A polypeptide has 115 amino acid residues. Which two values show the lengths predicted if the polypeptide is an ? helix as compared to a continuous ? strand?
A. 621 Å, 403 Å
B. 414 Å, 403 Å
C. 173 Å, 403 Å
D. 414 Å, 201 Å
E. 173 Å, 210 Å
C
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Which of the following are characteristics of arthropods?
1. protostome development 2. bilateral symmetry 3. a pseudocoelom 4. three embryonic germ layers 5. a closed circulatory system A) 1 B) 1 and 2 C) 1, 2, and 4 D) 2, 3, 4, 5 E) 2 and 3
Which of the following would be an advantage of using a light microscope instead of an electron microscope?
a. Light microscopes, because they use light, offer greater resolution than electron microscopes. b. Light microscopes are designed to offer more magnification than electron microscopes. c. Living cells can be examined with a light microscope. The method of preparing cells for an electron microscope kills the cells. d. With a light microscope, both the surface characteristics and the internal characteristics of a cell can be examined and no special stains are required.
The use of the binomial system of nomenclature was developed by
A. Linnaeus. B. Lamarck. C. Oparin. D. Taxa.
If a microbiologist is studying a specimen at a total magnification of 950X, what is the magnifying power of the objective lens if the ocular lens is 10X?
A. 85X B. 950X C. 100X D. 95X E. 850X