Why are neurons unable to undergo mitosis in adults?
A. Mature neurons lack centrioles.
B. Neurons lack mitochondria.
C. Mature neurons lack a nucleus.
D. Mature neurons lack chromatophilic substance.
E. Mature neurons lack adequate supplies of cytoplasm for cell division.
Answer: A
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________ are the most numerous type of leukocyte in the blood.
Fill in the blank(s) with the appropriate word(s).
Once a ligand binds to a receptor-enzyme,
A) The catalytic domain interacts with extracellular components. B) The catalytic domain interacts with intracellular components. C) The ligand-binding domain is phosphorylated. D) The ligand-binding domain is dephosphorylated.
This figure shows a posterior view of the right thigh. What muscle does number 2 indicate?
A. Semitendinosus B. Semimembranosus C. Biceps femoris D. Adductor magnus E. Gluteus maximus
Which of the following is not true regarding sickle-cell disease?
A. It is caused by a recessive allele that modifies the structure of hemoglobin. B. It is a cause of malaria. C. It is advantageous in that it can protect carriers against malaria. D. It is due to a hereditary hemoglobin defect. E. It is a cause of anemia.