Darker bodies located in the nucleus of some cells are called
A. mitochondria.
B. Golgi bodies.
C. nucleoli.
D. nucleus.
C. nucleoli.
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The progressive accumulation of toxins such as DDT in higher trophic levels is known as
a. biological magnification. b. toxic ascension. c. metabolic compensation. d. tolerance deficit. e. secondary productivity.
As the result of exposure to a mutagen, cytosine is substituted for thymine in one strand of DNA. Upon subsequent DNA replication, one of the daughter cells will have a GC pair in this position instead of an AT pair. This is called a(n) ________ mutation.
A. transversion B. frameshift C. insertion D. transition
There are exceptions to the general rule that amphibians lay eggs that develop in the water. These exceptions show extreme variation but they do have one thing in common. What is it?
A. They all develop in a camouflaged environment. B. They all develop in some sort of pouch. C. They all develop in desert environments. D. They all develop in habitats with adequate humidity. E. They all develop more slowly than eggs developed in water.
Which characteristic distinguishes growth factors from other micronutrients?
a. Cells are unable to biosynthesize them. b. They are essential for growth. c. They have only monovalent ions. d. They have an organic composition.