Lymphogranuloma venereum is a sexually transmitted disease caused by distinct strains of ________
A) Chlamydia trachomatis
B) herpes simplex 2 virus (HSV-2)
C) Neisseria gonorrhoeae
D) Haemophilus ducreyi
Answer: A
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Girdling is the process by which bark is removed from the entire circumference of a tree or branch. This is lethal to a
tree because it prevents ____.
a. water uptake b. photosynthesis c. respiration d. sugar transport to roots e. water transport to leaves
With each change in trophic level we can expect a ____% transfer of biomass
a. 5 b. 10 c. 25 d. 50 e. 20
Which of the following diseases has gene
therapy been successful in curing?
a. AIDS b. SCIDS c. diabetes d. hemophilia A e. more than one of these
If the bacterium Staphylococcus aureus experiences a cost for maintaining one or more antibiotic-resistance genes, what would happen in environments that lack antibiotics?
A) These genes would be maintained in case the antibiotics appear. B) These bacteria would be outcompeted and replaced by bacteria that have lost these genes. C) These bacteria would try to make the cost worthwhile by locating and migrating to microenvironments where traces of antibiotics are present. D) The number of genes conveying antibiotic resistance would increase in these bacteria.