Where is the dirt? A micro student looking through his microscope observed a small, spherical object. The student felt something must be wrong since he was looking at a slide of Spirogyra. His lab partner suggested maybe it was dirt? He rotated his ocular lens to see if the speck would rotate. It did not rotate. What should he check next?
A) Clean the objective lens
B) Clean the ocular lens
C) Adjust the diaphragm
D) Adjust the condenser
A) Clean the objective lens
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Which of the following statements about adhesion molecules is false?
A. Cadherins and pectins are both transmembrane proteins. B. Cadherins and integrins provide the molecular mechanisms for adhesion in animals, but not plants. C. Cadherins adhere adjacent epithelial cells to one another. D. Integrins bind epithelial cells to the extracellular matrix. E. Pectins are found in plant tissues, but not animal tissues.
Chelicerae function as
A. eyes. B. fangs or pincers. C. jaws or mandibles. D. teeth. E. wings.
The germ layers are formed during which developmental stage?
a. cleavage b. meiosis c. gastrulation d. zygote formation e. blastula formation
From the perspective of diversity, within a region, distributions of species should reflect:
A) distribution of suitable habitats. B) ability to disperse to a particular locality. C) both A and B D) neither A nor B