Exocrine glands:a
have a duct.
b. cannot secrete mucus.
c. are made of endothelial tissue.
d. secrete hormones.
e. transport products through interstitial fluid.
a
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Although a useful test in the past, the particle agglutination assay for the detection of H. influenzae, type b, capsular polysaccharide antigen is no longer reliable because of:
a. insufficiently high concentration of the organisms in clinical infections. b. a lack of sensitivity and specificity of the test procedure. c. the frequent use of antimicrobial therapy before collecting the specimen. d. the increased use of H. influenzae, type b, vaccination.
The concept being portrayed in this image is
1.an art-scape.
2.body parts.
3.a PET (position emission tomography) scan showing the differences in body organs between a smoker and nonsmoker.
4.night-vision pictures taken with a normal camera.
Which of the following is NOT evidence to support the endosymbiotic theory of the origin of mitochondria?
A. Mitochondria are produced from the host cell's DNA, which may have been derived when a segment of the engulfed cell's DNA was inserted into the host cell's genome. B. The mitochondrial ribosomes closely resemble bacterial ribosomes. C. Mitochondria are about the size of a proteobacterium. D. Mitochondria display a double membrane that is similar in structure to the plasma membrane of living cells.
Mass extinctions
A. have occurred at least 5 times throughout Earth's history. B. may have been due to climatic changes after a metorite collision. C. may have followed continental drift. D. All of the choices are correct.