Small internal cell structures are best visualized with a ________.
A. flagellar microscope
B. transmission electron microscope
C. light microscope
D. dark-field microscope
Answer: B
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The innermost membrane layer surrounding the brain and spinal column is the:
a. dura mater. b. meninges. c. arachnoid. d. pia mater.
The ________ is an organelle in which some of the proteins synthesized on ribosomes and rough ER are modified and packaged
Fill in the blank(s) with correct word
The function of the "ciliary escalator" is to
A) propel inhaled dust and microorganisms toward the mouth, away from the lower respiratory tract. B) remove microorganisms from the gastrointestinal tract. C) remove microorganisms from the lower respiratory tract. D) trap microorganisms in mucus in the upper respiratory tract. E) trap inhaled dust and microorganisms in mucus and propel it away from the lower respiratory tract.
Which of the following elements is least abundant in living organisms?
(a) sulfur (b) carbon (c) oxygen (d) nitrogen