Which animal taxon is named for the cuticle or external skeleton that its members secrete and periodically molt?
a. Deuterostomia
b. Ecdysozoa
c. Reptilia
d. Lophotrochozoa
e. Protostomia
ANSWER: b
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Which of these methods can be used to determine the number of viable microorganisms in a sample?
A. Light scattering in a spectrophotometer B. Counting a known volume of cells in a hemocytometer C. Measuring colony forming units per ml D. Measuring total cell mass
Continuous phenotypic variations can be explained by Mendelian inheritance
a. True b. False Indicate whether the statement is true or false
Why is human blood clotting factor VIII produced by genetically engineered bacteria better to treat
hemophilia type A than the clotting factor isolated from human or animal blood? a. Recombinantly produced clotting factor has a longer shelf life than natural clotting factor. b. Clotting factor isolated from blood can transmit infectious agents. c. Clotting factor isolated from human blood can cause transfusion reactions. d. Recombinantly produced clotting factor is free of blood thinning factors. e. Natural clotting factor from blood is not very active.
Which of the following is involved in forming the tertiary structure of proteins?
a. H bonds b. Hydrophobic interactions c. Ionic bonds d. All of the above