Endoplasmic reticulum (ER) with many ribosomes attached is called ________ ER, whereas endoplasmic reticulum that is mostly devoid of ribosomes is called ________ ER.
What will be an ideal response?
rough, smooth
rough; smooth
rough smooth
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What passes through the nuclear pores?
A. DNA and RNA B. DNA C. RNA D. Neither DNA nor RNA
Even though the autumn may be unusually warm, the
leaves from deciduous trees begin to drop during September. Which of the following is the best explanation? a. The trees are responding to shorter days. b. The autumn months are usually drier because the summer rains have tapered off. c. The effects of phototropism are operating “right on schedule.” d. There is not enough sunlight to carry on photosynthesis any longer. e. None of these are the best explanation.
Last summer a bee stung you for the first time. You developed only a small area of redness and swelling at the site. However, if you are stung again and have a severe reaction that occurs more rapidly, you know that this is due to the activation of
A) memory cells. B) complement. C) cytotoxic T cells. D) helper T cells. E) tissue macrophages.
Which of the following statements is true of purulent exudate?
What will be an ideal response?