B cells are genetically programmed to produce unique antibodies; similarly, T cells are genetically programmed to
produce unique T-cell receptors.
a. True
b. False
True
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The toxin found in Amanita phalloides has deadly effects on humans because it inhibits ____
a. DNA replication b. RNA polymerase c. peptide bond formation d. muscle contraction e. active transport
Which of the following occurs in feedback inhibition?
a. Coenzymes block enzyme activity. b. Products of metabolic reactions block enzyme activity. c. NADH is altered in electron transport chains. d. ADP is phosphorylated. e. Low reactant concentrations decrease enzyme activity.
Which of the following statements is not true about natural selection?
a. Offspring of individuals that are better adapted will make up a larger proportion of the next generation. b. Natural selection directs evolution by preserving traits acquired during an individual's lifetime. c. Natural selection depends on the genetic variability in a population, which arises through mutations. d. Natural selection acts to preserve favorable traits and eliminate unfavorable traits. e. Natural selection leads to adaptive evolutionary change.
The diarrhea associated with enteropathogenic Escherichia coli (EPEC) is the result of Plasmid-mediated A/E histopathology with disruption of normal microvillus structure resulting in malabsorption and diarrhoea
a. true b. false