Cilia are built of
A) microorganisms.
B) microfilaments.
C) micronutrients.
D) microtubules.
D) microtubules.
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Which type of bond must be broken for water to vaporize?
A) ionic bonds B) both hydrogen bonds and ionic bonds C) polar covalent bonds D) hydrogen bonds E) both polar covalent bonds and hydrogen bonds
The minimum graded depolarization needed to operate the voltage-gated sodium and potassium channels is indicated by the label _____
A) A B) B C) C D) D E) E
A human heart cell contains chromosomes.
A. 16 B. 4 C. 2 D. 23 E. 46
Vaccination increases the number of _____
A) lymphocytes with receptors that can bind to the pathogen B) epitopes that the immune system can recognize C) macrophages specific for a pathogen D) major histocompatability (MHC) molecules that can present an antigen