The immunity of some black Africans to malaria is probably due to their
A. general health.
B. cultural practices.
C. age.
D. genetic background.
D
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Penicillin-binding proteins
A. primarily function in the cell to bind to beta-lactam drugs. B. are enzymes. C. are involved in cell wall synthesis. D. inhibit non-growing bacteria. E. are enzymes AND are involved in cell wall synthesis.
What are Skeletal muscles responsible for?
What will be an ideal response?
Which of the following statements is true of signal molecules?
A) When signal molecules first bind to receptor tyrosine kinases, the receptors phosphorylate a number of nearby molecules. B) In response to some G protein-mediated signals, a special type of lipid molecule associated with the plasma membrane is cleaved to form IP3 and calcium. C) In most cases, signal molecules interact with the cell at the plasma membrane, enter the cell, and eventually enter the nucleus. D) Protein kinase A activation is one possible result of signal molecules binding to G protein-coupled receptors.
In Griffith's experiments, what happened when heat-killed S-strain bacteria were injected into a mouse along with live R-strain bacteria?
A) Proteins released from the heat-killed S-strain killed the mouse. B) DNA from the live R-strain was taken up by the heat-killed S-strain, converting them to R-strain and killing the mouse. C) DNA from the heat-killed S-strain was taken up by the live R-strain, converting them to S-strain and killing the mouse. D) RNA from the heat-killed S-strain was translated into proteins that killed the mouse.