Segmentation is the subdivision of the body into segments or metameres. True segmentation is found in which of the following phyla?
A. Annelida, Mollusca, Arthropoda
B. Echinodermata, Platyhelminthes, Cnidaria
C. Mollusca, Chordata, Annelida
D. Arthropoda, Chordata, Porifera
E. Arthropoda, Annelida, Chordata
E. Arthropoda, Annelida, Chordata
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Which type of microscopy would be preferred for showing fine internal detail of the eukaryotic organelles?
A. Bright-field microscopy B. Transmission electron microscopy C. Scanning electron microscopy D. Fluorescence microscopy
The coronary vessels
a. supply and drain the heart muscle. b. bypass the heart ventricles. c. send blood directly to the lungs. d. are not really necessary because the heart can get its blood supply from the "inside." e. lead directly from the atria to the ventricles.
If there are 4,000 children born to this generation, how many would be expected to have AB blood under the conditions of Hardy-Weinberg equilibrium?
A) 100 B) 960 C) 1,920 D) 2,000 E) 2,400
Which of the following statements if NOT true?
a. Exotoxins are more lethal than endotoxins b. Endotoxins are part of the gram-positive cell wall c. Exotoxins can be neutralized in the blood by antitoxin treatment d. Endotoxins can cause septic shock