Approximately 200 of the 300 native species of fish in Lake Victoria haven't been observed since the 1960s and are therefore probably extinct
Using the estimate of the background extinction rate, how many species of Lake Victoria fish would one expect to have naturally become extinct during the last 50 years? A) less than 1
B) 1-10
C) 11-50
D) more than 50
A
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Every year a new version of the flu vaccine is made using a mixture of strains. The strains are chosen based on surveillance and analysis by experts from the FDA, WHO, and CDC. For other diseases however, such as varicella (chickenpox), the same vaccine is used continually and repeated vaccinations are not necessary. What do you conclude is the important difference between the influenza virus and the varicella zoster virus with regards to vaccinations?
Different viruses have different properties that affect how the immune system responds to them, and consequently how vaccines must be developed. A. Influenza virus is transmitted through aerosol droplets in the air, while varicella can be transmitted via skin secretions. B. Varicella is attacked by the innate immune system, while influenza is attacked by the acquired immune system. C. Influenza virus has a much higher mutation rate than varicella, leading to frequent antigen changes in the coat proteins. D. Influenza envelope proteins are bound by IgM, while varicella envelope proteins are bound by IgG. Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about varicella zoster and influenza? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
The organism responsible for the majority of neonatal meningitis is ________.
A. Neisseria meningitidis B. Escherichia coli K1 C. Listeria monocytogenes D. Haemophilus influenzae E. Streptococcus agalactiae
The products of an endocrine gland:a
only affect their own tissues. b. can have a digestive function. c. always stimulate the target tissue. d. generally have to travel to reach the target tissue. e. are not produced by cells in organs, such as the heart.
Sulfate-reducing bacteria produce
a. sulfite. b. calcium sulfate. c. hydrogen sulfide. d. iron pyrite.