Four of the five answers listed below are barriers to pathogen invasion. Select the exception
a. intact skin
b. mucous membrane
c. gastric juices
d. blood plasma
e. lysozyme
d
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A student dispensed three identical samples of closed circular DNA to three test tubes. Tube A served as a control. Both tubes B and C received equal amounts of type I topoisomerase; however, the reaction in tube C was allowed to incubate longer
When the contents of all tubes were run on a gel, all tubes showed supercoiled DNA with equally minimal amounts of relaxed DNA. The best conclusion the student should make is that the topoisomerase: A. catalyzed the reaction so efficiently, the extra time for tube C wasn't required. B supercoiled the DNA efficiently. C. the topoisomerase relaxed the DNA efficiently. D. was denatured and not working properly. E. was type II, not type I.
A Tampa Bay study demonstrated species diversity and abundance of polychaetes within a square meter was in excess of:
a. 10,000 individuals among 50 species. b. 13,000 individuals among 37 species. c. 50,000 individuals among 50 species. d. 100,000 individuals among 37 species. e. 100,000 individuals among 50 species.
Amphibian and most reptiles have
a. a two-chambered heart with two blood flow circuits. b. a three-chambered heart with two blood flow circuits. c. a four-chambered heart with two blood flow circuits. d. a three-chambered heart with one blood flow circuit. e. a two-chambered heart with one blood flow circuit.
In an ectopic pregnancy, implantation occurs
a. in the oviduct. b. on the outside of the uterus. c. on the abdominal wall. d. on the surface of the ovary. e. anywhere outside the uterus.