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Question
A mechanism for penicillin resistance in bacteria isA) acetylation of the antibiotic.
B) phosphorylation of the antibiotic.
C) confirmation change of the antibiotic.
D) splitting the β-lactam ring of the antibiotic.
Answer
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Related questions
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Which of the following statements about chlamydial infections is TRUE?
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The Spanish flu of 1918 was caused by an ________ influenza virus.
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B) most diseases lack reservoirs.
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In 2003, the majority of AIDS deaths occurred in
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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
C) mortality / morbidity
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.
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Q:
Influenza pandemics occur cyclically because
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B) new strains emerge due to reassortment between bird, swine, and human variants.
C) the vector is seasonal.
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The arrangement of Class II MHC proteins in pairs or trimers enhances their stability.
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C) B7
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________ ensures that each B cell produces only one immunoglobulin.
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
C) clonal anergy and deletion
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Q:
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B) high energy.
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Q:
An individual usually expresses ________ structurally distinct allele(s) that encode class I MHC proteins.
A) one
B) two
C) four
D) six