The close grouping of homologous chromosomes in prophase in meiosis I is called a
A. chromatid.
B. tetrad.
C. gamete.
D. zygote.
Answer: B
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The smallest short bone in the hand is the ________
Fill in the blanks with correct word
The conduction velocity of the action potential is affected by
a) The diameter of the axon b) Myelination of the axon c) The number of K+channels in the axon d) Internal resistance of the axon e) All of the above
The two types of cells that make up the nervous system are
A. macrophages and mast cells. B. mast cells and fibrocytes. C. neurons and mast cells. D. neurons and glial cells. E. neurons and chondrocytes.
Nora was exposed to radiation that caused her red bone marrow to make fewer red blood cells. This condition is known as:
A) sickle cell anemia. B) iron-deficiency anemia. C) aplastic anemia. D) hemolytic anemia.