldier and a single reproductive female. From the soldier's perspective, each of that reproductive female's offspring are genetically equivalent to the soldier's own: A. siblings. B. offspring. C. nieces/nephews. D. first cousins. E. grandchildren.
In which organism is genetically engineered human insulin produced?
a. pigs b. E. coli c. humans d. T. aquaticus e. B. thuringiensis
What happens during countercurrent exchange in fishes?
A) Gas exchange occurs as blood and water move in opposite directions across a respiratory surface. B) Gas exchange occurs as blood and water move in the same direction across a respiratory surface. C) Oxygen enters the blood by diffusion, and carbon dioxide exits the blood by active transport. D) Oxygen enters the blood by active transport, and carbon dioxide exits the blood by diffusion. E) Oxygen and carbon dioxide move in opposite directions across the respiratory surface by facilitated diffusion.
________ are a component of the immune system that are able to destroy cancer cells by deploying toxins into infected cells as a means of killing them. In this role they are cytotoxic—that is, "cell killing."
A) Natural killer cells B) Phagocytes C) Antibodies D) B cells