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Question
Which statement exemplifies the biological pump concept?A) Autotrophs bring in light photons to synthesize ATP.
B) Bacteria oxidize Fe2+ into Fe3+, and Archaea reduce Fe3+ back into Fe2+.
C) Calcium ions are brought into cells while toxic physiological byproducts are released.
D) Primary producers sink to the deep ocean, which provides deep ocean organisms with nutrients when the primary producers die.
Answer
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Related questions
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D) pustule.
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The most common infectious disease(s) is/are
A) gonorrhea.
B) influenza.
C) hepatitis.
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Which disease causes over 1.6 million deaths per year worldwide, which is approximately 11% of all deaths related to infectious diseases?
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Which of the following is the causal agent of gastric ulcers?
A) Staphylococcus aureus
B) Escherichia coli O157:H7
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Which of the following statements about chlamydial infections is TRUE?
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D) All of the statements are true.
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The Spanish flu of 1918 was caused by an ________ influenza virus.
A) H2N1
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D) H2N2
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Diseases can be controlled through immunization even if the percentage of the population that is immunized is less than 100% because
A) vectors can be controlled through other means.
B) most diseases lack reservoirs.
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In just over a decade of efforts, the World Health Organization (WHO) eradicated smallpox by using worldwide
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In 2003, the majority of AIDS deaths occurred in
A) South America.
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The study of the occurrence, distribution, and determinants of health and disease in a population is the field of
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Filoviruses (such as Ebola virus) that cause severe hemorrhagic fevers generally have high ________ but low ________.
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B) prevalence / mortality
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D) morbidity / mortality
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Cholera is an example of a pandemic disease that
A) has multiple wild animal reservoirs and is thus difficult to eradicate.
B) spreads from a common source and could be controlled with adequate clean water and waste sanitation measures.
C) is spread through direct contact and has only a human reservoir.
D) has recently emerged due to overcrowding in urban centers.
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Influenza pandemics occur cyclically because
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C) the vector is seasonal.
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B) can be virtually any pathogenic bacterium or virus.
C) are eukaryotic rather than prokaryotic.
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A) Self-activation
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Which of the following is involved in B cell selection and tolerance?
A) clonal anergy
B) clonal deletion
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Q:
An individual usually expresses ________ structurally distinct allele(s) that encode class I MHC proteins.
A) one
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C) four
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