Which of the following explains why normal cells grown in a petri dish tend to stop growing once they have covered the bottom of the dish?
A) The cells lack cyclin.
B) Contact with other cells stops cell growth.
C) The petri dish inhibits cell growth.
D) Most cells grown in petri dishes have a defective p53.
Ans: B) Contact with other cells stops cell growth.
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Which one of the following statements about intracellular transport is true?
A. Microtubules and microfilaments facilitate cellular movement, but intermediate filaments do not. B. Microtubules and intermediate filaments facilitate cellular movement, but microfilaments do not. C. Intermediate filaments and microfilaments facilitate cellular movement, but microtubules do not. D. Intermediate filaments, microfilaments, and microtubules all facilitate cellular movement of one kind or another.
The raised ridge at the edge of the glans of a penis is called the _____.
A. corona B. shaft C. meatus D. perineum
The migratory neural crest cells _____
A) form most of the central nervous system B) form the spinal cord in the frog C) form a variety of neural and non-neural structures D) form the lining of the lungs and of the digestive tract
The most common nematode infection worldwide is (ascariasis/filariasis/pinworms).
Fill in the blank(s) with the appropriate word(s).