Which of the following is the cause of the STD known as lymphogranuloma venereum?
A. Neisseria gonorrhoeae
B. Haemophilus ducreyi
C. Chlamydia trachomatis
D. Treponema pallidum
E. Chlamydophila psittaci
Answer: C
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What is the effect of stress on a population?
a. Plants compete less with each other in stressful environments. b. Plants compete more with each other in a stressful environments. c. Only abiotic factors contribute to environmental stress. d. Stressful environments brought about by humans do not affect populations. e. Stressful environments brought about by nature do not affect populations.
What is the age of the twig in the accompanying figure?
a. 0 years
b. 1 year
c. 2 years
d. 3 years
e. 5 years
The photosynthetic bacteria that form the basis of the food chain in the Great Salt Lake are classified as
A) carnivores. B) herbivores. C) secondary consumers. D) omnivores. E) producers.
What is the role of memory cells?
A) remain in the lymphoid tissue to rapidly proliferate and differentiate upon subsequent exposure to the same pathogen B) suppress the cellular response once the infection has passed C) circulate in the body at elevated levels to maintain an active attack against any possible pathogen D) prevent an immune response against members of the normal microbiota E) provide immune protection specifically for central nervous system