Why is the nucleus considered to be the control center of cellular activity?
A. It contains DNA.
B. It has nuclear pores.
C. It contains ribosomes.
D. It has a nuclear envelope.
E. It has a nucleolus.
A. It contains DNA.
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The heart pumps approximately ________ milliliters of blood each minute
A) 6,000 B) 15,000 C) 20,000 D) 50,000 E) 100,000
Most inspired particles such as dust fail to reach the lungs because of the ________.
A) ciliated mucous lining in the nose B) abundant blood supply to nasal mucosa C) porous structure of turbinate bones D) action of the epiglottis
Sister chromatids ___________.
A) contain twice the normal amount of DNA. B) are found in cells called primary gametes. C) are found in cells called primary gametes, contain twice the normal amount of DNA, and occur during ovum formation. D) are found in cells called primary gametes and contain twice the normal amount of DNA. E) occur during ovum formation.
When a neuron starts to depolarize, ____________________ ions move into the cell
Fill in the blank(s) with correct word